45 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <chrono>10 11// duration12 13// constexpr duration operator--(int); // constexpr in C++1714 15#include <chrono>16#include <cassert>17 18#include "test_macros.h"19 20#if TEST_STD_VER > 1421constexpr bool test_constexpr()22{23 std::chrono::hours h1(3);24 std::chrono::hours h2 = h1--;25 return h1.count() == 2 && h2.count() == 3;26}27#endif28 29 30int main(int, char**)31{32 {33 std::chrono::hours h1(3);34 std::chrono::hours h2 = h1--;35 assert(h1.count() == 2);36 assert(h2.count() == 3);37 }38 39#if TEST_STD_VER > 1440 static_assert(test_constexpr(), "");41#endif42 43 return 0;44}45