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