std::filesystem::filesystem_error::path1, std::filesystem::filesystem_error::path2

 

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技术规范

 

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

 

filesystem_error

成员函数

filesystem_error::filesystem_error

filesystem_error::operator=

filesystem_error::path1filesystem_error::path2

filesystem_error::what

继承自 std::system_error

system_error::code

 

const std::filesystem::path& path1() const noexcept;		(C++17 起)
const std::filesystem::path& path2() const noexcept;		(C++17 起)

返回存储于异常对象中的路径。

参数

（无）

返回值

到构造函数所存储的 path 参数的副本的引用。

示例

运行此代码

#include <cstdio>
#include <filesystem>
#include <iostream>
 
int main()
{
    const std::filesystem::path old_p{std::tmpnam(nullptr)},
                                new_p{std::tmpnam(nullptr)};
    try {
        std::filesystem::rename(old_p, new_p); // 因为 old_p 不存在而抛出
    }
    catch(std::filesystem::filesystem_error const& ex) {
        std::cout
            << "what():  " << ex.what() << '\n'
            << "path1(): " << ex.path1() << '\n'
            << "path2(): " << ex.path2() << '\n';
    }
}

可能的输出：

what():  filesystem error: cannot rename: No such file or directory [/tmp/fileIzzRLB] [/tmp/fileiUDWlV]
path1(): "/tmp/fileIzzRLB"
path2(): "/tmp/fileiUDWlV"