is_signed.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_TYPE_TRAITS_IS_SIGNED_HPP
#define TETL_TYPE_TRAITS_IS_SIGNED_HPP
 
#include <etl/_type_traits/bool_constant.hpp>
#include <etl/_type_traits/is_arithmetic.hpp>
#include <etl/_type_traits/remove_cv.hpp>
 
namespace etl {
 
namespace detail {
template <typename T>
struct is_signed : false_type { };
 
template <typename T>
    requires is_arithmetic_v<T>
struct is_signed<T> : bool_constant<T(-1) < T(0)> { };
 
} // namespace detail
 
/// \brief If T is an arithmetic type, provides the member constant value equal
/// to true if T(-1) < T(0): this results in true for the floating-point types
/// and the signed integer types, and in false for the unsigned integer types
/// and the type bool. For any other type, value is false.
template <typename T>
struct is_signed : detail::is_signed<remove_cv_t<T>>::type { };
 
template <typename T>
inline constexpr bool is_signed_v = is_signed<T>::value;
 
} // namespace etl
 
#endif // TETL_TYPE_TRAITS_IS_SIGNED_HPP