isxdigit.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2020 Tobias Hienzsch
 
#ifndef TETL_CCTYPE_ISXDIGIT_HPP
#define TETL_CCTYPE_ISXDIGIT_HPP
 
namespace etl {
/// \brief Checks if the given character is a hexadecimal numeric character
/// (0123456789abcdefABCDEF).
///
/// \param ch Character to classify.
///
/// \returns Non-zero value if the character is a hexadecimal numeric character,
/// zero otherwise.
///
/// https://en.cppreference.com/w/cpp/string/byte/isxdigit
///
/// \ingroup cctype
[[nodiscard]] constexpr auto isxdigit(int ch) noexcept -> int
{
    auto const isDigit    = ch >= '0' and ch <= '9';
    auto const isHexLower = ch >= 'a' and ch <= 'f';
    auto const isHexUpper = ch >= 'A' and ch <= 'F';
 
    return static_cast<int>(isDigit or isHexLower or isHexUpper);
}
} // namespace etl
 
#endif // TETL_CCTYPE_ISXDIGIT_HPP