daw_json_parse_digit.h

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// Copyright (c) Darrell Wright
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/beached/daw_json_link
//
 
#pragma once
 
#include "version.h"
 
#include <daw/daw_attributes.h>
 
namespace daw::json {
  inline namespace DAW_JSON_VER {
    namespace json_details {
      DAW_ATTRIB_FLATINLINE [[nodiscard]] static inline constexpr unsigned
      parse_digit( char c ) {
        return static_cast<unsigned>(
          static_cast<unsigned char>( static_cast<unsigned char>( c ) -
                                      static_cast<unsigned char>( '0' ) ) );
      }
 
      namespace parsed_constants {
        static inline constexpr unsigned decimal_char = parse_digit( '.' );
        static inline constexpr unsigned e_char = parse_digit( 'e' );
        static inline constexpr unsigned E_char = parse_digit( 'E' );
        static inline constexpr unsigned plus_char = parse_digit( '+' );
        static inline constexpr unsigned minus_char = parse_digit( '-' );
      } // namespace parsed_constants
    }   // namespace json_details
  }     // namespace DAW_JSON_VER
} // namespace daw::json