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std::experimental::filesystem:: hard_link_count

From cppreference.net
定义于头文件 <experimental/filesystem>
std:: uintmax_t hard_link_count ( const path & p ) ;
std:: uintmax_t hard_link_count ( const path & p, error_code & ec ) ;
(1) (filesystem TS)

返回由路径 p 标识的文件系统对象的硬链接数量。

非抛出重载在出错时返回 static_cast < uintmax_t > ( - 1 )

目录

参数

p - 要检查的路径
ec - 非抛出重载中用于错误报告的输出参数

返回值

p 的硬链接数量。

异常

The overload that does not take an error_code & parameter throws filesystem_error on underlying OS API errors, constructed with p as the first argument and the OS error code as the error code argument. std:: bad_alloc may be thrown if memory allocation fails. The overload taking an error_code & parameter sets it to the OS API error code if an OS API call fails, and executes ec. clear ( ) if no errors occur. This overload has
noexcept 规范:
noexcept

示例

#include <experimental/filesystem>
#include <iostream>
namespace fs = std::experimental::filesystem;
int main()
{
    // 在POSIX风格的文件系统中,每个目录至少包含2个硬链接:
    // 目录自身和特殊成员路径名 "."
    fs::path p = fs::current_path();
    std::cout << "当前路径的硬链接数量为 "
              << fs::hard_link_count(p) << '\n';
    // 每个 ".." 都是指向父目录的硬链接,因此
    // 任意目录的硬链接总数等于 2 加上直接子目录的数量
    p = fs::current_path() / ".."; // 每个点-点都是指向父目录的硬链接
    std::cout << ".. 的硬链接数量为 "
              << fs::hard_link_count(p) << '\n';
}

输出:

Number of hard links for current path is 2
Number of hard links for .. is 3

参见

创建硬链接
(函数)