FM / convert

/usr/include/boost/convert

Name	Size	Mode	Actions
detail/	-	0755	rm
base.hpp	7798	0644	edit dl rm
lexical_cast.hpp	1239	0644	edit dl rm
parameters.hpp	1089	0644	edit dl rm
printf.hpp	3518	0644	edit dl rm
spirit.hpp	1801	0644	edit dl rm
stream.hpp	7710	0644	edit dl rm
strtol.hpp	9548	0644	edit dl rm

Edit: /usr/include/boost/convert/spirit.hpp (1801B)

// Copyright (c) 2009-2016 Vladimir Batov.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.

#ifndef BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP
#define BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP

#include <boost/convert/base.hpp>
#include <boost/convert/detail/config.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/karma.hpp>

namespace boost { namespace cnv
{
    struct spirit;
}}

struct boost::cnv::spirit : public boost::cnv::cnvbase<boost::cnv::spirit>
{
    typedef boost::cnv::spirit             this_type;
    typedef boost::cnv::cnvbase<this_type> base_type;

using base_type::operator();

template<typename string_type, typename out_type>
    void
    str_to(cnv::range<string_type> range, optional<out_type>& result_out) const
    {
        typedef typename cnv::range<string_type>::iterator                  iterator;
        typedef typename boost::spirit::traits::create_parser<out_type>::type parser;

iterator    beg = range.begin();
        iterator    end = range.end();
        out_type result;

if (boost::spirit::qi::parse(beg, end, parser(), result))
            if (beg == end) // ensure the whole string has been parsed
                result_out = result;
    }
    template<typename in_type, typename char_type>
    cnv::range<char_type*>
    to_str(in_type value_in, char_type* beg) const
    {
        typedef typename boost::spirit::traits::create_generator<in_type>::type generator;

char_type* end = beg;
        bool      good = boost::spirit::karma::generate(end, generator(), value_in);
        
        return cnv::range<char_type*>(beg, good ? end : beg);
    }
};

#endif // BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP

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