//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 // // class day; // constexpr day& operator--() noexcept; // constexpr day operator--(int) noexcept; #include #include #include #include "test_macros.h" template constexpr bool testConstexpr() { D d1{10}; if (static_cast(--d1) != 9) return false; if (static_cast(d1--) != 9) return false; if (static_cast(d1) != 8) return false; return true; } int main() { using day = std::chrono::day; ASSERT_NOEXCEPT(--(std::declval()) ); ASSERT_NOEXCEPT( (std::declval())--); ASSERT_SAME_TYPE(day , decltype( std::declval()--)); ASSERT_SAME_TYPE(day&, decltype(--std::declval() )); static_assert(testConstexpr(), ""); for (unsigned i = 10; i <= 20; ++i) { day day(i); assert(static_cast(--day) == i - 1); assert(static_cast(day--) == i - 1); assert(static_cast(day) == i - 2); } }