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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 |