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 // static constexpr duration zero(); // noexcept after C++17 15 16 #include <chrono> 17 #include <cassert> 18 19 #include "test_macros.h" 20 #include "../../rep.h" 21 22 template <class D> 23 void test() 24 { 25 LIBCPP_ASSERT_NOEXCEPT(std::chrono::duration_values<typename D::rep>::zero()); 26 #if TEST_STD_VER > 17 27 ASSERT_NOEXCEPT( std::chrono::duration_values<typename D::rep>::zero()); 28 #endif 29 { 30 typedef typename D::rep Rep; 31 Rep zero_rep = std::chrono::duration_values<Rep>::zero(); 32 assert(D::zero().count() == zero_rep); 33 } 34 #if TEST_STD_VER >= 11 35 { 36 typedef typename D::rep Rep; 37 constexpr Rep zero_rep = std::chrono::duration_values<Rep>::zero(); 38 static_assert(D::zero().count() == zero_rep, ""); 39 } 40 #endif 41 } 42 43 int main() 44 { 45 test<std::chrono::duration<int> >(); 46 test<std::chrono::duration<Rep> >(); 47 } 48
