declval.pass.cpp revision 73d21a4f0774d3fadab98e690619a359cfb160a3 
1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. 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