test/std/utilities/meta/meta.unary/meta.unary.prop/is_signed.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

// is_signed

#include <type_traits>
#include "test_macros.h"

template <class T>
void test_is_signed()
{
    static_assert( std::is_signed<T>::value, "");
    static_assert( std::is_signed<const T>::value, "");
    static_assert( std::is_signed<volatile T>::value, "");
    static_assert( std::is_signed<const volatile T>::value, "");
#if TEST_STD_VER > 14
    static_assert( std::is_signed_v<T>, "");
    static_assert( std::is_signed_v<const T>, "");
    static_assert( std::is_signed_v<volatile T>, "");
    static_assert( std::is_signed_v<const volatile T>, "");
#endif
}

template <class T>
void test_is_not_signed()
{
    static_assert(!std::is_signed<T>::value, "");
    static_assert(!std::is_signed<const T>::value, "");
    static_assert(!std::is_signed<volatile T>::value, "");
    static_assert(!std::is_signed<const volatile T>::value, "");
#if TEST_STD_VER > 14
    static_assert(!std::is_signed_v<T>, "");
    static_assert(!std::is_signed_v<const T>, "");
    static_assert(!std::is_signed_v<volatile T>, "");
    static_assert(!std::is_signed_v<const volatile T>, "");
#endif
}

class Class
{
public:
    ~Class();
};

struct A; // incomplete

int main(int, char**)
{
    test_is_not_signed<void>();
    test_is_not_signed<int&>();
    test_is_not_signed<Class>();
    test_is_not_signed<int*>();
    test_is_not_signed<const int*>();
    test_is_not_signed<char[3]>();
    test_is_not_signed<char[]>();
    test_is_not_signed<bool>();
    test_is_not_signed<unsigned>();
    test_is_not_signed<A>();

    test_is_signed<int>();
    test_is_signed<double>();

#ifndef _LIBCPP_HAS_NO_INT128
    test_is_signed<__int128_t>();
    test_is_not_signed<__uint128_t>();
#endif

  return 0;
}