libstdc++-v3/testsuite/20_util/duration/arithmetic/constexpr_c++17.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile { target c++17 } }
   3
   4 // Copyright (C) 2011-2021 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 #include <chrono>
  22 #include <testsuite_common_types.h>
  23
  24 #ifndef __cpp_lib_chrono
  25 # error "Feature-test macro for constexpr <chrono> missing"
  26 #elif __cpp_lib_chrono != 201611
  27 # error "Feature-test macro for constexpr <chrono> has wrong value"
  28 #endif
  29
  30 constexpr auto test_operators()
  31 {
  32   std::chrono::nanoseconds d1 { 1 };
  33   d1++;
  34   ++d1;
  35   d1--;
  36   --d1;
  37
  38   auto d2(d1);
  39
  40   d1+=d2;
  41   d1-=d2;
  42
  43   d1*=1;
  44   d1/=1;
  45   d1%=1;
  46   d1%=d2;
  47
  48   return d1;
  49 }
  50
  51 constexpr auto d4 = test_operators();
  52