std::filesystem::path::stem

 

C++

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独立和托管

语言

标准库

标准库头文件

命名需求

功能测试宏 (C++20)

语言支持库

概念库 (C++20)

元编程库 (C++11)

诊断库

通用实用工具库

字符串库

容器库

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范围库 (C++20)

算法库

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输入/输出库

文件系统库 (C++17)

正则表达式库 (C++11)

并发支持库 (C++11)

执行支持库 (C++26)

技术规范

符号索引

外部库

 

文件系统库

类
filesystem::path filesystem::filesystem_error filesystem::directory_entry filesystem::directory_iterator filesystem::recursive_directory_iterator      filesystem::file_status	filesystem::space_info filesystem::file_type filesystem::perms filesystem::perm_options filesystem::copy_options filesystem::directory_options filesystem::file_time_type
函数
filesystem::absolute filesystem::canonicalfilesystem::weakly_canonical filesystem::relativefilesystem::proximate filesystem::copy filesystem::copy_file filesystem::copy_symlink filesystem::create_directory filesystem::create_directories filesystem::create_hard_link filesystem::create_symlink filesystem::create_directory_symlink filesystem::current_path	filesystem::exists filesystem::equivalent filesystem::file_size filesystem::hard_link_count filesystem::last_write_time filesystem::permissions filesystem::read_symlink filesystem::remove filesystem::remove_all filesystem::rename filesystem::resize_file filesystem::space filesystem::status filesystem::symlink_status filesystem::temp_directory_path
文件类型
filesystem::is_block_file filesystem::is_character_file filesystem::is_directory filesystem::is_empty filesystem::status_known	filesystem::is_fifo filesystem::is_other filesystem::is_regular_file filesystem::is_socket filesystem::is_symlink

 

std::filesystem::path

常量
path::native_formatpath::generic_formatpath::auto_format
成员函数
path::path path::~path path::operator= path::assign path::appendpath::operator/= path::concatpath::operator+= path::clear path::make_preferred path::remove_filename path::replace_filename path::replace_extension      path::swap path::compare path::beginpath::end	path::c_strpath::nativepath::operator string_type path::stringpath::u8stringpath::u16stringpath::u32stringpath::wstring path::generic_stringpath::generic_u8stringpath::generic_u16stringpath::generic_u32stringpath::generic_wstring path::lexically_normalpath::lexically_relativepath::lexically_proximate
路径分解
path::root_name path::root_directory path::root_path path::relative_path path::parent_path path::filename path::stem path::extension path::empty	path::has_root_pathpath::has_root_namepath::has_root_directorypath::has_relative_pathpath::has_parent_pathpath::has_filenamepath::has_stempath::has_extension path::is_absolutepath::is_relative
非成员函数
operator==operator!=operator<operator<=operator>operator>=operator<=> (直到 C++20)(直到 C++20)(直到 C++20)(直到 C++20)(直到 C++20)(C++20)	operator/ operator<<operator>> swap(std::filesystem::path) hash_value u8path
辅助类
hash<std::filesystem::path>
formatter<std::filesystem::path> (C++26)

 

path stem() const;		(自 C++17)

返回由通用格式路径标识的文件名，剥离其扩展名。

返回从 filename() 的开头到最后一个句点 (.) 字符（不包括最后一个句点）的子字符串，以下情况除外：

• 如果文件名中的第一个字符是句点，则忽略该句点（像“.profile”这样的文件名不被视为扩展名）。
• 如果文件名是特殊的 filesystem 组件 dot 或 dot-dot，或者如果它没有句点，则函数返回整个 filename()。

参数

(无)

返回值

由路径标识的文件名的词干（即不带最终扩展名的文件名）。

异常

可能会抛出实现定义的异常。

示例

运行此代码

#include <filesystem>
#include <iostream>
namespace fs = std::filesystem;
 
int main()
{
    for (const fs::path p : {"/foo/bar.txt", "/foo/.bar", "foo.bar.baz.tar"})
        std::cout << "path: " << p << ", stem: " << p.stem() << '\n';
 
    std::cout << '\n';
 
    for (fs::path p = "foo.bar.baz.tar"; !p.extension().empty(); p = p.stem())
        std::cout << "path: " << p << ", extension: " << p.extension() << '\n';
}

输出

path: "/foo/bar.txt", stem: "bar"
path: "/foo/.bar", stem: ".bar"
path: "foo.bar.baz.tar", stem: "foo.bar.baz"
 
path: "foo.bar.baz.tar", extension: ".tar"
path: "foo.bar.baz", extension: ".baz"
path: "foo.bar", extension: ".bar"

另请参阅

filename	返回文件名路径组件 (公共成员函数)
extension	返回文件扩展名路径组件 (公共成员函数)