"use strict"; const {Fragment: _Fragment, jsx: _jsx, jsxs: _jsxs} = arguments[0]; const {useMDXComponents: _provideComponents} = arguments[0]; function _createMdxContent(props) { const _components = { a: "a", code: "code", em: "em", h2: "h2", h3: "h3", h4: "h4", h5: "h5", hr: "hr", li: "li", ol: "ol", p: "p", path: "path", pre: "pre", span: "span", strong: "strong", svg: "svg", ul: "ul", ..._provideComponents(), ...props.components }; return _jsxs(_Fragment, { children: [_jsx(_components.p, { children: "#cpp/notes/filesystem" }), "\n", _jsx(_components.p, { children: _jsx(_components.a, { href: "https://blog-bitofux.flowershow.me/assets/logo.jpeg", target: "_blank", rel: "noopener noreferrer", children: "logo.jpeg" }) }), "\n", _jsxs(_components.h2, { id: "umar_lone", children: [_jsx(_components.a, { className: "heading-link", href: "#umar_lone", children: _jsx(_components.svg, { xmlns: "http:www.w3.org/2000/svg", fill: "#ab2b65", viewBox: "0 0 20 20", className: "w-5 h-5", children: _jsx(_components.path, { fillRule: "evenodd", clipRule: "evenodd", d: "M9.493 2.853a.75.75 0 00-1.486-.205L7.545 6H4.198a.75.75 0 000 1.5h3.14l-.69 5H3.302a.75.75 0 000 1.5h3.14l-.435 3.148a.75.75 0 001.486.205L7.955 14h2.986l-.434 3.148a.75.75 0 001.486.205L12.456 14h3.346a.75.75 0 000-1.5h-3.14l.69-5h3.346a.75.75 0 000-1.5h-3.14l.435-3.147a.75.75 0 00-1.486-.205L12.045 6H9.059l.434-3.147zM8.852 7.5l-.69 5h2.986l.69-5H8.852z" }) }) }), "Umar_Lone"] }), "\n", _jsxs(_components.h3, { id: "filesystem", children: [_jsx(_components.a, { className: "heading-link", href: "#filesystem", children: _jsx(_components.svg, { xmlns: "http:www.w3.org/2000/svg", fill: "#ab2b65", viewBox: "0 0 20 20", className: "w-5 h-5", children: _jsx(_components.path, { fillRule: "evenodd", clipRule: "evenodd", d: "M9.493 2.853a.75.75 0 00-1.486-.205L7.545 6H4.198a.75.75 0 000 1.5h3.14l-.69 5H3.302a.75.75 0 000 1.5h3.14l-.435 3.148a.75.75 0 001.486.205L7.955 14h2.986l-.434 3.148a.75.75 0 001.486.205L12.456 14h3.346a.75.75 0 000-1.5h-3.14l.69-5h3.346a.75.75 0 000-1.5h-3.14l.435-3.147a.75.75 0 00-1.486-.205L12.045 6H9.059l.434-3.147zM8.852 7.5l-.69 5h2.986l.69-5H8.852z" }) }) }), "Filesystem"] }), "\n", _jsx(_components.p, { children: "filesystem是C++17新增的一个标准库组件。从Boost.Filesystem移植而来，该库根据新语言标准进行了适配调整，并与标准库的其他组件保持统一。\n它提供了文件系统中很多实用的功能：" }), "\n", _jsxs(_components.ol, { children: ["\n", _jsx(_components.li, { children: _jsx(_components.code, { className: "language-auto", children: "操作文件系统路径(核心)" }) }), "\n", _jsx(_components.li, { children: _jsx(_components.code, { className: "language-auto", children: "创建、移动、重命名、删除目录以及列出指定目录内容" }) }), "\n", _jsx(_components.li, { children: "`列出给定目录的内容" }), "\n", _jsx(_components.li, { children: _jsx(_components.code, { className: "language-auto", children: "获取路径本身或路径中文件的信息" }) }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { className: "language-auto", children: "查询或设置文件权限" }), "\n", _jsx(_components.strong, { children: "但需要注意的是文件的读写操作仍然是需要文件流中相关的类(ofstream、ifstream和fstream)" })] }), "\n"] }), "\n", _jsx(_components.hr, {}), "\n", _jsxs(_components.p, { children: ["filesystem的API通过头文件提供，并且位于", _jsx(_components.em, { children: "std::filesystem" }), "命令空间内"] }), "\n", _jsxs(_components.ul, { children: ["\n", _jsxs(_components.li, { children: [_jsx(_components.code, { className: "language-auto", children: "path:" }), "这个类类型是filesystem中最常用的组件，", _jsx(_components.em, { children: "它用于操作表示现有文件或目录的路径，它不代表任何实体,这个实体哪怕不存在也可以使用path类表示，它只是一个表示路径的类型，不是实体" })] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { className: "language-auto", children: "directory_entry:" }), "这个类类型的对象包含路径及其附加信息(文件大小、时间戳等)"] }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { className: "language-auto", children: "directory_iterator:" }), "用于遍历目录内容的迭代器"] }), "\n", _jsx(_components.li, { children: "还有一些其他的辅助函数和组件可简化文件系统操作" }), "\n"] }), "\n", _jsx(_components.p, { children: "文件系统函数通过两种机制报告错误：" }), "\n", _jsxs(_components.ol, { children: ["\n", _jsx(_components.li, { children: _jsx(_components.code, { className: "language-auto", children: "抛出std::filesystem_error异常" }) }), "\n", _jsxs(_components.li, { children: [_jsx(_components.code, { className: "language-auto", children: "返回错误码" }), "\n通常，这些可能发生错误的函数会有两个版本，这两个版本的函数是重载关系。一个版本的函数抛出一场，另外一个版本返回错误码。"] }), "\n"] }), "\n", _jsx(_components.hr, {}), "\n", _jsxs(_components.h4, { id: "path类", children: [_jsx(_components.a, { className: "heading-link", href: "#path类", children: _jsx(_components.svg, { xmlns: "http:www.w3.org/2000/svg", fill: "#ab2b65", viewBox: "0 0 20 20", className: "w-5 h-5", children: _jsx(_components.path, { fillRule: "evenodd", clipRule: "evenodd", d: "M9.493 2.853a.75.75 0 00-1.486-.205L7.545 6H4.198a.75.75 0 000 1.5h3.14l-.69 5H3.302a.75.75 0 000 1.5h3.14l-.435 3.148a.75.75 0 001.486.205L7.955 14h2.986l-.434 3.148a.75.75 0 001.486.205L12.456 14h3.346a.75.75 0 000-1.5h-3.14l.69-5h3.346a.75.75 0 000-1.5h-3.14l.435-3.147a.75.75 0 00-1.486-.205L12.045 6H9.059l.434-3.147zM8.852 7.5l-.69 5h2.986l.69-5H8.852z" }) }) }), "path类"] }), "\n", _jsx(_components.p, { children: "通过代码示例来去理解filesystem各个组件和函数之间的关系\n使用path类创建一个实例，初始化内容可以是文件系统中某个文件或目录的路径，记住是路径，一个字符串而已" }), "\n", _jsx(_components.pre, { className: "language-cpp", children: _jsxs(_components.code, { className: "language-cpp code-highlight", children: [_jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "void" }), " ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "namespace" }), " fs ", _jsx(_components.span, { className: "token operator", children: "=" }), " std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "filesystem", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" fs", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "path sel_path", _jsx(_components.span, { className: "token punctuation", children: "{" }), _jsx(_components.span, { className: "token string", children: "\"/home/parallels/bqe/data/filesystem.cc\"" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path: \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 通用格式显示 windows平台上不会显示两个\\\\\n" })] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token comment", children: " std::cout << \"sel_path.string(): \" << sel_path.string() << \"\\n\";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "int" }), " ", _jsx(_components.span, { className: "token function", children: "main" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "return" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: "输出结果示例：" }), "\n", _jsx(_components.pre, { className: "language-text", children: _jsxs(_components.code, { className: "language-text code-highlight", children: [_jsx(_components.span, { className: "code-line", children: "sel_path: \"/home/parallels/bqe/data/filesystem.cc\"\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path.string(): /home/parallels/bqe/data/filesystem.cc\n" })] }) }), "\n", _jsxs(_components.h5, { id: "获取path类信息", children: [_jsx(_components.a, { className: "heading-link", href: "#获取path类信息", children: _jsx(_components.svg, { xmlns: "http:www.w3.org/2000/svg", fill: "#ab2b65", viewBox: "0 0 20 20", className: "w-5 h-5", children: _jsx(_components.path, { fillRule: "evenodd", clipRule: "evenodd", d: "M9.493 2.853a.75.75 0 00-1.486-.205L7.545 6H4.198a.75.75 0 000 1.5h3.14l-.69 5H3.302a.75.75 0 000 1.5h3.14l-.435 3.148a.75.75 0 001.486.205L7.955 14h2.986l-.434 3.148a.75.75 0 001.486.205L12.456 14h3.346a.75.75 0 000-1.5h-3.14l.69-5h3.346a.75.75 0 000-1.5h-3.14l.435-3.147a.75.75 0 00-1.486-.205L12.045 6H9.059l.434-3.147zM8.852 7.5l-.69 5h2.986l.69-5H8.852z" }) }) }), "获取path类信息"] }), "\n", _jsx(_components.p, { children: "还可以获取路径的其他信息：path类提供获取路径各组件的方法\n比如获取根名称、根路径、根目录等信息" }), "\n", _jsx(_components.pre, { className: "language-cpp", children: _jsxs(_components.code, { className: "language-cpp code-highlight", children: [_jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "void" }), " ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "namespace" }), " fs ", _jsx(_components.span, { className: "token operator", children: "=" }), " std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "filesystem", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" fs", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "path sel_path", _jsx(_components.span, { className: "token punctuation", children: "{" }), _jsx(_components.span, { className: "token string", children: "\"/home/parallels/bqe/data/filesystem.cc\"" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path: \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path.string(): \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根名称" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_name" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root name\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_name" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根路径" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根目录" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_directory" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root directory\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_directory" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 父目录" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_parent_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"parent path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "parent_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 相对路径" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_relative_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"relative path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "relative_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 文件名称" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"filename\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_stem" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"stem part \\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "stem" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 扩展名" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_extension" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"extension\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "extension" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "int" }), " ", _jsx(_components.span, { className: "token function", children: "main" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "return" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: "输出结果：" }), "\n", _jsx(_components.pre, { className: "language-text", children: _jsxs(_components.code, { className: "language-text code-highlight", children: [_jsx(_components.span, { className: "code-line", children: "sel_path: \"/home/parallels/bqe/data/filesystem.cc\"\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path.string(): /home/parallels/bqe/data/filesystem.cc\n" }), _jsx(_components.span, { className: "code-line", children: "root path = /\n" }), _jsx(_components.span, { className: "code-line", children: "root directory = /\n" }), _jsx(_components.span, { className: "code-line", children: "parent path = /home/parallels/bqe/data\n" }), _jsx(_components.span, { className: "code-line", children: "relative path = home/parallels/bqe/data/filesystem.cc\n" }), _jsx(_components.span, { className: "code-line", children: "filename = filesystem.cc\n" }), _jsx(_components.span, { className: "code-line", children: "stem part = filesystem\n" }), _jsx(_components.span, { className: "code-line", children: "extension = .cc\n" })] }) }), "\n", _jsxs(_components.ol, { children: ["\n", _jsx(_components.li, { children: "注意，在Linux/Unix系统中,root name的名称永远为空，因为在这类系统下没有盘符的概念，它们只有一个根，那就是/。而在windows中有盘符的概念，例如C或者E等等，然后根路径就是E:\\，根目录就是\\。和类unix系统不一样的。" }), "\n", _jsx(_components.li, { children: "path类型下的成员函数relative_path是去掉根目录之后的子路径，比如/a/b/c 那么子路径就是a/b/c。与计算相对路径的relative是不一样的，relative是计算路径A相对于B的相对关系，比如/a/b/c这个路径相对于/a得到的结果就是b/c。relative(p,base)->意思就是从base出发到p的路径该如何写，模仿一下cd命令即可。要注意的是relative的两个参数必须是相对路径或者都是绝对路径，否则会抛出异常" }), "\n", _jsx(_components.li, { children: "上述的成员函数的返回类型都是path，值得注意" }), "\n", _jsx(_components.li, { children: _jsx(_components.strong, { children: "值得注意的是这目前还没操作任何目录项(实际存在的目录、文件)" }) }), "\n"] }), "\n", _jsx(_components.hr, {}), "\n", _jsxs(_components.h5, { id: "修改path类", children: [_jsx(_components.a, { className: "heading-link", href: "#修改path类", children: _jsx(_components.svg, { xmlns: "http:www.w3.org/2000/svg", fill: "#ab2b65", viewBox: "0 0 20 20", className: "w-5 h-5", children: _jsx(_components.path, { fillRule: "evenodd", clipRule: "evenodd", d: "M9.493 2.853a.75.75 0 00-1.486-.205L7.545 6H4.198a.75.75 0 000 1.5h3.14l-.69 5H3.302a.75.75 0 000 1.5h3.14l-.435 3.148a.75.75 0 001.486.205L7.955 14h2.986l-.434 3.148a.75.75 0 001.486.205L12.456 14h3.346a.75.75 0 000-1.5h-3.14l.69-5h3.346a.75.75 0 000-1.5h-3.14l.435-3.147a.75.75 0 00-1.486-.205L12.045 6H9.059l.434-3.147zM8.852 7.5l-.69 5h2.986l.69-5H8.852z" }) }) }), "修改path类"] }), "\n", _jsx(_components.p, { children: "filesystem还提供修改path对象的内容，比如上述的path对象中的内容是\"/home/parallels/bqe/data/filesystem.cc\"，你可以选择去掉后面的文件名，使这个路径对象的内容是\"/home/parallels/bqe/data/\",看一下修改之后的示例" }), "\n", _jsx(_components.pre, { className: "language-cpp", children: _jsxs(_components.code, { className: "language-cpp code-highlight", children: [_jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "void" }), " ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "namespace" }), " fs ", _jsx(_components.span, { className: "token operator", children: "=" }), " std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "filesystem", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" fs", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "path sel_path", _jsx(_components.span, { className: "token punctuation", children: "{" }), _jsx(_components.span, { className: "token string", children: "\"/home/parallels/bqe/data/filesystem.cc\"" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path: \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path.string(): \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"--------------------------after removing filename-----------------------------------\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 修改path对象，将文件名去掉" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "remove_filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path: \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path.string(): \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根名称" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_name" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root name\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_name" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根路径" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根目录" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_directory" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root directory\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_directory" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 父目录" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_parent_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"parent path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "parent_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 相对路径" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_relative_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"relative path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "relative_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 文件名称" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"filename\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_stem" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"stem part \\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "stem" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 扩展名" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_extension" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"extension\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "extension" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "int" }), " ", _jsx(_components.span, { className: "token function", children: "main" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "return" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: "查看输出信息：" }), "\n", _jsx(_components.pre, { className: "language-text", children: _jsxs(_components.code, { className: "language-text code-highlight", children: [_jsx(_components.span, { className: "code-line", children: "sel_path: \"/home/parallels/bqe/data/filesystem.cc\"\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path.string(): /home/parallels/bqe/data/filesystem.cc\n" }), _jsx(_components.span, { className: "code-line", children: "--------------------------after removing filename-----------------------------------\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path: \"/home/parallels/bqe/data/\"\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path.string(): /home/parallels/bqe/data/\n" }), _jsx(_components.span, { className: "code-line", children: "root path = /\n" }), _jsx(_components.span, { className: "code-line", children: "root directory = /\n" }), _jsx(_components.span, { className: "code-line", children: "parent path = /home/parallels/bqe/data\n" }), _jsx(_components.span, { className: "code-line", children: "relative path = home/parallels/bqe/data/\n" })] }) }), "\n", _jsx(_components.p, { children: "此时path对象的内容就只是一个简单的目录路径了，不带有文件名" }), "\n", _jsx(_components.hr, {}), "\n", _jsx(_components.p, { children: "移除文件名之后，还想在path对象中添加一个新的路径信息该如何？还是上面的示例，使用append成员函数或者直接使用/=运算符添加一个bitofux.cc，也可添加一个目录" }), "\n", _jsx(_components.pre, { className: "language-cpp", children: _jsxs(_components.code, { className: "language-cpp code-highlight", children: [_jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsxs(_components.span, { className: "token macro property", children: [_jsx(_components.span, { className: "token directive-hash", children: "#" }), _jsx(_components.span, { className: "token directive keyword", children: "include" }), " ", _jsx(_components.span, { className: "token string", children: "" })] }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "void" }), " ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "namespace" }), " fs ", _jsx(_components.span, { className: "token operator", children: "=" }), " std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "filesystem", _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" fs", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "path sel_path", _jsx(_components.span, { className: "token punctuation", children: "{" }), _jsx(_components.span, { className: "token string", children: "\"/home/parallels/bqe/data/filesystem.cc\"" }), _jsx(_components.span, { className: "token punctuation", children: "}" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path: \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path.string(): \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"--------------------------after removing filename-----------------------------------\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 修改path对象，将文件名去掉" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "remove_filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path: \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"sel_path.string(): \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 添加新的信息，比如文件名:bitofux.cc" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "append" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token string", children: "\"bitofux.cc\"" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 或者使用" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// sel_path /= \"bitofux\";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根名称" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_name" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root name\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_name" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根路径" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 根目录" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_root_directory" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"root directory\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "root_directory" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 父目录" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_parent_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"parent path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "parent_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 相对路径" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_relative_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"relative path\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "relative_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 文件名称" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"filename\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "filename" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_stem" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"stem part \\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "stem" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token comment", children: "// 扩展名" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "if" }), " ", _jsx(_components.span, { className: "token punctuation", children: "(" }), "sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "has_extension" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" std", _jsx(_components.span, { className: "token double-colon punctuation", children: "::" }), "cout ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"extension\\t = \"" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " sel_path", _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "extension" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: "." }), _jsx(_components.span, { className: "token function", children: "string" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token operator", children: "<<" }), " ", _jsx(_components.span, { className: "token string", children: "\"\\n\"" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token keyword", children: "int" }), " ", _jsx(_components.span, { className: "token function", children: "main" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), " ", _jsx(_components.span, { className: "token punctuation", children: "{" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token function", children: "using_path" }), _jsx(_components.span, { className: "token punctuation", children: "(" }), _jsx(_components.span, { className: "token punctuation", children: ")" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsx(_components.span, { className: "code-line", children: "\n" }), _jsxs(_components.span, { className: "code-line", children: [" ", _jsx(_components.span, { className: "token keyword", children: "return" }), " ", _jsx(_components.span, { className: "token number", children: "0" }), _jsx(_components.span, { className: "token punctuation", children: ";" }), "\n"] }), _jsxs(_components.span, { className: "code-line", children: [_jsx(_components.span, { className: "token punctuation", children: "}" }), "\n"] })] }) }), "\n", _jsx(_components.p, { children: "查看输出信息：" }), "\n", _jsx(_components.pre, { className: "language-text", children: _jsxs(_components.code, { className: "language-text code-highlight", children: [_jsx(_components.span, { className: "code-line", children: "sel_path: \"/home/parallels/bqe/data/filesystem.cc\"\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path.string(): /home/parallels/bqe/data/filesystem.cc\n" }), _jsx(_components.span, { className: "code-line", children: "--------------------------after removing filename-----------------------------------\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path: \"/home/parallels/bqe/data/\"\n" }), _jsx(_components.span, { className: "code-line", children: "sel_path.string(): /home/parallels/bqe/data/\n" }), _jsx(_components.span, { className: "code-line", children: "root path = /\n" }), _jsx(_components.span, { className: "code-line", children: "root directory = /\n" }), _jsx(_components.span, { className: "code-line", children: "parent path = /home/parallels/bqe/data\n" }), _jsx(_components.span, { className: "code-line", children: "relative path = home/parallels/bqe/data/bitofux.cc\n" }), _jsx(_components.span, { className: "code-line", children: "filename = bitofux.cc\n" }), _jsx(_components.span, { className: "code-line", children: "stem part = bitofux\n" }), _jsx(_components.span, { className: "code-line", children: "extension = .cc\n" })] }) }), "\n", _jsx(_components.hr, {})] }); } function MDXContent(props = {}) { const {wrapper: MDXLayout} = { ..._provideComponents(), ...props.components }; return MDXLayout ? _jsx(MDXLayout, { ...props, children: _jsx(_createMdxContent, { ...props }) }) : _createMdxContent(props); } return { default: MDXContent };