test/std/utilities/meta/meta.unary/meta.unary.cat/nullptr.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// type_traits

// nullptr_t
//  is_null_pointer

// UNSUPPORTED: c++98, c++03, c++11

#include <type_traits>
#include <cstddef>        // for std::nullptr_t

template <class T>
void test_nullptr_imp()
{
    static_assert(!std::is_void<T>::value, "");
    static_assert( std::is_null_pointer<T>::value, "");
    static_assert(!std::is_integral<T>::value, "");
    static_assert(!std::is_floating_point<T>::value, "");
    static_assert(!std::is_array<T>::value, "");
    static_assert(!std::is_pointer<T>::value, "");
    static_assert(!std::is_lvalue_reference<T>::value, "");
    static_assert(!std::is_rvalue_reference<T>::value, "");
    static_assert(!std::is_member_object_pointer<T>::value, "");
    static_assert(!std::is_member_function_pointer<T>::value, "");
    static_assert(!std::is_enum<T>::value, "");
    static_assert(!std::is_union<T>::value, "");
    static_assert(!std::is_class<T>::value, "");
    static_assert(!std::is_function<T>::value, "");
}

template <class T>
void test_nullptr()
{
    test_nullptr_imp<T>();
    test_nullptr_imp<const T>();
    test_nullptr_imp<volatile T>();
    test_nullptr_imp<const volatile T>();
}

struct incomplete_type;

int main(int, char**)
{
    test_nullptr<std::nullptr_t>();

//  LWG#2582
    static_assert(!std::is_null_pointer<incomplete_type>::value, "");
    return 0;
}