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55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
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// 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/forward.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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