libstdc++-v3/testsuite/20_util/system_clock/1.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-time "" }
   3
   4 // Copyright (C) 2008-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // 20.8.5 Clocks [time.clock]
  22
  23 #include <chrono>
  24
  25 // 20.8.5.1 system_clock [time.clock.system]
  26 int
  27 main()
  28 {
  29   using namespace std::chrono;
  30
  31   system_clock::time_point t1 = system_clock::now();
  32   bool is_steady = system_clock::is_steady;
  33   is_steady = is_steady; // suppress unused warning
  34   std::time_t t2 = system_clock::to_time_t(t1);
  35   system_clock::time_point t3 = system_clock::from_time_t(t2);
  36   t3 = t3; // suppress unused warning
  37
  38   return 0;
  39 }