Struct printf

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## Struct printf

boost::cnv::printf

## Synopsis

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

    struct printf : public boost::cnv::cnvbase< boost::cnv::printf > {
      // types
      typedef boost::cnv::printf               this_type;
      typedef boost::cnv::cnvbase< this_type > base_type;

      // public member functions
      template<typename in_type>
        cnv::range< char * > to_str(in_type, char *) const;
      template<typename string_type, typename out_type>
        void str_to(cnv::range< string_type >, optional< out_type > &) const;

      // private member functions
      template<typename Type> int pos() const;
      char const * pformat(int) const;
      char const * format(int) const;
    };

## Description

### `printf` public member functions

1.     template<typename in_type>
         cnv::range< char * > to_str(in_type value_in, char * buf) const;

2.     template<typename string_type, typename out_type>
         void str_to(cnv::range< string_type > range,
                     optional< out_type > & result_out) const;

### `printf` private member functions

1.     template<typename Type> int pos() const;

2.     char const * pformat(int pos) const;

3.     char const * format(int pos) const;