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// Copyright (c) 2009-2014 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/forward.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*>
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*>(beg, good ? end : beg);
}
};
#endif // BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP