std::experimental::filesystem::hard_link_count
From cppreference.com
< cpplrm; | experimentallrm; | fs
| Defined in header <experimental/filesystem>
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| std::uintmax_t hard_link_count( const path& p ); std::uintmax_t hard_link_count( const path& p, error_code& ec ); |
(1) | (filesystem TS) |
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 aerror_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 (function) |