1 // Copyright (c) 2009-2016 Vladimir Batov. 2 // Use, modification and distribution are subject to the Boost Software License, 3 // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt. 4 5 #ifndef BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP 6 #define BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP 7 8 #include <boost/convert/base.hpp> 9 #include <boost/convert/detail/config.hpp> 10 #include <boost/spirit/include/qi.hpp> 11 #include <boost/spirit/include/karma.hpp> 12 13 namespace boost { namespace cnv 14 { 15 struct spirit; 16 }} 17 18 struct boost::cnv::spirit : public boost::cnv::cnvbase<boost::cnv::spirit> 19 { 20 typedef boost::cnv::spirit this_type; 21 typedef boost::cnv::cnvbase<this_type> base_type; 22 23 using base_type::operator(); 24 25 template<typename string_type, typename out_type> 26 void str_toboost::cnv::spirit27 str_to(cnv::range<string_type> range, optional<out_type>& result_out) const 28 { 29 typedef typename cnv::range<string_type>::iterator iterator; 30 typedef typename boost::spirit::traits::create_parser<out_type>::type parser; 31 32 iterator beg = range.begin(); 33 iterator end = range.end(); 34 out_type result; 35 36 if (boost::spirit::qi::parse(beg, end, parser(), result)) 37 if (beg == end) // ensure the whole string has been parsed 38 result_out = result; 39 } 40 template<typename in_type, typename char_type> 41 cnv::range<char_type*> to_strboost::cnv::spirit42 to_str(in_type value_in, char_type* beg) const 43 { 44 typedef typename boost::spirit::traits::create_generator<in_type>::type generator; 45 46 char_type* end = beg; 47 bool good = boost::spirit::karma::generate(end, generator(), value_in); 48 49 return cnv::range<char_type*>(beg, good ? end : beg); 50 } 51 }; 52 53 #endif // BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP 54 55