boost::urls::grammar::implementation_defined Types Name Description all_chars_t alnum_chars_t alpha_chars_t ch_delim_rule charset_ref cs_delim_rule dec_octet_rule_t digit_chars_t hexdig_chars_t not_empty_rule_t optional_rule_t range_rule_t range_rule_t<R> rule_ref squelch_rule_t token_rule_t tuple_rule_t variant_rule_t vchars_t