boost/convert/lexical_cast.hpp

0001 // Copyright (c) 2009-2020 Vladimir Batov.
0002 // Use, modification and distribution are subject to the Boost Software License,
0003 // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
0004
0005 #ifndef BOOST_CONVERT_LEXICAL_CAST_HPP
0006 #define BOOST_CONVERT_LEXICAL_CAST_HPP
0007
0008 #include <boost/lexical_cast.hpp>
0009
0010 namespace boost { namespace cnv { struct lexical_cast; }}
0011
0012 /// @brief boost::lexical_cast-based converter
0013 /// @details The purpose of the converter is to
0014 /// * Make use of the boost::lexical_cast functionality and performance that many people have become
0015 /// accustomed to and comfortable with;
0016 /// * Demonstrate how existing independent conversion/transformation-related facilities might be
0017 //  incorporated in to the Boost.Convert framework.
0018 ///
0019 /// The converter can easily replace boost::lexical_cast, adding flexibility and convenience.
0020
0021 struct boost::cnv::lexical_cast
0022 {
0023     template<typename TypeOut, typename TypeIn>
0024     void
0025     operator()(TypeIn const& value_in, boost::optional<TypeOut>& result_out) const
0026     {
0027         try
0028         {
0029             result_out = boost::lexical_cast<TypeOut>(value_in);
0030         }
0031         catch (boost::bad_lexical_cast const&)
0032         {
0033         }
0034     }
0035 };
0036
0037 #endif // BOOST_CONVERT_LEXICAL_CAST_HPP