libcxx/test/std/time/time.duration/time.duration.arithmetic/op_--int.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <chrono>
  10
  11 // duration
  12
  13 // constexpr duration operator--(int);   // constexpr in C++17
  14
  15 #include <chrono>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 #if TEST_STD_VER > 14
  21 constexpr bool test_constexpr()
  22 {
  23     std::chrono::hours h1(3);
  24     std::chrono::hours h2 = h1--;
  25     return h1.count() == 2 && h2.count() == 3;
  26 }
  27 #endif
  28
  29
  30 int main(int, char**)
  31 {
  32     {
  33     std::chrono::hours h1(3);
  34     std::chrono::hours h2 = h1--;
  35     assert(h1.count() == 2);
  36     assert(h2.count() == 3);
  37     }
  38
  39 #if TEST_STD_VER > 14
  40     static_assert(test_constexpr(), "");
  41 #endif
  42
  43   return 0;
  44 }