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 day& x, const days& y) noexcept; 15 // Returns: day(unsigned{x} + y.count()). 16 // 17 // constexpr day operator+(const days& x, const day& y) noexcept; 18 // Returns: y + x. 19 20 21 #include <chrono> 22 #include <type_traits> 23 #include <cassert> 24 25 #include "test_macros.h" 26 27 template <typename D, typename Ds> 28 constexpr bool testConstexpr() 29 { 30 D d{1}; 31 Ds offset{23}; 32 if (d + offset != D{24}) return false; 33 if (offset + d != D{24}) return false; 34 return true; 35 } 36 37 int main() 38 { 39 using day = std::chrono::day; 40 using days = std::chrono::days; 41 42 ASSERT_NOEXCEPT(std::declval<day>() + std::declval<days>()); 43 ASSERT_NOEXCEPT(std::declval<days>() + std::declval<day>()); 44 45 ASSERT_SAME_TYPE(day, decltype(std::declval<day>() + std::declval<days>())); 46 ASSERT_SAME_TYPE(day, decltype(std::declval<days>() + std::declval<day>())); 47 48 static_assert(testConstexpr<day, days>(), ""); 49 50 day dy{12}; 51 for (unsigned i = 0; i <= 10; ++i) 52 { 53 day d1 = dy + days{i}; 54 day d2 = days{i} + dy; 55 assert(d1 == d2); 56 assert(static_cast<unsigned>(d1) == i + 12); 57 assert(static_cast<unsigned>(d2) == i + 12); 58 } 59 } 60
