| Defined in header
<filesystem> | ||
|---|---|---|
std::uintmax_t hard_link_count( const std::filesystem::path& p ); std::uintmax_t hard_link_count( const std::filesystem::path& p, std::error_code& ec ); | (1) | (since C++17) |
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.
| p | - | path to examine |
| ec | - | out-parameter for error reporting in the non-throwing overload |
The number of hard links for p.
std::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 std::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#include <iostream>
#include <filesystem>
namespace fs = std::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';
}Possible output:
Number of hard links for current path is 2 Number of hard links for .. is 3
| (C++17)
| creates a hard link (function) |
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