plus_minus.pass.cpp (1286B)
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 noexcept; 15 // constexpr year operator-() const noexcept; 16 17 #include <chrono> 18 #include <type_traits> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 template <typename Y> 24 constexpr bool testConstexpr() 25 { 26 Y y1{1}; 27 if (static_cast<int>(+y1) != 1) return false; 28 if (static_cast<int>(-y1) != -1) return false; 29 return true; 30 } 31 32 int main() 33 { 34 using year = std::chrono::year; 35 36 ASSERT_NOEXCEPT(+std::declval<year>()); 37 ASSERT_NOEXCEPT(-std::declval<year>()); 38 39 ASSERT_SAME_TYPE(year, decltype(+std::declval<year>())); 40 ASSERT_SAME_TYPE(year, decltype(-std::declval<year>())); 41 42 static_assert(testConstexpr<year>(), ""); 43 44 for (int i = 10000; i <= 10020; ++i) 45 { 46 year year(i); 47 assert(static_cast<int>(+year) == i); 48 assert(static_cast<int>(-year) == -i); 49 } 50 }