libcxx/test/std/time/time.traits/time.traits.specializations/duration.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 // template <class Rep1, class Period1, class Rep2, class Period2>
  12 // struct common_type<chrono::duration<Rep1, Period1>, chrono::duration<Rep2, Period2>>
  13 // {
  14 //     typedef chrono::duration<typename common_type<Rep1, Rep2>::type, see below }> type;
  15 // };
  16
  17 #include <chrono>
  18 #include <ratio>
  19 #include <type_traits>
  20
  21 #include "test_macros.h"
  22
  23 template <class D1, class D2, class De>
  24 void
  25 test()
  26 {
  27     typedef typename std::common_type<D1, D2>::type Dc;
  28     static_assert((std::is_same<Dc, De>::value), "");
  29 }
  30
  31 int main(int, char**)
  32 {
  33     test<std::chrono::duration<int, std::ratio<1, 100> >,
  34          std::chrono::duration<long, std::ratio<1, 1000> >,
  35          std::chrono::duration<long, std::ratio<1, 1000> > >();
  36     test<std::chrono::duration<long, std::ratio<1, 100> >,
  37          std::chrono::duration<int, std::ratio<1, 1000> >,
  38          std::chrono::duration<long, std::ratio<1, 1000> > >();
  39     test<std::chrono::duration<char, std::ratio<1, 30> >,
  40          std::chrono::duration<short, std::ratio<1, 1000> >,
  41          std::chrono::duration<int, std::ratio<1, 3000> > >();
  42     test<std::chrono::duration<double, std::ratio<21, 1> >,
  43          std::chrono::duration<short, std::ratio<15, 1> >,
  44          std::chrono::duration<double, std::ratio<3, 1> > >();
  45
  46   return 0;
  47 }