filesystem/permAsString.hpp

The following code example is taken from the book
C++17 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2017
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <string>
#include <chrono>
#include <filesystem>

std::string asString(const std::filesystem::perms& pm)
{
  using perms = std::filesystem::perms;
  std::string s;
  s.resize(9);
  s[0] = (pm & perms::owner_read)   != perms::none ? 'r' : '-';
  s[1] = (pm & perms::owner_write)  != perms::none ? 'w' : '-';
  s[2] = (pm & perms::owner_exec)   != perms::none ? 'x' : '-';
  s[3] = (pm & perms::group_read)   != perms::none ? 'r' : '-';
  s[4] = (pm & perms::group_write)  != perms::none ? 'w' : '-';
  s[5] = (pm & perms::group_exec)   != perms::none ? 'x' : '-';
  s[6] = (pm & perms::others_read)  != perms::none ? 'r' : '-';
  s[7] = (pm & perms::others_write) != perms::none ? 'w' : '-';
  s[8] = (pm & perms::others_exec)  != perms::none ? 'x' : '-';
  return s;
}