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// union
12
13#include <type_traits>
14
15#include "test_macros.h"
16
17template <class T>
18void test_union_imp()
19{
20 static_assert(!std::is_reference<T>::value, "");
21 static_assert(!std::is_arithmetic<T>::value, "");
22 static_assert(!std::is_fundamental<T>::value, "");
23 static_assert( std::is_object<T>::value, "");
24 static_assert(!std::is_scalar<T>::value, "");
25 static_assert( std::is_compound<T>::value, "");
26 static_assert(!std::is_member_pointer<T>::value, "");
27}
28
29template <class T>
30void test_union()
31{
32 test_union_imp<T>();
33 test_union_imp<const T>();
34 test_union_imp<volatile T>();
35 test_union_imp<const volatile T>();
36}
37
38union Union
39{
40 int _;
41 double __;
42};
43
44int main(int, char**)
45{
46 test_union<Union>();
47
48 return 0;
49}
50

source code of libcxx/test/std/utilities/meta/meta.unary/meta.unary.comp/union.pass.cpp