NAME¶

std::experimental::filesystem::hard_link_count - std::experimental::filesystem::hard_link_count

Synopsis¶

Defined in header <experimental/filesystem>
std::uintmax_t hard_link_count( const path& p ); (1) (filesystem TS)
std::uintmax_t hard_link_count( const path& p, error_code& ec );

Returns the number of hard links for the filesystem object identified by path p.

The non-throwing overload returns static_cast<uintmax_t>(-1) on errors.

Parameters¶

p - path to examine
ec - out-parameter for error reporting in the non-throwing overload

Return value¶

The number of hard links for p

Exceptions¶

The overload that does not take a 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 a 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 specification:
noexcept

Example¶

// Run this code

#include <iostream>
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;
int main()
{
// On a POSIX-style filesystem, each directory has at least 2 hard links:
// itself and the special member pathname "."
fs::path p = fs::current_path();
std::cout << "Number of hard links for current path is "
<< fs::hard_link_count(p) << '\n';

// each ".." is a hard link to the parent directory, so the total number
// of hard links for any directory is 2 plus number of direct subdirectories
p = fs::current_path() / ".."; // each dot-dot is a hard link to parent
std::cout << "Number of hard links for .. is "
<< fs::hard_link_count(p) << '\n';
}

Output:¶

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

See also¶

create_hard_link creates a hard link
(function)