// char_converter.hh
// This file is part of libpbe; see http://anyterm.org/
// (C) 2008 Philip Endecott

// Distributed under the Boost Software License, Version 1.0:
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
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// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
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// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
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#ifndef libpbe_charset_char_converter_hh
#define libpbe_charset_char_converter_hh

#include "charset_t.hh"
#include "charset_traits.hh"
#include "char_conv.hh"
#include "error_policy.hh"


namespace pbe {

// Stateful functor for character conversion
// -----------------------------------------
//
// The function template char_conv takes state variables for the input and output,
// in case they are stateful.
// A simplified interface is provided by this functor, which keeps the state
// internally from one call to the next.

template <charset_t from_cs, charset_t to_cs, typename error_policy = default_error_policy>
class char_converter {
  typedef charset_traits<from_cs> from_traits;
  typedef charset_traits<to_cs>   to_traits;

  typename from_traits::state_t from_state;
  typename to_traits::state_t to_state;

public:
  char_conv<from_cs,to_cs,error_policy> cc;
  typename to_traits::char_t operator()(typename from_traits::char_t c) {
    return cc ( c, from_state, to_state );
  }

  // TODO flush, perhaps reset.
};

};

#endif