declval.pass.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976
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> typename add_rvalue_reference<T>::type declval() noexcept; 13 14#include <utility> 15#include <type_traits> 16 17class A 18{ 19 A(const A&); 20 A& operator=(const A&); 21}; 22 23int main() 24{ 25#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES 26 static_assert((std::is_same<decltype(std::declval<A>()), A&&>::value), ""); 27#else 28 static_assert((std::is_same<decltype(std::declval<A>()), A>::value), ""); 29#endif 30} 31