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1 | /* Copyright 2003-2013 Joaquin M Lopez Munoz. |
2 | * Distributed under the Boost Software License, Version 1.0. | |
3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
4 | * http://www.boost.org/LICENSE_1_0.txt) | |
5 | * | |
6 | * See http://www.boost.org/libs/multi_index for library home page. | |
7 | */ | |
8 | ||
9 | #ifndef BOOST_MULTI_INDEX_DETAIL_ITER_ADAPTOR_HPP | |
10 | #define BOOST_MULTI_INDEX_DETAIL_ITER_ADAPTOR_HPP | |
11 | ||
12 | #if defined(_MSC_VER) | |
13 | #pragma once | |
14 | #endif | |
15 | ||
16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ | |
17 | #include <boost/mpl/apply.hpp> | |
18 | #include <boost/operators.hpp> | |
19 | ||
20 | namespace boost{ | |
21 | ||
22 | namespace multi_index{ | |
23 | ||
24 | namespace detail{ | |
25 | ||
26 | /* Poor man's version of boost::iterator_adaptor. Used instead of the | |
27 | * original as compile times for the latter are significantly higher. | |
28 | * The interface is not replicated exactly, only to the extent necessary | |
29 | * for internal consumption. | |
30 | */ | |
31 | ||
32 | /* NB. The purpose of the (non-inclass) global operators ==, < and - defined | |
33 | * above is to partially alleviate a problem of MSVC++ 6.0 by * which | |
34 | * friend-injected operators on T are not visible if T is instantiated only | |
35 | * in template code where T is a dependent type. | |
36 | */ | |
37 | ||
38 | class iter_adaptor_access | |
39 | { | |
40 | public: | |
41 | template<class Class> | |
42 | static typename Class::reference dereference(const Class& x) | |
43 | { | |
44 | return x.dereference(); | |
45 | } | |
46 | ||
47 | template<class Class> | |
48 | static bool equal(const Class& x,const Class& y) | |
49 | { | |
50 | return x.equal(y); | |
51 | } | |
52 | ||
53 | template<class Class> | |
54 | static void increment(Class& x) | |
55 | { | |
56 | x.increment(); | |
57 | } | |
58 | ||
59 | template<class Class> | |
60 | static void decrement(Class& x) | |
61 | { | |
62 | x.decrement(); | |
63 | } | |
64 | ||
65 | template<class Class> | |
66 | static void advance(Class& x,typename Class::difference_type n) | |
67 | { | |
68 | x.advance(n); | |
69 | } | |
70 | ||
71 | template<class Class> | |
72 | static typename Class::difference_type distance_to( | |
73 | const Class& x,const Class& y) | |
74 | { | |
75 | return x.distance_to(y); | |
76 | } | |
77 | }; | |
78 | ||
79 | template<typename Category> | |
80 | struct iter_adaptor_selector; | |
81 | ||
82 | template<class Derived,class Base> | |
83 | class forward_iter_adaptor_base: | |
84 | public forward_iterator_helper< | |
85 | Derived, | |
86 | typename Base::value_type, | |
87 | typename Base::difference_type, | |
88 | typename Base::pointer, | |
89 | typename Base::reference> | |
90 | { | |
91 | public: | |
92 | typedef typename Base::reference reference; | |
93 | ||
94 | reference operator*()const | |
95 | { | |
96 | return iter_adaptor_access::dereference(final()); | |
97 | } | |
98 | ||
99 | friend bool operator==(const Derived& x,const Derived& y) | |
100 | { | |
101 | return iter_adaptor_access::equal(x,y); | |
102 | } | |
103 | ||
104 | Derived& operator++() | |
105 | { | |
106 | iter_adaptor_access::increment(final()); | |
107 | return final(); | |
108 | } | |
109 | ||
110 | private: | |
111 | Derived& final(){return *static_cast<Derived*>(this);} | |
112 | const Derived& final()const{return *static_cast<const Derived*>(this);} | |
113 | }; | |
114 | ||
115 | template<class Derived,class Base> | |
116 | bool operator==( | |
117 | const forward_iter_adaptor_base<Derived,Base>& x, | |
118 | const forward_iter_adaptor_base<Derived,Base>& y) | |
119 | { | |
120 | return iter_adaptor_access::equal( | |
121 | static_cast<const Derived&>(x),static_cast<const Derived&>(y)); | |
122 | } | |
123 | ||
124 | template<> | |
125 | struct iter_adaptor_selector<std::forward_iterator_tag> | |
126 | { | |
127 | template<class Derived,class Base> | |
128 | struct apply | |
129 | { | |
130 | typedef forward_iter_adaptor_base<Derived,Base> type; | |
131 | }; | |
132 | }; | |
133 | ||
134 | template<class Derived,class Base> | |
135 | class bidirectional_iter_adaptor_base: | |
136 | public bidirectional_iterator_helper< | |
137 | Derived, | |
138 | typename Base::value_type, | |
139 | typename Base::difference_type, | |
140 | typename Base::pointer, | |
141 | typename Base::reference> | |
142 | { | |
143 | public: | |
144 | typedef typename Base::reference reference; | |
145 | ||
146 | reference operator*()const | |
147 | { | |
148 | return iter_adaptor_access::dereference(final()); | |
149 | } | |
150 | ||
151 | friend bool operator==(const Derived& x,const Derived& y) | |
152 | { | |
153 | return iter_adaptor_access::equal(x,y); | |
154 | } | |
155 | ||
156 | Derived& operator++() | |
157 | { | |
158 | iter_adaptor_access::increment(final()); | |
159 | return final(); | |
160 | } | |
161 | ||
162 | Derived& operator--() | |
163 | { | |
164 | iter_adaptor_access::decrement(final()); | |
165 | return final(); | |
166 | } | |
167 | ||
168 | private: | |
169 | Derived& final(){return *static_cast<Derived*>(this);} | |
170 | const Derived& final()const{return *static_cast<const Derived*>(this);} | |
171 | }; | |
172 | ||
173 | template<class Derived,class Base> | |
174 | bool operator==( | |
175 | const bidirectional_iter_adaptor_base<Derived,Base>& x, | |
176 | const bidirectional_iter_adaptor_base<Derived,Base>& y) | |
177 | { | |
178 | return iter_adaptor_access::equal( | |
179 | static_cast<const Derived&>(x),static_cast<const Derived&>(y)); | |
180 | } | |
181 | ||
182 | template<> | |
183 | struct iter_adaptor_selector<std::bidirectional_iterator_tag> | |
184 | { | |
185 | template<class Derived,class Base> | |
186 | struct apply | |
187 | { | |
188 | typedef bidirectional_iter_adaptor_base<Derived,Base> type; | |
189 | }; | |
190 | }; | |
191 | ||
192 | template<class Derived,class Base> | |
193 | class random_access_iter_adaptor_base: | |
194 | public random_access_iterator_helper< | |
195 | Derived, | |
196 | typename Base::value_type, | |
197 | typename Base::difference_type, | |
198 | typename Base::pointer, | |
199 | typename Base::reference> | |
200 | { | |
201 | public: | |
202 | typedef typename Base::reference reference; | |
203 | typedef typename Base::difference_type difference_type; | |
204 | ||
205 | reference operator*()const | |
206 | { | |
207 | return iter_adaptor_access::dereference(final()); | |
208 | } | |
209 | ||
210 | friend bool operator==(const Derived& x,const Derived& y) | |
211 | { | |
212 | return iter_adaptor_access::equal(x,y); | |
213 | } | |
214 | ||
215 | friend bool operator<(const Derived& x,const Derived& y) | |
216 | { | |
217 | return iter_adaptor_access::distance_to(x,y)>0; | |
218 | } | |
219 | ||
220 | Derived& operator++() | |
221 | { | |
222 | iter_adaptor_access::increment(final()); | |
223 | return final(); | |
224 | } | |
225 | ||
226 | Derived& operator--() | |
227 | { | |
228 | iter_adaptor_access::decrement(final()); | |
229 | return final(); | |
230 | } | |
231 | ||
232 | Derived& operator+=(difference_type n) | |
233 | { | |
234 | iter_adaptor_access::advance(final(),n); | |
235 | return final(); | |
236 | } | |
237 | ||
238 | Derived& operator-=(difference_type n) | |
239 | { | |
240 | iter_adaptor_access::advance(final(),-n); | |
241 | return final(); | |
242 | } | |
243 | ||
244 | friend difference_type operator-(const Derived& x,const Derived& y) | |
245 | { | |
246 | return iter_adaptor_access::distance_to(y,x); | |
247 | } | |
248 | ||
249 | private: | |
250 | Derived& final(){return *static_cast<Derived*>(this);} | |
251 | const Derived& final()const{return *static_cast<const Derived*>(this);} | |
252 | }; | |
253 | ||
254 | template<class Derived,class Base> | |
255 | bool operator==( | |
256 | const random_access_iter_adaptor_base<Derived,Base>& x, | |
257 | const random_access_iter_adaptor_base<Derived,Base>& y) | |
258 | { | |
259 | return iter_adaptor_access::equal( | |
260 | static_cast<const Derived&>(x),static_cast<const Derived&>(y)); | |
261 | } | |
262 | ||
263 | template<class Derived,class Base> | |
264 | bool operator<( | |
265 | const random_access_iter_adaptor_base<Derived,Base>& x, | |
266 | const random_access_iter_adaptor_base<Derived,Base>& y) | |
267 | { | |
268 | return iter_adaptor_access::distance_to( | |
269 | static_cast<const Derived&>(x),static_cast<const Derived&>(y))>0; | |
270 | } | |
271 | ||
272 | template<class Derived,class Base> | |
273 | typename random_access_iter_adaptor_base<Derived,Base>::difference_type | |
274 | operator-( | |
275 | const random_access_iter_adaptor_base<Derived,Base>& x, | |
276 | const random_access_iter_adaptor_base<Derived,Base>& y) | |
277 | { | |
278 | return iter_adaptor_access::distance_to( | |
279 | static_cast<const Derived&>(y),static_cast<const Derived&>(x)); | |
280 | } | |
281 | ||
282 | template<> | |
283 | struct iter_adaptor_selector<std::random_access_iterator_tag> | |
284 | { | |
285 | template<class Derived,class Base> | |
286 | struct apply | |
287 | { | |
288 | typedef random_access_iter_adaptor_base<Derived,Base> type; | |
289 | }; | |
290 | }; | |
291 | ||
292 | template<class Derived,class Base> | |
293 | struct iter_adaptor_base | |
294 | { | |
295 | typedef iter_adaptor_selector< | |
296 | typename Base::iterator_category> selector; | |
297 | typedef typename mpl::apply2< | |
298 | selector,Derived,Base>::type type; | |
299 | }; | |
300 | ||
301 | template<class Derived,class Base> | |
302 | class iter_adaptor:public iter_adaptor_base<Derived,Base>::type | |
303 | { | |
304 | protected: | |
305 | iter_adaptor(){} | |
306 | explicit iter_adaptor(const Base& b_):b(b_){} | |
307 | ||
308 | const Base& base_reference()const{return b;} | |
309 | Base& base_reference(){return b;} | |
310 | ||
311 | private: | |
312 | Base b; | |
313 | }; | |
314 | ||
315 | } /* namespace multi_index::detail */ | |
316 | ||
317 | } /* namespace multi_index */ | |
318 | ||
319 | } /* namespace boost */ | |
320 | ||
321 | #endif |