Chris@16: /* boost random/detail/iterator_mixin.hpp header file
Chris@16:  *
Chris@16:  * Copyright Jens Maurer 2000-2001
Chris@16:  * Distributed under the Boost Software License, Version 1.0. (See
Chris@16:  * accompanying file LICENSE_1_0.txt or copy at
Chris@16:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  *
Chris@16:  * See http://www.boost.org for most recent version including documentation.
Chris@16:  *
Chris@16:  * Revision history
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_ITERATOR_MIXIN_HPP
Chris@16: #define BOOST_ITERATOR_MIXIN_HPP
Chris@16: 
Chris@16: #include <boost/operators.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: // must be in boost namespace, otherwise the inline friend trick fails
Chris@16: template<class Generator, class ResultType>
Chris@16: class generator_iterator_mixin_adapter
Chris@16:   : incrementable<Generator>, equality_comparable<Generator>
Chris@16: {
Chris@16: public:
Chris@16:   typedef std::input_iterator_tag iterator_category;
Chris@16:   typedef ResultType value_type;
Chris@16:   typedef std::ptrdiff_t difference_type;
Chris@16:   typedef const value_type * pointer;
Chris@16:   typedef const value_type & reference;
Chris@16:   Generator& operator++() { v = cast()(); return cast(); }
Chris@16:   const value_type& operator*() const { return v; }
Chris@16: 
Chris@16: protected:
Chris@16:   // instantiate from derived classes only
Chris@16:   generator_iterator_mixin_adapter() { }
Chris@16:   void iterator_init() { operator++(); }
Chris@16: private:
Chris@16:   Generator & cast() { return static_cast<Generator&>(*this); }
Chris@16:   value_type v;
Chris@16: };
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_ITERATOR_MIXIN_HPP