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 10 // <chrono> 11 12 // duration 13 14 // constexpr duration& operator--(); // constexpr in C++17 15 16 #include <chrono> 17 #include <cassert> 18 19 #include "test_macros.h" 20 21 #if TEST_STD_VER > 14 test_constexpr()22constexpr bool test_constexpr() 23 { 24 std::chrono::hours h(3); 25 return (--h).count() == 2; 26 } 27 #endif 28 main()29int main() 30 { 31 { 32 std::chrono::hours h(3); 33 std::chrono::hours& href = --h; 34 assert(&href == &h); 35 assert(h.count() == 2); 36 } 37 38 #if TEST_STD_VER > 14 39 static_assert(test_constexpr(), ""); 40 #endif 41 } 42