How to use Shlwapi to find your SavedGames directory on Windows and stop using Documents\My Games in the year 2017

CMakeLists.txt

cmake_minimum_required(VERSION 3.14)
project(shlwapi-test)

add_executable(findit test.cxx)
target_compile_options(findit PRIVATE /std:c++latest)

Shlwapi.cxx

#include <Windows.h>
#include <Shlobj.h>
#include <cstdio>
#include <memory>

struct codeleter {
  constexpr codeleter () { }
  void operator () (void* ptr) const noexcept {
    CoTaskMemFree(ptr);
  }
};

auto saved_games (wchar_t** ptr) noexcept {
  return SHGetKnownFolderPath(
    FOLDERID_SavedGames,
    KF_FLAG_DEFAULT, /* Give us the full path */
    nullptr, /* access token (unnecessary for us) */
    ptr);
}

// C++17
int main () {
  wchar_t* str { };
  auto result = saved_games(&str);
  std::unique_ptr<wchar_t, codeleter> data { str };
  if (result != S_OK) {
    std::puts("Could not locate SavedGames Directory");
    std::exit(EXIT_FAILURE);
  }
  std::wprintf(L"Saved Games: %s\\", data.get());
}

// C++20
/*int main () {
  std::unique_ptr<wchar_t, codeleter> data;
  if (auto result = saved_games(std::out_ptr(data)); result != S_OK) {
    std::puts("Could not located 'Saved Games' directory");
    return EXIT_FAILURE;
  }
  std::wprintf(L"Saved Games: %s\\", data.get());
}*/