plus_minus_equal.pass.cpp (1882B)
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 years& d) noexcept; 15 // constexpr year& operator-=(const years& d) noexcept; 16 17 #include <chrono> 18 #include <type_traits> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 template <typename Y, typename Ys> 24 constexpr bool testConstexpr() 25 { 26 Y y1{1}; 27 if (static_cast<int>(y1 += Ys{ 1}) != 2) return false; 28 if (static_cast<int>(y1 += Ys{ 2}) != 4) return false; 29 if (static_cast<int>(y1 += Ys{ 8}) != 12) return false; 30 if (static_cast<int>(y1 -= Ys{ 1}) != 11) return false; 31 if (static_cast<int>(y1 -= Ys{ 2}) != 9) return false; 32 if (static_cast<int>(y1 -= Ys{ 8}) != 1) return false; 33 return true; 34 } 35 36 int main() 37 { 38 using year = std::chrono::year; 39 using years = std::chrono::years; 40 41 ASSERT_NOEXCEPT(std::declval<year&>() += std::declval<years>()); 42 ASSERT_NOEXCEPT(std::declval<year&>() -= std::declval<years>()); 43 44 ASSERT_SAME_TYPE(year&, decltype(std::declval<year&>() += std::declval<years>())); 45 ASSERT_SAME_TYPE(year&, decltype(std::declval<year&>() -= std::declval<years>())); 46 47 static_assert(testConstexpr<year, years>(), ""); 48 49 for (int i = 10000; i <= 10020; ++i) 50 { 51 year year(i); 52 assert(static_cast<int>(year += years{10}) == i + 10); 53 assert(static_cast<int>(year) == i + 10); 54 assert(static_cast<int>(year -= years{ 9}) == i + 1); 55 assert(static_cast<int>(year) == i + 1); 56 } 57 }