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// <utility> 11 12// template <class T> 13// typename conditional 14// < 15// !is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value, 16// const T&, 17// T&& 18// >::type 19// move_if_noexcept(T& x); 20 21#include <utility> 22 23class A 24{ 25 A(const A&); 26 A& operator=(const A&); 27public: 28 29 A() {} 30#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 31 A(A&&) {} 32#endif 33}; 34 35struct legacy 36{ 37 legacy() {} 38 legacy(const legacy&); 39}; 40 41int main() 42{ 43 int i = 0; 44 const int ci = 0; 45 46 legacy l; 47 A a; 48 const A ca; 49 50#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 51 static_assert((std::is_same<decltype(std::move_if_noexcept(i)), int&&>::value), ""); 52 static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int&&>::value), ""); 53 static_assert((std::is_same<decltype(std::move_if_noexcept(a)), A&&>::value), ""); 54 static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A&&>::value), ""); 55#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES 56 static_assert((std::is_same<decltype(std::move_if_noexcept(i)), const int>::value), ""); 57 static_assert((std::is_same<decltype(std::move_if_noexcept(ci)), const int>::value), ""); 58 static_assert((std::is_same<decltype(std::move_if_noexcept(a)), const A>::value), ""); 59 static_assert((std::is_same<decltype(std::move_if_noexcept(ca)), const A>::value), ""); 60#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES 61 static_assert((std::is_same<decltype(std::move_if_noexcept(l)), const legacy&>::value), ""); 62 63#if _LIBCPP_STD_VER > 11 64 constexpr int i1 = 23; 65 constexpr int i2 = std::move_if_noexcept(i1); 66 static_assert(i2 == 23, "" ); 67#endif 68 69} 70