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 // UNSUPPORTED: c++98, c++03, c++11, c++14 11 // <optional> 12 13 // constexpr optional(const optional<T>& rhs); 14 // If is_trivially_copy_constructible_v<T> is true, 15 // this constructor shall be a constexpr constructor. 16 17 #include <optional> 18 #include <type_traits> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 struct S { 24 constexpr S() : v_(0) {} 25 S(int v) : v_(v) {} 26 S(const S &rhs) : v_(rhs.v_) {} // make it not trivially copyable 27 int v_; 28 }; 29 30 31 int main() 32 { 33 static_assert (!std::is_trivially_copy_constructible_v<S>, "" ); 34 constexpr std::optional<S> o1; 35 constexpr std::optional<S> o2 = o1; // not constexpr 36 } 37
