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 year; 13 14 // constexpr year operator+(const year& x, const years& y) noexcept; 15 // Returns: year(int{x} + y.count()). 16 // 17 // constexpr year operator+(const years& x, const year& 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 Y, typename Ys> 28 constexpr bool testConstexpr() 29 { 30 Y y{1001}; 31 Ys offset{23}; 32 if (y + offset != Y{1024}) return false; 33 if (offset + y != Y{1024}) return false; 34 return true; 35 } 36 37 int main() 38 { 39 using year = std::chrono::year; 40 using years = std::chrono::years; 41 42 ASSERT_NOEXCEPT( std::declval<year>() + std::declval<years>()); 43 ASSERT_SAME_TYPE(year, decltype(std::declval<year>() + std::declval<years>())); 44 45 ASSERT_NOEXCEPT( std::declval<years>() + std::declval<year>()); 46 ASSERT_SAME_TYPE(year, decltype(std::declval<years>() + std::declval<year>())); 47 48 static_assert(testConstexpr<year, years>(), ""); 49 50 year y{1223}; 51 for (int i = 1100; i <= 1110; ++i) 52 { 53 year y1 = y + years{i}; 54 year y2 = years{i} + y; 55 assert(y1 == y2); 56 assert(static_cast<int>(y1) == i + 1223); 57 assert(static_cast<int>(y2) == i + 1223); 58 } 59 } 60
