libcxx/test/std/time/time.duration/time.duration.arithmetic/op_-.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 common_type_t<duration> operator-() const;
  14
  15 #include <chrono>
  16 #include <cassert>
  17 #include <ratio>
  18 #include <type_traits>
  19
  20 #include "test_macros.h"
  21
  22 int main(int, char**)
  23 {
  24     {
  25     const std::chrono::minutes m(3);
  26     std::chrono::minutes m2 = -m;
  27     assert(m2.count() == -m.count());
  28     }
  29 #if TEST_STD_VER >= 11
  30     {
  31     constexpr std::chrono::minutes m(3);
  32     constexpr std::chrono::minutes m2 = -m;
  33     static_assert(m2.count() == -m.count(), "");
  34     }
  35 #endif
  36
  37 // P0548
  38     {
  39     typedef std::chrono::duration<int, std::ratio<10,10> > D10;
  40     typedef std::chrono::duration<int, std::ratio< 1, 1> > D1;
  41     D10 zero(0);
  42     D10 one(1);
  43     static_assert( (std::is_same< decltype(-one), decltype(zero-one) >::value), "");
  44     static_assert( (std::is_same< decltype(zero-one), D1>::value), "");
  45     static_assert( (std::is_same< decltype(-one),     D1>::value), "");
  46     static_assert( (std::is_same< decltype(+one),     D1>::value), "");
  47     }
  48
  49   return 0;
  50 }