1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// type_traits
10
11// lvalue_ref
12
13#include <type_traits>
14
15#include "test_macros.h"
16
17template <class T>
18void test_lvalue_ref()
19{
20 static_assert(!std::is_void<T>::value, "");
21#if TEST_STD_VER > 11
22 static_assert(!std::is_null_pointer<T>::value, "");
23#endif
24 static_assert(!std::is_integral<T>::value, "");
25 static_assert(!std::is_floating_point<T>::value, "");
26 static_assert(!std::is_array<T>::value, "");
27 static_assert(!std::is_pointer<T>::value, "");
28 static_assert( std::is_lvalue_reference<T>::value, "");
29 static_assert(!std::is_rvalue_reference<T>::value, "");
30 static_assert(!std::is_member_object_pointer<T>::value, "");
31 static_assert(!std::is_member_function_pointer<T>::value, "");
32 static_assert(!std::is_enum<T>::value, "");
33 static_assert(!std::is_union<T>::value, "");
34 static_assert(!std::is_class<T>::value, "");
35 static_assert(!std::is_function<T>::value, "");
36}
37
38struct incomplete_type;
39
40int main(int, char**)
41{
42 test_lvalue_ref<int&>();
43 test_lvalue_ref<const int&>();
44
45// LWG#2582
46 static_assert(!std::is_lvalue_reference<incomplete_type>::value, "");
47
48 return 0;
49}
50

source code of libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/lvalue_ref.pass.cpp