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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_function
#include <type_traits>
#include <cstddef> // for std::nullptr_t
#include "test_macros.h"
// NOTE: On Windows the function `test_is_function<void()>` and
// `test_is_function<void() noexcept> has the same mangled despite being
// a distinct instantiation. This causes Clang to emit an error. However
// structs do not have this problem.
template <class T>
struct test_is_function {
static_assert( std::is_function<T>::value, "");
static_assert( std::is_function<const T>::value, "");
static_assert( std::is_function<volatile T>::value, "");
static_assert( std::is_function<const volatile T>::value, "");
#if TEST_STD_VER > 14
static_assert( std::is_function_v<T>, "");
static_assert( std::is_function_v<const T>, "");
static_assert( std::is_function_v<volatile T>, "");
static_assert( std::is_function_v<const volatile T>, "");
#endif
};
template <class T>
struct test_is_not_function {
static_assert(!std::is_function<T>::value, "");
static_assert(!std::is_function<const T>::value, "");
static_assert(!std::is_function<volatile T>::value, "");
static_assert(!std::is_function<const volatile T>::value, "");
#if TEST_STD_VER > 14
static_assert(!std::is_function_v<T>, "");
static_assert(!std::is_function_v<const T>, "");
static_assert(!std::is_function_v<volatile T>, "");
static_assert(!std::is_function_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};
struct incomplete_type;
typedef void (*FunctionPtr)();
int main()
{
test_is_function<void(void)>();
test_is_function<int(int)>();
test_is_function<int(int, double)>();
test_is_function<int(Abstract *)>();
test_is_function<void(...)>();
test_is_not_function<std::nullptr_t>();
test_is_not_function<void>();
test_is_not_function<int>();
test_is_not_function<int&>();
test_is_not_function<int&&>();
test_is_not_function<int*>();
test_is_not_function<double>();
test_is_not_function<char[3]>();
test_is_not_function<char[]>();
test_is_not_function<Union>();
test_is_not_function<Enum>();
test_is_not_function<FunctionPtr>(); // function pointer is not a function
test_is_not_function<Empty>();
test_is_not_function<bit_zero>();
test_is_not_function<NotEmpty>();
test_is_not_function<Abstract>();
test_is_not_function<Abstract*>();
test_is_not_function<incomplete_type>();
#if TEST_STD_VER >= 11
test_is_function<void() noexcept>();
test_is_function<void() const && noexcept>();
#endif
}
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