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1 | // Copyright Jim Bosch 2010-2012. |
2 | // Copyright Stefan Seefeld 2016. | |
3 | // Distributed under the Boost Software License, Version 1.0. | |
4 | // (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | #ifndef boost_python_numpy_invoke_matching_hpp_ | |
8 | #define boost_python_numpy_invoke_matching_hpp_ | |
9 | ||
10 | /** | |
11 | * @brief Template invocation based on dtype matching. | |
12 | */ | |
13 | ||
14 | #include <boost/python/numpy/dtype.hpp> | |
15 | #include <boost/python/numpy/ndarray.hpp> | |
16 | #include <boost/mpl/integral_c.hpp> | |
17 | ||
18 | namespace boost { namespace python { namespace numpy { | |
19 | namespace detail | |
20 | { | |
21 | ||
22 | struct add_pointer_meta | |
23 | { | |
24 | template <typename T> | |
25 | struct apply | |
26 | { | |
27 | typedef typename boost::add_pointer<T>::type type; | |
28 | }; | |
29 | ||
30 | }; | |
31 | ||
32 | struct dtype_template_match_found {}; | |
33 | struct nd_template_match_found {}; | |
34 | ||
35 | template <typename Function> | |
36 | struct dtype_template_invoker | |
37 | { | |
38 | ||
39 | template <typename T> | |
40 | void operator()(T *) const | |
41 | { | |
42 | if (dtype::get_builtin<T>() == m_dtype) | |
43 | { | |
44 | m_func.Function::template apply<T>(); | |
45 | throw dtype_template_match_found(); | |
46 | } | |
47 | } | |
48 | ||
49 | dtype_template_invoker(dtype const & dtype_, Function func) | |
50 | : m_dtype(dtype_), m_func(func) {} | |
51 | ||
52 | private: | |
53 | dtype const & m_dtype; | |
54 | Function m_func; | |
55 | }; | |
56 | ||
57 | template <typename Function> | |
58 | struct dtype_template_invoker< boost::reference_wrapper<Function> > | |
59 | { | |
60 | ||
61 | template <typename T> | |
62 | void operator()(T *) const | |
63 | { | |
64 | if (dtype::get_builtin<T>() == m_dtype) | |
65 | { | |
66 | m_func.Function::template apply<T>(); | |
67 | throw dtype_template_match_found(); | |
68 | } | |
69 | } | |
70 | ||
71 | dtype_template_invoker(dtype const & dtype_, Function & func) | |
72 | : m_dtype(dtype_), m_func(func) {} | |
73 | ||
74 | private: | |
75 | dtype const & m_dtype; | |
76 | Function & m_func; | |
77 | }; | |
78 | ||
79 | template <typename Function> | |
80 | struct nd_template_invoker | |
81 | { | |
82 | template <int N> | |
83 | void operator()(boost::mpl::integral_c<int,N> *) const | |
84 | { | |
85 | if (m_nd == N) | |
86 | { | |
87 | m_func.Function::template apply<N>(); | |
88 | throw nd_template_match_found(); | |
89 | } | |
90 | } | |
91 | ||
92 | nd_template_invoker(int nd, Function func) : m_nd(nd), m_func(func) {} | |
93 | ||
94 | private: | |
95 | int m_nd; | |
96 | Function m_func; | |
97 | }; | |
98 | ||
99 | template <typename Function> | |
100 | struct nd_template_invoker< boost::reference_wrapper<Function> > | |
101 | { | |
102 | template <int N> | |
103 | void operator()(boost::mpl::integral_c<int,N> *) const | |
104 | { | |
105 | if (m_nd == N) | |
106 | { | |
107 | m_func.Function::template apply<N>(); | |
108 | throw nd_template_match_found(); | |
109 | } | |
110 | } | |
111 | ||
112 | nd_template_invoker(int nd, Function & func) : m_nd(nd), m_func(func) {} | |
113 | ||
114 | private: | |
115 | int m_nd; | |
116 | Function & m_func; | |
117 | }; | |
118 | ||
119 | } // namespace boost::python::numpy::detail | |
120 | ||
121 | template <typename Sequence, typename Function> | |
122 | void invoke_matching_nd(int nd, Function f) | |
123 | { | |
124 | detail::nd_template_invoker<Function> invoker(nd, f); | |
125 | try { boost::mpl::for_each< Sequence, detail::add_pointer_meta >(invoker);} | |
126 | catch (detail::nd_template_match_found &) { return;} | |
127 | PyErr_SetString(PyExc_TypeError, "number of dimensions not found in template list."); | |
128 | python::throw_error_already_set(); | |
129 | } | |
130 | ||
131 | template <typename Sequence, typename Function> | |
132 | void invoke_matching_dtype(dtype const & dtype_, Function f) | |
133 | { | |
134 | detail::dtype_template_invoker<Function> invoker(dtype_, f); | |
135 | try { boost::mpl::for_each< Sequence, detail::add_pointer_meta >(invoker);} | |
136 | catch (detail::dtype_template_match_found &) { return;} | |
137 | PyErr_SetString(PyExc_TypeError, "dtype not found in template list."); | |
138 | python::throw_error_already_set(); | |
139 | } | |
140 | ||
141 | namespace detail | |
142 | { | |
143 | ||
144 | template <typename T, typename Function> | |
145 | struct array_template_invoker_wrapper_2 | |
146 | { | |
147 | template <int N> | |
148 | void apply() const { m_func.Function::template apply<T,N>();} | |
149 | array_template_invoker_wrapper_2(Function & func) : m_func(func) {} | |
150 | ||
151 | private: | |
152 | Function & m_func; | |
153 | }; | |
154 | ||
155 | template <typename DimSequence, typename Function> | |
156 | struct array_template_invoker_wrapper_1 | |
157 | { | |
158 | template <typename T> | |
159 | void apply() const { invoke_matching_nd<DimSequence>(m_nd, array_template_invoker_wrapper_2<T,Function>(m_func));} | |
160 | array_template_invoker_wrapper_1(int nd, Function & func) : m_nd(nd), m_func(func) {} | |
161 | ||
162 | private: | |
163 | int m_nd; | |
164 | Function & m_func; | |
165 | }; | |
166 | ||
167 | template <typename DimSequence, typename Function> | |
168 | struct array_template_invoker_wrapper_1< DimSequence, boost::reference_wrapper<Function> > | |
169 | : public array_template_invoker_wrapper_1< DimSequence, Function > | |
170 | { | |
171 | array_template_invoker_wrapper_1(int nd, Function & func) | |
172 | : array_template_invoker_wrapper_1< DimSequence, Function >(nd, func) {} | |
173 | }; | |
174 | ||
175 | } // namespace boost::python::numpy::detail | |
176 | ||
177 | template <typename TypeSequence, typename DimSequence, typename Function> | |
178 | void invoke_matching_array(ndarray const & array_, Function f) | |
179 | { | |
180 | detail::array_template_invoker_wrapper_1<DimSequence,Function> wrapper(array_.get_nd(), f); | |
181 | invoke_matching_dtype<TypeSequence>(array_.get_dtype(), wrapper); | |
182 | } | |
183 | ||
184 | }}} // namespace boost::python::numpy | |
185 | ||
186 | #endif |