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25 | <div class="section"> | |
26 | <div class="titlepage"><div><div><h3 class="title"> | |
27 | <a name="boost_regex.ref.regex_iterator"></a><a class="link" href="regex_iterator.html" title="regex_iterator">regex_iterator</a> | |
28 | </h3></div></div></div> | |
29 | <p> | |
30 | The iterator type <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> will enumerate all | |
31 | of the regular expression matches found in some sequence: dereferencing a | |
32 | <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> | |
33 | yields a reference to a <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> object. | |
34 | </p> | |
35 | <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> | |
36 | <span class="keyword">class</span> <span class="identifier">charT</span> <span class="special">=</span> <span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">BidirectionalIterator</span><span class="special">>::</span><span class="identifier">value_type</span><span class="special">,</span> | |
37 | <span class="keyword">class</span> <span class="identifier">traits</span> <span class="special">=</span> <span class="identifier">regex_traits</span><span class="special"><</span><span class="identifier">charT</span><span class="special">></span> <span class="special">></span> | |
38 | <span class="keyword">class</span> <span class="identifier">regex_iterator</span> | |
39 | <span class="special">{</span> | |
40 | <span class="keyword">public</span><span class="special">:</span> | |
41 | <span class="keyword">typedef</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">></span> <span class="identifier">regex_type</span><span class="special">;</span> | |
42 | <span class="keyword">typedef</span> <span class="identifier">match_results</span><span class="special"><</span><span class="identifier">BidirectionalIterator</span><span class="special">></span> <span class="identifier">value_type</span><span class="special">;</span> | |
43 | <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">BidirectionalIterator</span><span class="special">>::</span><span class="identifier">difference_type</span> <span class="identifier">difference_type</span><span class="special">;</span> | |
44 | <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">*</span> <span class="identifier">pointer</span><span class="special">;</span> | |
45 | <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">&</span> <span class="identifier">reference</span><span class="special">;</span> | |
46 | <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">forward_iterator_tag</span> <span class="identifier">iterator_category</span><span class="special">;</span> | |
47 | ||
48 | <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.construct1">regex_iterator</a><span class="special">();</span> | |
49 | <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.construct2">regex_iterator</a><span class="special">(</span><span class="identifier">BidirectionalIterator</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">BidirectionalIterator</span> <span class="identifier">b</span><span class="special">,</span> | |
50 | <span class="keyword">const</span> <span class="identifier">regex_type</span><span class="special">&</span> <span class="identifier">re</span><span class="special">,</span> | |
51 | <span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span> | |
52 | <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.construct3">regex_iterator</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&);</span> | |
53 | <span class="identifier">regex_iterator</span><span class="special">&</span> <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.assign">operator=(</a><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&);</span> | |
54 | <span class="keyword">bool</span> <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.op_eq">operator==</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&)</span><span class="keyword">const</span><span class="special">;</span> | |
55 | <span class="keyword">bool</span> <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.op_ne">operator!=</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&)</span><span class="keyword">const</span><span class="special">;</span> | |
56 | <span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">&</span> <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.op_deref">operator*</a><span class="special">()</span><span class="keyword">const</span><span class="special">;</span> | |
57 | <span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">*</span> <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.op_arrow">operator-></a><span class="special">()</span><span class="keyword">const</span><span class="special">;</span> | |
58 | <span class="identifier">regex_iterator</span><span class="special">&</span> <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.op_inc">operator++</a><span class="special">();</span> | |
59 | <span class="identifier">regex_iterator</span> <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.op_inc2">operator++</a><span class="special">(</span><span class="keyword">int</span><span class="special">);</span> | |
60 | <span class="special">};</span> | |
61 | ||
62 | <span class="keyword">typedef</span> <span class="identifier">regex_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*></span> <span class="identifier">cregex_iterator</span><span class="special">;</span> | |
63 | <span class="keyword">typedef</span> <span class="identifier">regex_iterator</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span><span class="special">></span> <span class="identifier">sregex_iterator</span><span class="special">;</span> | |
64 | ||
65 | <span class="preprocessor">#ifndef</span> <span class="identifier">BOOST_NO_WREGEX</span> | |
66 | <span class="keyword">typedef</span> <span class="identifier">regex_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*></span> <span class="identifier">wcregex_iterator</span><span class="special">;</span> | |
67 | <span class="keyword">typedef</span> <span class="identifier">regex_iterator</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">wstring</span><span class="special">::</span><span class="identifier">const_iterator</span><span class="special">></span> <span class="identifier">wsregex_iterator</span><span class="special">;</span> | |
68 | <span class="preprocessor">#endif</span> | |
69 | ||
70 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span> <span class="identifier">regex_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*,</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">></span> | |
71 | <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.make">make_regex_iterator</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> | |
72 | <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_default</span><span class="special">);</span> | |
73 | ||
74 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ST</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">SA</span><span class="special">></span> | |
75 | <span class="identifier">regex_iterator</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>::</span><span class="identifier">const_iterator</span><span class="special">,</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">></span> | |
76 | <a class="link" href="regex_iterator.html#boost_regex.regex_iterator.make">make_regex_iterator</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>&</span> <span class="identifier">p</span><span class="special">,</span> | |
77 | <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> | |
78 | <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_default</span><span class="special">);</span> | |
79 | </pre> | |
80 | <h5> | |
81 | <a name="boost_regex.ref.regex_iterator.h0"></a> | |
82 | <span class="phrase"><a name="boost_regex.ref.regex_iterator.description"></a></span><a class="link" href="regex_iterator.html#boost_regex.ref.regex_iterator.description">Description</a> | |
83 | </h5> | |
84 | <p> | |
85 | A <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> | |
86 | is constructed from a pair of iterators, and enumerates all occurrences of | |
87 | a regular expression within that iterator range. | |
88 | </p> | |
89 | <a name="boost_regex.regex_iterator.construct1"></a><pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special">();</span> | |
90 | </pre> | |
91 | <p> | |
92 | <span class="bold"><strong>Effects</strong></span>: constructs an end of sequence | |
93 | <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>. | |
94 | </p> | |
95 | <a name="boost_regex.regex_iterator.construct2"></a><pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special">(</span><span class="identifier">BidirectionalIterator</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">BidirectionalIterator</span> <span class="identifier">b</span><span class="special">,</span> | |
96 | <span class="keyword">const</span> <span class="identifier">regex_type</span><span class="special">&</span> <span class="identifier">re</span><span class="special">,</span> | |
97 | <span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</span> <span class="identifier">match_default</span><span class="special">);</span> | |
98 | </pre> | |
99 | <p> | |
100 | <span class="bold"><strong>Effects</strong></span>: constructs a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> that will enumerate | |
101 | all occurrences of the expression <span class="emphasis"><em>re</em></span>, within the sequence | |
102 | [a,b), and found using <a class="link" href="match_flag_type.html" title="match_flag_type"><code class="computeroutput"><span class="identifier">match_flag_type</span></code></a> <span class="emphasis"><em>m</em></span>. | |
103 | The object <span class="emphasis"><em>re</em></span> must exist for the lifetime of the <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>. | |
104 | </p> | |
105 | <p> | |
106 | <span class="bold"><strong>Throws</strong></span>: <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code> | |
107 | if the complexity of matching the expression against an N character string | |
108 | begins to exceed O(N<sup>2</sup>), or if the program runs out of stack space while matching | |
109 | the expression (if Boost.Regex is configured in recursive mode), or if the | |
110 | matcher exhausts its permitted memory allocation (if Boost.Regex is configured | |
111 | in non-recursive mode). | |
112 | </p> | |
113 | <a name="boost_regex.regex_iterator.construct3"></a><pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&</span> <span class="identifier">that</span><span class="special">);</span> | |
114 | </pre> | |
115 | <p> | |
116 | <span class="bold"><strong>Effects</strong></span>: constructs a copy of <code class="computeroutput"><span class="identifier">that</span></code>. | |
117 | </p> | |
118 | <p> | |
119 | <span class="bold"><strong>Postconditions</strong></span>: <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span> <span class="special">==</span> <span class="identifier">that</span></code>. | |
120 | </p> | |
121 | <a name="boost_regex.regex_iterator.assign"></a><pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&);</span> | |
122 | </pre> | |
123 | <p> | |
124 | <span class="bold"><strong>Effects</strong></span>: sets <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> equal to those in <code class="computeroutput"><span class="identifier">that</span></code>. | |
125 | </p> | |
126 | <p> | |
127 | <span class="bold"><strong>Postconditions</strong></span>: *this == that. | |
128 | </p> | |
129 | <a name="boost_regex.regex_iterator.op_eq"></a><pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&</span> <span class="identifier">that</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span> | |
130 | </pre> | |
131 | <p> | |
132 | <span class="bold"><strong>Effects</strong></span>: returns true if *this is equal | |
133 | to that. | |
134 | </p> | |
135 | <a name="boost_regex.regex_iterator.op_ne"></a><pre class="programlisting"><span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span><span class="keyword">const</span> <span class="identifier">regex_iterator</span><span class="special">&)</span><span class="keyword">const</span><span class="special">;</span> | |
136 | </pre> | |
137 | <p> | |
138 | <span class="bold"><strong>Effects</strong></span>: returns <code class="computeroutput"><span class="special">!(*</span><span class="keyword">this</span> <span class="special">==</span> <span class="identifier">that</span><span class="special">)</span></code>. | |
139 | </p> | |
140 | <a name="boost_regex.regex_iterator.op_deref"></a><pre class="programlisting"><span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">*()</span><span class="keyword">const</span><span class="special">;</span> | |
141 | </pre> | |
142 | <p> | |
143 | <span class="bold"><strong>Effects</strong></span>: dereferencing a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> object it yields | |
144 | a const reference to a <a class="link" href="match_results.html" title="match_results"><code class="computeroutput"><span class="identifier">match_results</span></code></a> object, whose members | |
145 | are set as follows: | |
146 | </p> | |
147 | <div class="informaltable"><table class="table"> | |
148 | <colgroup> | |
149 | <col> | |
150 | <col> | |
151 | </colgroup> | |
152 | <thead><tr> | |
153 | <th> | |
154 | <p> | |
155 | Element | |
156 | </p> | |
157 | </th> | |
158 | <th> | |
159 | <p> | |
160 | Value | |
161 | </p> | |
162 | </th> | |
163 | </tr></thead> | |
164 | <tbody> | |
165 | <tr> | |
166 | <td> | |
167 | <p> | |
168 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">size</span><span class="special">()</span></code> | |
169 | </p> | |
170 | </td> | |
171 | <td> | |
172 | <p> | |
173 | <code class="computeroutput"><span class="number">1</span> <span class="special">+</span> | |
174 | <span class="identifier">re</span><span class="special">.</span><span class="identifier">mark_count</span><span class="special">()</span></code> | |
175 | </p> | |
176 | </td> | |
177 | </tr> | |
178 | <tr> | |
179 | <td> | |
180 | <p> | |
181 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">empty</span><span class="special">()</span></code> | |
182 | </p> | |
183 | </td> | |
184 | <td> | |
185 | <p> | |
186 | <code class="computeroutput"><span class="keyword">false</span></code> | |
187 | </p> | |
188 | </td> | |
189 | </tr> | |
190 | <tr> | |
191 | <td> | |
192 | <p> | |
193 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">first</span></code> | |
194 | </p> | |
195 | </td> | |
196 | <td> | |
197 | <p> | |
198 | The end of the last match found, or the start of the underlying | |
199 | sequence if this is the first match enumerated | |
200 | </p> | |
201 | </td> | |
202 | </tr> | |
203 | <tr> | |
204 | <td> | |
205 | <p> | |
206 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">last</span></code> | |
207 | </p> | |
208 | </td> | |
209 | <td> | |
210 | <p> | |
211 | The same as the start of the match found: <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="number">0</span><span class="special">].</span><span class="identifier">first</span></code> | |
212 | </p> | |
213 | </td> | |
214 | </tr> | |
215 | <tr> | |
216 | <td> | |
217 | <p> | |
218 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">matched</span></code> | |
219 | </p> | |
220 | </td> | |
221 | <td> | |
222 | <p> | |
223 | True if the prefix did not match an empty string: <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">first</span> | |
224 | <span class="special">!=</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">prefix</span><span class="special">().</span><span class="identifier">second</span></code> | |
225 | </p> | |
226 | </td> | |
227 | </tr> | |
228 | <tr> | |
229 | <td> | |
230 | <p> | |
231 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">first</span></code> | |
232 | </p> | |
233 | </td> | |
234 | <td> | |
235 | <p> | |
236 | The same as the end of the match found: <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="number">0</span><span class="special">].</span><span class="identifier">second</span></code> | |
237 | </p> | |
238 | </td> | |
239 | </tr> | |
240 | <tr> | |
241 | <td> | |
242 | <p> | |
243 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">last</span></code> | |
244 | </p> | |
245 | </td> | |
246 | <td> | |
247 | <p> | |
248 | The end of the underlying sequence. | |
249 | </p> | |
250 | </td> | |
251 | </tr> | |
252 | <tr> | |
253 | <td> | |
254 | <p> | |
255 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">matched</span></code> | |
256 | </p> | |
257 | </td> | |
258 | <td> | |
259 | <p> | |
260 | True if the suffix did not match an empty string: <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">first</span> | |
261 | <span class="special">!=</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">suffix</span><span class="special">().</span><span class="identifier">second</span></code> | |
262 | </p> | |
263 | </td> | |
264 | </tr> | |
265 | <tr> | |
266 | <td> | |
267 | <p> | |
268 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="number">0</span><span class="special">].</span><span class="identifier">first</span></code> | |
269 | </p> | |
270 | </td> | |
271 | <td> | |
272 | <p> | |
273 | The start of the sequence of characters that matched the regular | |
274 | expression | |
275 | </p> | |
276 | </td> | |
277 | </tr> | |
278 | <tr> | |
279 | <td> | |
280 | <p> | |
281 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="number">0</span><span class="special">].</span><span class="identifier">second</span></code> | |
282 | </p> | |
283 | </td> | |
284 | <td> | |
285 | <p> | |
286 | The end of the sequence of characters that matched the regular | |
287 | expression | |
288 | </p> | |
289 | </td> | |
290 | </tr> | |
291 | <tr> | |
292 | <td> | |
293 | <p> | |
294 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="number">0</span><span class="special">].</span><span class="identifier">matched</span></code> | |
295 | </p> | |
296 | </td> | |
297 | <td> | |
298 | <p> | |
299 | true if a full match was found, and false if it was a partial match | |
300 | (found as a result of the match_partial flag being set). | |
301 | </p> | |
302 | </td> | |
303 | </tr> | |
304 | <tr> | |
305 | <td> | |
306 | <p> | |
307 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="identifier">n</span><span class="special">].</span><span class="identifier">first</span></code> | |
308 | </p> | |
309 | </td> | |
310 | <td> | |
311 | <p> | |
312 | For all integers <code class="computeroutput"><span class="identifier">n</span> <span class="special"><</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">size</span><span class="special">()</span></code>, | |
313 | the start of the sequence that matched sub-expression <span class="emphasis"><em>n</em></span>. | |
314 | Alternatively, if sub-expression <span class="emphasis"><em>n</em></span> did not | |
315 | participate in the match, then last. | |
316 | </p> | |
317 | </td> | |
318 | </tr> | |
319 | <tr> | |
320 | <td> | |
321 | <p> | |
322 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="identifier">n</span><span class="special">].</span><span class="identifier">second</span></code> | |
323 | </p> | |
324 | </td> | |
325 | <td> | |
326 | <p> | |
327 | For all integers <code class="computeroutput"><span class="identifier">n</span> <span class="special"><</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">size</span><span class="special">()</span></code>, | |
328 | the end of the sequence that matched sub-expression <span class="emphasis"><em>n</em></span>. | |
329 | Alternatively, if sub-expression <span class="emphasis"><em>n</em></span> did not | |
330 | participate in the match, then last. | |
331 | </p> | |
332 | </td> | |
333 | </tr> | |
334 | <tr> | |
335 | <td> | |
336 | <p> | |
337 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">)[</span><span class="identifier">n</span><span class="special">].</span><span class="identifier">matched</span></code> | |
338 | </p> | |
339 | </td> | |
340 | <td> | |
341 | <p> | |
342 | For all integers <code class="computeroutput"><span class="identifier">n</span> <span class="special"><</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">size</span><span class="special">()</span></code>, | |
343 | true if sub-expression <span class="emphasis"><em>n</em></span> participated in the | |
344 | match, false otherwise. | |
345 | </p> | |
346 | </td> | |
347 | </tr> | |
348 | <tr> | |
349 | <td> | |
350 | <p> | |
351 | <code class="computeroutput"><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">position</span><span class="special">(</span><span class="identifier">n</span><span class="special">)</span></code> | |
352 | </p> | |
353 | </td> | |
354 | <td> | |
355 | <p> | |
356 | For all integers <code class="computeroutput"><span class="identifier">n</span> <span class="special"><</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">size</span><span class="special">()</span></code>, | |
357 | then the distance from the start of the underlying sequence to | |
358 | the start of sub-expression match <span class="emphasis"><em>n</em></span>. | |
359 | </p> | |
360 | </td> | |
361 | </tr> | |
362 | </tbody> | |
363 | </table></div> | |
364 | <a name="boost_regex.regex_iterator.op_arrow"></a><pre class="programlisting"><span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">*</span> <span class="keyword">operator</span><span class="special">->()</span><span class="keyword">const</span><span class="special">;</span> | |
365 | </pre> | |
366 | <p> | |
367 | <span class="bold"><strong>Effects</strong></span>: returns <code class="computeroutput"><span class="special">&(*</span><span class="keyword">this</span><span class="special">)</span></code>. | |
368 | </p> | |
369 | <a name="boost_regex.regex_iterator.op_inc"></a><pre class="programlisting"><span class="identifier">regex_iterator</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">++();</span> | |
370 | </pre> | |
371 | <p> | |
372 | <span class="bold"><strong>Effects</strong></span>: moves the iterator to the next | |
373 | match in the underlying sequence, or the end of sequence iterator if none | |
374 | if found. When the last match found matched a zero length string, then the | |
375 | <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> | |
376 | will find the next match as follows: if there exists a non-zero length match | |
377 | that starts at the same location as the last one, then returns it, otherwise | |
378 | starts looking for the next (possibly zero length) match from one position | |
379 | to the right of the last match. | |
380 | </p> | |
381 | <p> | |
382 | <span class="bold"><strong>Throws</strong></span>: <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span></code> | |
383 | if the complexity of matching the expression against an N character string | |
384 | begins to exceed O(N<sup>2</sup>), or if the program runs out of stack space while matching | |
385 | the expression (if Boost.Regex is configured in recursive mode), or if the | |
386 | matcher exhausts its permitted memory allocation (if Boost.Regex is configured | |
387 | in non-recursive mode). | |
388 | </p> | |
389 | <p> | |
390 | <span class="bold"><strong>Returns</strong></span>: *this. | |
391 | </p> | |
392 | <a name="boost_regex.regex_iterator.op_inc2"></a><pre class="programlisting"><span class="identifier">regex_iterator</span> <span class="keyword">operator</span><span class="special">++(</span><span class="keyword">int</span><span class="special">);</span> | |
393 | </pre> | |
394 | <p> | |
395 | <span class="bold"><strong>Effects</strong></span>: constructs a copy result of <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>, then | |
396 | calls <code class="computeroutput"><span class="special">++(*</span><span class="keyword">this</span><span class="special">)</span></code>. | |
397 | </p> | |
398 | <p> | |
399 | <span class="bold"><strong>Returns</strong></span>: result. | |
400 | </p> | |
401 | <a name="boost_regex.regex_iterator.make"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span> | |
402 | <span class="identifier">regex_iterator</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*,</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">></span> | |
403 | <span class="identifier">make_regex_iterator</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> | |
404 | <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_default</span><span class="special">);</span> | |
405 | ||
406 | <span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ST</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">SA</span><span class="special">></span> | |
407 | <span class="identifier">regex_iterator</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>::</span><span class="identifier">const_iterator</span><span class="special">,</span> <span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">></span> | |
408 | <span class="identifier">make_regex_iterator</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>&</span> <span class="identifier">p</span><span class="special">,</span> | |
409 | <span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">,</span> | |
410 | <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_default</span><span class="special">);</span> | |
411 | </pre> | |
412 | <p> | |
413 | <span class="bold"><strong>Effects</strong></span>: returns an iterator that enumerates | |
414 | all occurrences of expression <span class="emphasis"><em>e</em></span> in text <span class="emphasis"><em>p</em></span> | |
415 | using <a class="link" href="match_flag_type.html" title="match_flag_type"><code class="computeroutput"><span class="identifier">match_flag_type</span></code></a> | |
416 | <span class="emphasis"><em>m</em></span>. | |
417 | </p> | |
418 | <h5> | |
419 | <a name="boost_regex.ref.regex_iterator.h1"></a> | |
420 | <span class="phrase"><a name="boost_regex.ref.regex_iterator.examples"></a></span><a class="link" href="regex_iterator.html#boost_regex.ref.regex_iterator.examples">Examples</a> | |
421 | </h5> | |
422 | <p> | |
423 | The following example takes a C++ source file and builds up an index of class | |
424 | names, and the location of that class in the file. | |
425 | </p> | |
426 | <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> | |
427 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">map</span><span class="special">></span> | |
428 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">fstream</span><span class="special">></span> | |
429 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> | |
430 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
431 | ||
432 | <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span> | |
433 | ||
434 | <span class="comment">// purpose:</span> | |
435 | <span class="comment">// takes the contents of a file in the form of a string</span> | |
436 | <span class="comment">// and searches for all the C++ class definitions, storing</span> | |
437 | <span class="comment">// their locations in a map of strings/int's</span> | |
438 | ||
439 | <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">difference_type</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="special">></span> <span class="identifier">map_type</span><span class="special">;</span> | |
440 | ||
441 | <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">re</span> <span class="special">=</span> | |
442 | <span class="comment">// possibly leading whitespace: </span> | |
443 | <span class="string">"^[[:space:]]*"</span> | |
444 | <span class="comment">// possible template declaration:</span> | |
445 | <span class="string">"(template[[:space:]]*<[^;:{]+>[[:space:]]*)?"</span> | |
446 | <span class="comment">// class or struct:</span> | |
447 | <span class="string">"(class|struct)[[:space:]]*"</span> | |
448 | <span class="comment">// leading declspec macros etc:</span> | |
449 | <span class="string">"("</span> | |
450 | <span class="string">"\\<\\w+\\>"</span> | |
451 | <span class="string">"("</span> | |
452 | <span class="string">"[[:blank:]]*\\([^)]*\\)"</span> | |
453 | <span class="string">")?"</span> | |
454 | <span class="string">"[[:space:]]*"</span> | |
455 | <span class="string">")*"</span> | |
456 | <span class="comment">// the class name</span> | |
457 | <span class="string">"(\\<\\w*\\>)[[:space:]]*"</span> | |
458 | <span class="comment">// template specialisation parameters</span> | |
459 | <span class="string">"(<[^;:{]+>)?[[:space:]]*"</span> | |
460 | <span class="comment">// terminate in { or :</span> | |
461 | <span class="string">"(\\{|:[^;\\{()]*\\{)"</span><span class="special">;</span> | |
462 | ||
463 | ||
464 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span> <span class="identifier">expression</span><span class="special">(</span><span class="identifier">re</span><span class="special">);</span> | |
465 | <span class="identifier">map_type</span> <span class="identifier">class_index</span><span class="special">;</span> | |
466 | ||
467 | <span class="keyword">bool</span> <span class="identifier">regex_callback</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">match_results</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span><span class="special">>&</span> <span class="identifier">what</span><span class="special">)</span> | |
468 | <span class="special">{</span> | |
469 | <span class="comment">// what[0] contains the whole string</span> | |
470 | <span class="comment">// what[5] contains the class name.</span> | |
471 | <span class="comment">// what[6] contains the template specialisation if any.</span> | |
472 | <span class="comment">// add class name and position to map:</span> | |
473 | <span class="identifier">class_index</span><span class="special">[</span><span class="identifier">what</span><span class="special">[</span><span class="number">5</span><span class="special">].</span><span class="identifier">str</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">what</span><span class="special">[</span><span class="number">6</span><span class="special">].</span><span class="identifier">str</span><span class="special">()]</span> <span class="special">=</span> <span class="identifier">what</span><span class="special">.</span><span class="identifier">position</span><span class="special">(</span><span class="number">5</span><span class="special">);</span> | |
474 | <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> | |
475 | <span class="special">}</span> | |
476 | ||
477 | <span class="keyword">void</span> <span class="identifier">load_file</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&</span> <span class="identifier">is</span><span class="special">)</span> | |
478 | <span class="special">{</span> | |
479 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">erase</span><span class="special">();</span> | |
480 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">is</span><span class="special">.</span><span class="identifier">rdbuf</span><span class="special">()-></span><span class="identifier">in_avail</span><span class="special">());</span> | |
481 | <span class="keyword">char</span> <span class="identifier">c</span><span class="special">;</span> | |
482 | <span class="keyword">while</span><span class="special">(</span><span class="identifier">is</span><span class="special">.</span><span class="identifier">get</span><span class="special">(</span><span class="identifier">c</span><span class="special">))</span> | |
483 | <span class="special">{</span> | |
484 | <span class="keyword">if</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">size</span><span class="special">())</span> | |
485 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">*</span> <span class="number">3</span><span class="special">);</span> | |
486 | <span class="identifier">s</span><span class="special">.</span><span class="identifier">append</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="identifier">c</span><span class="special">);</span> | |
487 | <span class="special">}</span> | |
488 | <span class="special">}</span> | |
489 | ||
490 | <span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">**</span> <span class="identifier">argv</span><span class="special">)</span> | |
491 | <span class="special">{</span> | |
492 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">text</span><span class="special">;</span> | |
493 | <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">1</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">argc</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> | |
494 | <span class="special">{</span> | |
495 | <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Processing file "</span> <span class="special"><<</span> <span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> | |
496 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">fs</span><span class="special">(</span><span class="identifier">argv</span><span class="special">[</span><span class="identifier">i</span><span class="special">]);</span> | |
497 | <span class="identifier">load_file</span><span class="special">(</span><span class="identifier">text</span><span class="special">,</span> <span class="identifier">fs</span><span class="special">);</span> | |
498 | <span class="comment">// construct our iterators:</span> | |
499 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">sregex_iterator</span> <span class="identifier">m1</span><span class="special">(</span><span class="identifier">text</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">text</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">expression</span><span class="special">);</span> | |
500 | <span class="identifier">boost</span><span class="special">::</span><span class="identifier">sregex_iterator</span> <span class="identifier">m2</span><span class="special">;</span> | |
501 | <span class="identifier">std</span><span class="special">::</span><span class="identifier">for_each</span><span class="special">(</span><span class="identifier">m1</span><span class="special">,</span> <span class="identifier">m2</span><span class="special">,</span> <span class="special">&</span><span class="identifier">regex_callback</span><span class="special">);</span> | |
502 | <span class="comment">// copy results:</span> | |
503 | <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">class_index</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special"><<</span> <span class="string">" matches found"</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> | |
504 | <span class="identifier">map_type</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">c</span><span class="special">,</span> <span class="identifier">d</span><span class="special">;</span> | |
505 | <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">class_index</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> | |
506 | <span class="identifier">d</span> <span class="special">=</span> <span class="identifier">class_index</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> | |
507 | <span class="keyword">while</span><span class="special">(</span><span class="identifier">c</span> <span class="special">!=</span> <span class="identifier">d</span><span class="special">)</span> | |
508 | <span class="special">{</span> | |
509 | <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"class \""</span> <span class="special"><<</span> <span class="special">(*</span><span class="identifier">c</span><span class="special">).</span><span class="identifier">first</span> <span class="special"><<</span> <span class="string">"\" found at index: "</span> <span class="special"><<</span> <span class="special">(*</span><span class="identifier">c</span><span class="special">).</span><span class="identifier">second</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> | |
510 | <span class="special">++</span><span class="identifier">c</span><span class="special">;</span> | |
511 | <span class="special">}</span> | |
512 | <span class="identifier">class_index</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="identifier">class_index</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">class_index</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> | |
513 | <span class="special">}</span> | |
514 | <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> | |
515 | <span class="special">}</span> | |
516 | </pre> | |
517 | </div> | |
518 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
519 | <td align="left"></td> | |
520 | <td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> | |
521 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
522 | file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) | |
523 | </p> | |
524 | </div></td> | |
525 | </tr></table> | |
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