projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | //---------------------------------------------------------------------------// |
| 2 | // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com> | |
| 3 | // | |
| 4 | // Distributed under the Boost Software License, Version 1.0 | |
| 5 | // See accompanying file LICENSE_1_0.txt or copy at | |
| 6 | // http://www.boost.org/LICENSE_1_0.txt | |
| 7 | // | |
| 8 | // See http://boostorg.github.com/compute for more information. | |
| 9 | //---------------------------------------------------------------------------// | |
| 10 | ||
| 11 | #ifndef BOOST_COMPUTE_DETAIL_IS_CONTIGUOUS_ITERATOR_HPP | |
| 12 | #define BOOST_COMPUTE_DETAIL_IS_CONTIGUOUS_ITERATOR_HPP | |
| 13 | ||
| 14 | #include <vector> | |
| 15 | #include <valarray> | |
| 16 | ||
| 17 | #include <boost/config.hpp> | |
| 18 | #include <boost/type_traits.hpp> | |
| 19 | #include <boost/utility/enable_if.hpp> | |
| 20 | ||
| 21 | namespace boost { | |
| 22 | namespace compute { | |
| 23 | namespace detail { | |
| 24 | ||
| 25 | // default = false | |
| 26 | template<class Iterator, class Enable = void> | |
| 27 | struct _is_contiguous_iterator : public boost::false_type {}; | |
| 28 | ||
| 29 | // std::vector<T>::iterator = true | |
| 30 | template<class Iterator> | |
| 31 | struct _is_contiguous_iterator< | |
| 32 | Iterator, | |
| 33 | typename boost::enable_if< | |
| 34 | typename boost::is_same< | |
| 35 | Iterator, | |
| 36 | typename std::vector<typename Iterator::value_type>::iterator | |
| 37 | >::type | |
| 38 | >::type | |
| 39 | > : public boost::true_type {}; | |
| 40 | ||
| 41 | // std::vector<T>::const_iterator = true | |
| 42 | template<class Iterator> | |
| 43 | struct _is_contiguous_iterator< | |
| 44 | Iterator, | |
| 45 | typename boost::enable_if< | |
| 46 | typename boost::is_same< | |
| 47 | Iterator, | |
| 48 | typename std::vector<typename Iterator::value_type>::const_iterator | |
| 49 | >::type | |
| 50 | >::type | |
| 51 | > : public boost::true_type {}; | |
| 52 | ||
| 53 | // std::valarray<T>::iterator = true | |
| 54 | template<class Iterator> | |
| 55 | struct _is_contiguous_iterator< | |
| 56 | Iterator, | |
| 57 | typename boost::enable_if< | |
| 58 | typename boost::is_same< | |
| 59 | Iterator, | |
| 60 | typename std::valarray<typename Iterator::value_type>::iterator | |
| 61 | >::type | |
| 62 | >::type | |
| 63 | > : public boost::true_type {}; | |
| 64 | ||
| 65 | // std::valarray<T>::const_iterator = true | |
| 66 | template<class Iterator> | |
| 67 | struct _is_contiguous_iterator< | |
| 68 | Iterator, | |
| 69 | typename boost::enable_if< | |
| 70 | typename boost::is_same< | |
| 71 | Iterator, | |
| 72 | typename std::valarray<typename Iterator::value_type>::const_iterator | |
| 73 | >::type | |
| 74 | >::type | |
| 75 | > : public boost::true_type {}; | |
| 76 | ||
| 77 | // T* = true | |
| 78 | template<class Iterator> | |
| 79 | struct _is_contiguous_iterator< | |
| 80 | Iterator, | |
| 81 | typename boost::enable_if< | |
| 82 | boost::is_pointer<Iterator> | |
| 83 | >::type | |
| 84 | > : public boost::true_type {}; | |
| 85 | ||
| 86 | // the is_contiguous_iterator meta-function returns true if Iterator points | |
| 87 | // to a range of contiguous values. examples of contiguous iterators are | |
| 88 | // std::vector<>::iterator and float*. examples of non-contiguous iterators | |
| 89 | // are std::set<>::iterator and std::insert_iterator<>. | |
| 90 | // | |
| 91 | // the implementation consists of two phases. the first checks that value_type | |
| 92 | // for the iterator is not void. this must be done as for many containers void | |
| 93 | // is not a valid value_type (ex. std::vector<void>::iterator is not valid). | |
| 94 | // after ensuring a non-void value_type, the _is_contiguous_iterator function | |
| 95 | // is invoked. it has specializations retuning true for all (known) contiguous | |
| 96 | // iterators types and a default value of false. | |
| 97 | template<class Iterator, class Enable = void> | |
| 98 | struct is_contiguous_iterator : | |
| 99 | public _is_contiguous_iterator< | |
| 100 | typename boost::remove_cv<Iterator>::type | |
| 101 | > {}; | |
| 102 | ||
| 103 | // value_type of void = false | |
| 104 | template<class Iterator> | |
| 105 | struct is_contiguous_iterator< | |
| 106 | Iterator, | |
| 107 | typename boost::enable_if< | |
| 108 | typename boost::is_void< | |
| 109 | typename Iterator::value_type | |
| 110 | >::type | |
| 111 | >::type | |
| 112 | > : public boost::false_type {}; | |
| 113 | ||
| 114 | } // end detail namespace | |
| 115 | } // end compute namespace | |
| 116 | } // end boost namespace | |
| 117 | ||
| 118 | #endif // BOOST_COMPUTE_DETAIL_IS_CONTIGUOUS_ITERATOR_HPP |