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

From cppreference.net
C++
Filesystem library
Classes
Functions
File types
filesystem_error
const std:: filesystem :: path & path1 ( ) const noexcept ;
(自 C++17 起)
const std:: filesystem :: path & path2 ( ) const noexcept ;
(自 C++17 起)

返回存储在异常对象中的路径。

参数

(无)

返回值

引用构造函数存储的 path 参数副本。

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 old_p 不存在而抛出异常
    }
    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"