plus_minus_equal.pass.cpp (1899B)
1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 10 11 // <chrono> 12 // class day; 13 14 // constexpr day& operator+=(const days& d) noexcept; 15 // constexpr day& operator-=(const days& d) noexcept; 16 17 #include <chrono> 18 #include <type_traits> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 template <typename D, typename Ds> 24 constexpr bool testConstexpr() 25 { 26 D d1{1}; 27 if (static_cast<unsigned>(d1 += Ds{ 1}) != 2) return false; 28 if (static_cast<unsigned>(d1 += Ds{ 2}) != 4) return false; 29 if (static_cast<unsigned>(d1 += Ds{22}) != 26) return false; 30 if (static_cast<unsigned>(d1 -= Ds{ 1}) != 25) return false; 31 if (static_cast<unsigned>(d1 -= Ds{ 2}) != 23) return false; 32 if (static_cast<unsigned>(d1 -= Ds{22}) != 1) return false; 33 return true; 34 } 35 36 int main() 37 { 38 using day = std::chrono::day; 39 using days = std::chrono::days; 40 41 ASSERT_NOEXCEPT(std::declval<day&>() += std::declval<days>()); 42 ASSERT_NOEXCEPT(std::declval<day&>() -= std::declval<days>()); 43 44 ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() += std::declval<days>())); 45 ASSERT_SAME_TYPE(day&, decltype(std::declval<day&>() -= std::declval<days>())); 46 47 static_assert(testConstexpr<day, days>(), ""); 48 49 for (unsigned i = 0; i <= 10; ++i) 50 { 51 day day(i); 52 assert(static_cast<unsigned>(day += days{22}) == i + 22); 53 assert(static_cast<unsigned>(day) == i + 22); 54 assert(static_cast<unsigned>(day -= days{12}) == i + 10); 55 assert(static_cast<unsigned>(day) == i + 10); 56 } 57 }