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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// type_traits
// is_union
#include <type_traits>
#include <cstddef> // for std::nullptr_t
#include "test_macros.h"
template <class T>
void test_is_union()
{
static_assert( std::is_union<T>::value, "");
static_assert( std::is_union<const T>::value, "");
static_assert( std::is_union<volatile T>::value, "");
static_assert( std::is_union<const volatile T>::value, "");
#if TEST_STD_VER > 14
static_assert( std::is_union_v<T>, "");
static_assert( std::is_union_v<const T>, "");
static_assert( std::is_union_v<volatile T>, "");
static_assert( std::is_union_v<const volatile T>, "");
#endif
}
template <class T>
void test_is_not_union()
{
static_assert(!std::is_union<T>::value, "");
static_assert(!std::is_union<const T>::value, "");
static_assert(!std::is_union<volatile T>::value, "");
static_assert(!std::is_union<const volatile T>::value, "");
#if TEST_STD_VER > 14
static_assert(!std::is_union_v<T>, "");
static_assert(!std::is_union_v<const T>, "");
static_assert(!std::is_union_v<volatile T>, "");
static_assert(!std::is_union_v<const volatile T>, "");
#endif
}
class Empty
{
};
class NotEmpty
{
virtual ~NotEmpty();
};
union Union {};
struct bit_zero
{
int : 0;
};
class Abstract
{
virtual ~Abstract() = 0;
};
enum Enum {zero, one};
typedef void (*FunctionPtr)();
int main()
{
test_is_union<Union>();
test_is_not_union<std::nullptr_t>();
test_is_not_union<void>();
test_is_not_union<int>();
test_is_not_union<int&>();
test_is_not_union<int&&>();
test_is_not_union<int*>();
test_is_not_union<double>();
test_is_not_union<const int*>();
test_is_not_union<char[3]>();
test_is_not_union<char[]>();
test_is_not_union<Enum>();
test_is_not_union<FunctionPtr>();
test_is_not_union<Empty>();
test_is_not_union<bit_zero>();
test_is_not_union<NotEmpty>();
test_is_not_union<Abstract>();
}
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