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

   1 // { dg-do compile { target c++17 } }
   2
   3 // Copyright (C) 2011-2023 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <chrono>
  21 #include <testsuite_common_types.h>
  22
  23 #ifndef __cpp_lib_chrono
  24 # error "Feature-test macro for constexpr <chrono> missing"
  25 #elif __cpp_lib_chrono != 201611
  26 # error "Feature-test macro for constexpr <chrono> has wrong value"
  27 #endif
  28
  29 constexpr auto test_operators()
  30 {
  31   std::chrono::nanoseconds d1 { 1 };
  32   d1++;
  33   ++d1;
  34   d1--;
  35   --d1;
  36
  37   auto d2(d1);
  38
  39   d1+=d2;
  40   d1-=d2;
  41
  42   d1*=1;
  43   d1/=1;
  44   d1%=1;
  45   d1%=d2;
  46
  47   return d1;
  48 }
  49
  50 constexpr auto d4 = test_operators();
  51