is_pointer.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_POINTER_HPP_
#define INCLUDE_GUARD_ARENE_BASE_STDLIB_INCLUDE_STDLIB_DETAIL_IS_POINTER_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/remove_cv.hpp"
 
namespace std {
 
namespace is_pointer_detail {
 
/// @brief Base case when @c T is not a pointer
/// @tparam T The type to check
template <typename T>
extern constexpr bool is_pointer_impl = false;
 
/// @brief Case when @c T is a pointer
/// @tparam T The type to check
template <typename T>
extern constexpr bool is_pointer_impl<T*> = true;
 
}  // namespace is_pointer_detail
 
/// @brief Check if the supplied template argument is a pointer or not. The
///     value is @c true if so, @c false otherwise
/// @tparam T The type to check
template <typename T>
extern constexpr bool is_pointer_v = is_pointer_detail::is_pointer_impl<remove_cv_t<T>>;
 
/// @brief Check if the supplied template argument is a pointer or not. The
///     value is @c true if so, @c false otherwise
/// @tparam T The type to check
template <typename T>
class is_pointer : public bool_constant<is_pointer_v<T>> {};
 
}  // namespace std
 
#endif  // INCLUDE_GUARD_ARENE_BASE_STDLIB_INCLUDE_STDLIB_DETAIL_IS_POINTER_HPP_