std::filesystem::path::replace_extension

 

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文件系统库

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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
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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
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std::filesystem::path

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path::native_formatpath::generic_formatpath::auto_format
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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
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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
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swap(path)
hash_value
operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20 前)(C++20 前)(C++20 前)(C++20 前)(C++20 前)(C++20)
operator/
operator<<operator>>
u8path

 

path& replace_extension( const path& replacement = path() );		(C++17 起)

以 replacement 替换扩展名，或在使用 replacement 的默认值时移除它。

首先，若此路径拥有 extension() ，则首先从路径名的通用格式视角移除它。

然后若 replacement 非空且不以点字符开始，则添加点字符到路径名的通用格式视图。

然后如同用 operator+=(replacement) 后附 replacement 。

参数

replacement

-

要替换的扩展名

返回值

*this

异常

可能抛出实现定义的异常。

注解

replacement 的类型是 std::filesystem::path ，即使并非有意用它表示文件系统上的对象，这是为了正确认定文件系统字符编码。

示例

运行此代码

#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
 
int main()
{
    fs::path p = "/foo/bar.jpeg";
    std::cout << "Was: " << p << '\n';
    p.replace_extension(".jpg");
    std::cout << "Now: " << p << '\n';
}

输出：

Was: "/foo/bar.jpeg"
Now: "/foo/bar.jpg"

参阅

extension	返回文件扩展名路径组分 (公开成员函数)
filename	返回文件名路径组分 (公开成员函数)
stem	返回主干路径组分 (公开成员函数)
has_extension	检查对应路径元素是否非空 (公开成员函数)