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_move_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 constexpr S(const S &rhs) : v_(rhs.v_) {} // not trivially moveable 27 constexpr S(const S &&rhs) : v_(rhs.v_) {} // not trivially moveable 28 int v_; 29 }; 30 31 32 int main() 33 { 34 static_assert (!std::is_trivially_move_constructible_v<S>, "" ); 35 constexpr std::optional<S> o1; 36 constexpr std::optional<S> o2 = std::move(o1); // not constexpr 37 } 38
