is_signed.hpp

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// Copyright 2024, Toyota Motor Corporation
//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
#ifndef INCLUDE_GUARD_ARENE_BASE_STDLIB_INCLUDE_STDLIB_DETAIL_IS_SIGNED_HPP_
#define INCLUDE_GUARD_ARENE_BASE_STDLIB_INCLUDE_STDLIB_DETAIL_IS_SIGNED_HPP_
 
// parasoft-begin-suppress CERT_CPP-DCL58-a-2 "Part of a standard library implementation"
// parasoft-begin-suppress AUTOSAR-A17_6_1-a-2 "Part of a standard library implementation"
 
// IWYU pragma: private, include <type_traits>
// IWYU pragma: friend "stdlib_detail/.*"
 
#include "stdlib/include/stdlib_detail/integral_constant.hpp"
#include "stdlib/include/stdlib_detail/is_floating_point.hpp"
#include "stdlib/include/stdlib_detail/is_integral.hpp"
 
namespace std {
 
namespace is_signed_detail {
/// @brief Implementation constant for @c std::is_signed_v The value is @c true if @c Type is a signed type, @c
/// false otherwise.
/// @tparam Type The type to check
template <typename Type, bool = is_integral_v<Type> || is_floating_point_v<Type>>
extern constexpr bool is_signed_v = false;
 
/// @brief Implementation constant for @c std::is_signed_v The value is @c true if @c Type is a signed type, @c
/// false otherwise.
/// @tparam Type The type to check
template <typename Type>
extern constexpr bool is_signed_v<Type, true> =
    static_cast<Type>(static_cast<Type>(0) - static_cast<Type>(1)) < static_cast<Type>(0);
 
}  // namespace is_signed_detail
 
/// @brief A type trait to check if a type is signed. The value is @c true if @c Type is a signed type, @c false
/// otherwise.
/// @tparam Type The type to check
template <typename Type>
extern constexpr bool is_signed_v = is_signed_detail::is_signed_v<Type>;
 
/// @brief A type trait to check if a type is signed. The class is derived from @c true_type if @c Type is a signed
/// type, @c false_type otherwise.
/// @tparam Type The type to check
template <typename Type>
class is_signed : public bool_constant<is_signed_v<Type>> {};
 
}  // namespace std
 
#endif  // INCLUDE_GUARD_ARENE_BASE_STDLIB_INCLUDE_STDLIB_DETAIL_IS_SIGNED_HPP_