/* boost random/detail/iterator_mixin.hpp header file

 *

 * Copyright Jens Maurer 2000-2001

 * Distributed under the Boost Software License, Version 1.0. (See

 * accompanying file LICENSE_1_0.txt or copy at

 * http://www.boost.org/LICENSE_1_0.txt)

 *

 * See http://www.boost.org for most recent version including documentation.

 *

 * Revision history

 */

#ifndef BOOST_ITERATOR_MIXIN_HPP

#define BOOST_ITERATOR_MIXIN_HPP

#include <boost/operators.hpp>

namespace boost {

// must be in boost namespace, otherwise the inline friend trick fails

template<class Generator, class ResultType>

class generator_iterator_mixin_adapter

  : incrementable<Generator>, equality_comparable<Generator>

{

public:

  typedef std::input_iterator_tag iterator_category;

  typedef ResultType value_type;

  typedef std::ptrdiff_t difference_type;

  typedef const value_type * pointer;

  typedef const value_type & reference;

  Generator& operator++() { v = cast()(); return cast(); }

  const value_type& operator*() const { return v; }

protected:

  // instantiate from derived classes only

  generator_iterator_mixin_adapter() { }

  void iterator_init() { operator++(); }

private:

  Generator & cast() { return static_cast<Generator&>(*this); }

  value_type v;

};

} // namespace boost

#endif // BOOST_ITERATOR_MIXIN_HPP