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File: optional_rule.hpp
// // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // // Official repository: https://github.com/boostorg/url // #ifndef BOOST_URL_GRAMMAR_IMPL_OPTIONAL_RULE_HPP #define BOOST_URL_GRAMMAR_IMPL_OPTIONAL_RULE_HPP #include <boost/url/grammar/error.hpp> namespace boost { namespace urls { namespace grammar { template<class R> auto optional_rule_t<R>:: parse( char const*& it, char const* end) const -> result<value_type> { if(it == end) return boost::none; auto const it0 = it; auto rv = r_.parse(it, end); if(rv) return value_type(*rv); it = it0; return boost::none; } } // grammar } // urls } // boost #endif