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54 lines
1.8 KiB
54 lines
1.8 KiB
// Copyright (c) 2009-2016 Vladimir Batov. |
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// Use, modification and distribution are subject to the Boost Software License, |
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// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt. |
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#ifndef BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP |
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#define BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP |
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#include <boost/convert/base.hpp> |
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#include <boost/convert/detail/config.hpp> |
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#include <boost/spirit/include/qi.hpp> |
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#include <boost/spirit/include/karma.hpp> |
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namespace boost { namespace cnv |
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{ |
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struct spirit; |
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}} |
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struct boost::cnv::spirit : public boost::cnv::cnvbase<boost::cnv::spirit> |
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{ |
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typedef boost::cnv::spirit this_type; |
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typedef boost::cnv::cnvbase<this_type> base_type; |
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using base_type::operator(); |
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template<typename string_type, typename out_type> |
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void |
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str_to(cnv::range<string_type> range, optional<out_type>& result_out) const |
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{ |
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typedef typename cnv::range<string_type>::iterator iterator; |
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typedef typename boost::spirit::traits::create_parser<out_type>::type parser; |
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iterator beg = range.begin(); |
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iterator end = range.end(); |
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out_type result; |
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if (boost::spirit::qi::parse(beg, end, parser(), result)) |
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if (beg == end) // ensure the whole string has been parsed |
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result_out = result; |
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} |
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template<typename in_type, typename char_type> |
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cnv::range<char_type*> |
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to_str(in_type value_in, char_type* beg) const |
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{ |
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typedef typename boost::spirit::traits::create_generator<in_type>::type generator; |
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char_type* end = beg; |
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bool good = boost::spirit::karma::generate(end, generator(), value_in); |
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return cnv::range<char_type*>(beg, good ? end : beg); |
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} |
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}; |
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#endif // BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP |
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