std::experimental::filesystem::hard_link_count (3) - Linux Man Pages

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

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


                 creates a hard link
create_hard_link (function)