Method array_index

lesson6-Segmentation/json.hpp:11869–11892

! @param[in] s reference token to be converted into an array index @return integer representation of @a s @throw parse_error.106 if an array index begins with '0' @throw parse_error.109 if an array index begins not with a digit @throw out_of_range.404 if string @a s could not be converted to an integer @throw out_of_range.410 if an array index exceeds size_type */

    @throw out_of_range.410 if an array index exceeds size_type
    */
    static typename BasicJsonType::size_type array_index(const std::string& s)
    {
        using size_type = typename BasicJsonType::size_type;

        // error condition (cf. RFC 6901, Sect. 4)
        if (JSON_HEDLEY_UNLIKELY(s.size() > 1 && s[0] == '0'))
        {
            JSON_THROW(detail::parse_error::create(106, 0,
                                                   "array index '" + s +
                                                   "' must not begin with '0'"));
        }

        // error condition (cf. RFC 6901, Sect. 4)
        if (JSON_HEDLEY_UNLIKELY(s.size() > 1 && !(s[0] >= '1' && s[0] <= '9')))
        {
            JSON_THROW(detail::parse_error::create(109, 0, "array index '" + s + "' is not a number"));
        }

        std::size_t processed_chars = 0;
        unsigned long long res = 0;
        JSON_TRY
        {
            res = std::stoull(s, &processed_chars);
        }
        JSON_CATCH(std::out_of_range&)
        {
            JSON_THROW(detail::out_of_range::create(404, "unresolved reference token '" + s + "'"));