Struct lexical_cast

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## Struct lexical_cast

boost::cnv::lexical_cast — boost::lexical_cast-based converter

## Synopsis

    // In header: <boost/convert/lexical_cast.hpp>

    struct lexical_cast {

      // public member functions
      template<typename TypeOut, typename TypeIn>
        void operator()(TypeIn const &, boost::optional< TypeOut > &) const;
    };

## Description

The purpose of the converter is to

- Make use of the boost::lexical_cast functionality and performance that many people have become accustomed to and comfortable with;

- Demonstrate how existing independent conversion/transformation-related facilities might be The converter can easily replace boost::lexical_cast, adding flexibility and convenience.

### `lexical_cast` public member functions

1.     template<typename TypeOut, typename TypeIn>
         void operator()(TypeIn const & value_in,
                         boost::optional< TypeOut > & result_out) const;