[857] | 1 | /* boost random/detail/iterator_mixin.hpp header file
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| 2 | *
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| 3 | * Copyright Jens Maurer 2000-2001
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| 4 | * Distributed under the Boost Software License, Version 1.0. (See
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| 5 | * accompanying file LICENSE_1_0.txt or copy at
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| 6 | * http://www.boost.org/LICENSE_1_0.txt)
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| 7 | *
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| 8 | * See http://www.boost.org for most recent version including documentation.
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| 9 | *
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| 10 | * Revision history
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| 11 | */
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| 12 |
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| 13 | #ifndef BOOST_ITERATOR_MIXIN_HPP
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| 14 | #define BOOST_ITERATOR_MIXIN_HPP
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| 15 |
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| 16 | #include <boost/operators.hpp>
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| 17 |
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| 18 | namespace boost {
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| 19 |
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| 20 | // must be in boost namespace, otherwise the inline friend trick fails
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| 21 | template<class Generator, class ResultType>
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| 22 | class generator_iterator_mixin_adapter
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| 23 | : incrementable<Generator>, equality_comparable<Generator>
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| 24 | {
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| 25 | public:
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| 26 | typedef std::input_iterator_tag iterator_category;
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| 27 | typedef ResultType value_type;
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| 28 | typedef std::ptrdiff_t difference_type;
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| 29 | typedef const value_type * pointer;
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| 30 | typedef const value_type & reference;
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| 31 | Generator& operator++() { v = cast()(); return cast(); }
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| 32 | const value_type& operator*() const { return v; }
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| 33 |
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| 34 | protected:
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| 35 | // instantiate from derived classes only
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| 36 | generator_iterator_mixin_adapter() { }
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| 37 | void iterator_init() { operator++(); }
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| 38 | private:
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| 39 | Generator & cast() { return static_cast<Generator&>(*this); }
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| 40 | value_type v;
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| 41 | };
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| 42 |
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| 43 | } // namespace boost
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| 44 |
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| 45 | #endif // BOOST_ITERATOR_MIXIN_HPP
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