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[platform/upstream/dldt.git] / inference-engine / thirdparty / clDNN / common / boost / 1.64.0 / include / boost-1_64 / boost / compute / iterator / function_input_iterator.hpp
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_ITERATOR_FUNCTION_INPUT_ITERATOR_HPP
12 #define BOOST_COMPUTE_ITERATOR_FUNCTION_INPUT_ITERATOR_HPP
13
14 #include <cstddef>
15 #include <iterator>
16
17 #include <boost/config.hpp>
18 #include <boost/iterator/iterator_facade.hpp>
19
20 #include <boost/compute/detail/meta_kernel.hpp>
21 #include <boost/compute/type_traits/is_device_iterator.hpp>
22 #include <boost/compute/type_traits/result_of.hpp>
23
24 namespace boost {
25 namespace compute {
26
27 // forward declaration for function_input_iterator<Function>
28 template<class Function> class function_input_iterator;
29
30 namespace detail {
31
32 // helper class which defines the iterator_facade super-class
33 // type for function_input_iterator<Function>
34 template<class Function>
35 class function_input_iterator_base
36 {
37 public:
38     typedef ::boost::iterator_facade<
39         ::boost::compute::function_input_iterator<Function>,
40         typename ::boost::compute::result_of<Function()>::type,
41         ::std::random_access_iterator_tag,
42         typename ::boost::compute::result_of<Function()>::type
43     > type;
44 };
45
46 template<class Function>
47 struct function_input_iterator_expr
48 {
49     typedef typename ::boost::compute::result_of<Function()>::type result_type;
50
51     function_input_iterator_expr(const Function &function)
52         : m_function(function)
53     {
54     }
55
56     Function m_function;
57 };
58
59 template<class Function>
60 inline meta_kernel& operator<<(meta_kernel &kernel,
61                                const function_input_iterator_expr<Function> &expr)
62 {
63     return kernel << expr.m_function();
64 }
65
66 } // end detail namespace
67
68 /// \class function_input_iterator
69 /// \brief Iterator which returns the result of a function when dereferenced
70 ///
71 /// For example:
72 ///
73 /// \snippet test/test_function_input_iterator.cpp generate_42
74 ///
75 /// \see make_function_input_iterator()
76 template<class Function>
77 class function_input_iterator :
78     public detail::function_input_iterator_base<Function>::type
79 {
80 public:
81     typedef typename detail::function_input_iterator_base<Function>::type super_type;
82     typedef typename super_type::reference reference;
83     typedef typename super_type::difference_type difference_type;
84     typedef Function function;
85
86     function_input_iterator(const Function &function, size_t index = 0)
87         : m_function(function),
88           m_index(index)
89     {
90     }
91
92     function_input_iterator(const function_input_iterator<Function> &other)
93         : m_function(other.m_function),
94           m_index(other.m_index)
95     {
96     }
97
98     function_input_iterator<Function>&
99     operator=(const function_input_iterator<Function> &other)
100     {
101         if(this != &other){
102             m_function = other.m_function;
103             m_index = other.m_index;
104         }
105
106         return *this;
107     }
108
109     ~function_input_iterator()
110     {
111     }
112
113     size_t get_index() const
114     {
115         return m_index;
116     }
117
118     template<class Expr>
119     detail::function_input_iterator_expr<Function>
120     operator[](const Expr &expr) const
121     {
122         (void) expr;
123
124         return detail::function_input_iterator_expr<Function>(m_function);
125     }
126
127 private:
128     friend class ::boost::iterator_core_access;
129
130     reference dereference() const
131     {
132         return reference();
133     }
134
135     bool equal(const function_input_iterator<Function> &other) const
136     {
137         return m_function == other.m_function && m_index == other.m_index;
138     }
139
140     void increment()
141     {
142         m_index++;
143     }
144
145     void decrement()
146     {
147         m_index--;
148     }
149
150     void advance(difference_type n)
151     {
152         m_index = static_cast<size_t>(static_cast<difference_type>(m_index) + n);
153     }
154
155     difference_type
156     distance_to(const function_input_iterator<Function> &other) const
157     {
158         return static_cast<difference_type>(other.m_index - m_index);
159     }
160
161 private:
162     Function m_function;
163     size_t m_index;
164 };
165
166 /// Returns a function_input_iterator with \p function.
167 ///
168 /// \param function function to execute when dereferenced
169 /// \param index index of the iterator
170 ///
171 /// \return a \c function_input_iterator with \p function
172 template<class Function>
173 inline function_input_iterator<Function>
174 make_function_input_iterator(const Function &function, size_t index = 0)
175 {
176     return function_input_iterator<Function>(function, index);
177 }
178
179 /// \internal_ (is_device_iterator specialization for function_input_iterator)
180 template<class Function>
181 struct is_device_iterator<function_input_iterator<Function> > : boost::true_type {};
182
183 } // end compute namespace
184 } // end boost namespace
185
186 #endif // BOOST_COMPUTE_ITERATOR_FUNCTION_INPUT_ITERATOR_HPP