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 month; 13 14 // constexpr month& operator++() noexcept; 15 // constexpr month operator++(int) noexcept; 16 17 18 #include <chrono> 19 #include <type_traits> 20 #include <cassert> 21 22 #include "test_macros.h" 23 24 template <typename M> testConstexpr()25constexpr bool testConstexpr() 26 { 27 M m1{1}; 28 if (static_cast<unsigned>(++m1) != 2) return false; 29 if (static_cast<unsigned>(m1++) != 2) return false; 30 if (static_cast<unsigned>(m1) != 3) return false; 31 return true; 32 } 33 main()34int main() 35 { 36 using month = std::chrono::month; 37 ASSERT_NOEXCEPT(++(std::declval<month&>()) ); 38 ASSERT_NOEXCEPT( (std::declval<month&>())++); 39 40 ASSERT_SAME_TYPE(month , decltype( std::declval<month&>()++)); 41 ASSERT_SAME_TYPE(month&, decltype(++std::declval<month&>() )); 42 43 static_assert(testConstexpr<month>(), ""); 44 45 for (unsigned i = 0; i <= 10; ++i) 46 { 47 month month(i); 48 assert(static_cast<unsigned>(++month) == i + 1); 49 assert(static_cast<unsigned>(month++) == i + 1); 50 assert(static_cast<unsigned>(month) == i + 2); 51 } 52 } 53