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15<h1><img src="../../../../boost.png" alt="boost.png (6897 bytes)" align=
16"middle" width="277" height="86">Boost.MultiIndex Random access indices reference</h1>
17
18<div class="prev_link"><a href="seq_indices.html"><img src="../prev.gif" alt="sequenced indices" border="0"><br>
19Sequenced indices
20</a></div>
21<div class="up_link"><a href="index.html"><img src="../up.gif" alt="Boost.MultiIndex reference" border="0"><br>
22Boost.MultiIndex reference
23</a></div>
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25Key extraction
26</a></div><br clear="all" style="clear: all;">
27
28<hr>
29
30<h2>Contents</h2>
31
32<ul>
33 <li><a href="#rnd_index_fwd_synopsis">Header
34 <code>"boost/multi_index/random_access_index_fwd.hpp"</code> synopsis</a></li>
35 <li><a href="#synopsis">Header
36 <code>"boost/multi_index/random_access_index.hpp"</code> synopsis</a>
37 <ul>
38 <li><a href="#random_access"><code>random_access</code> index specifier</a></li>
39 <li><a href="#rnd_indices">Random access indices</a>
40 <ul>
41 <li><a href="#complexity_signature">Complexity signature</a></li>
42 <li><a href="#instantiation_types">Instantiation types</a></li>
43 <li><a href="#constructors">Constructors, copy and assignment</a></li>
44 <li><a href="#iterators">Iterators</a></li>
45 <li><a href="#capacity">Capacity operations</a></li>
46 <li><a href="#modifiers">Modifiers</a></li>
47 <li><a href="#list_operations">List operations</a></li>
48 <li><a href="#rearrange_operations">Rearrange operations</a></li>
49 <li><a href="#serialization">Serialization</a></li>
50 </ul>
51 </li>
52 </ul>
53 </li>
54</ul>
55
56<h2>
57<a name="rnd_index_fwd_synopsis">Header
58<a href="../../../../boost/multi_index/random_access_index_fwd.hpp">
59<code>"boost/multi_index/random_access_index_fwd.hpp"</code></a> synopsis</a></h2>
60
61<blockquote><pre>
62<span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span>
63
64<span class=keyword>namespace</span> <span class=identifier>multi_index</span><span class=special>{</span>
65
66<span class=comment>// random_access index specifier</span>
67
68<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>TagList</span><span class=special>=</span><span class=identifier>tag</span><span class=special>&lt;&gt;</span> <span class=special>&gt;</span> <span class=keyword>struct</span> <span class=identifier>random_access</span><span class=special>;</span>
69
70<span class=comment>// indices</span>
71
72<span class=keyword>namespace</span> <span class=identifier>detail</span><span class=special>{</span>
73
74<span class=keyword>template</span><span class=special>&lt;</span><b>implementation defined</b><span class=special>&gt;</span> <span class=keyword>class</span> <b>index class name implementation defined</b><span class=special>;</span>
75
76<span class=special>}</span> <span class=comment>// namespace boost::multi_index::detail</span>
77
78<span class=special>}</span> <span class=comment>// namespace boost::multi_index</span>
79
80<span class=special>}</span> <span class=comment>// namespace boost</span>
81</pre></blockquote>
82
83<p>
84<code>random_access_index_fwd.hpp</code> provides forward declarations for the
85<a href="#random_access"><code>random_access</code></a> index specifier and
86its associated <a href="#rnd_indices">random access index</a> class.
87</p>
88
89<h2>
90<a name="synopsis">Header
91<a href="../../../../boost/multi_index/random_access_index.hpp">
92<code>"boost/multi_index/random_access_index.hpp"</code></a> synopsis</a></h2>
93
94<blockquote><pre>
95<span class=preprocessor>#include</span> <span class=special>&lt;</span><span class=identifier>initializer_list</span><span class=special>&gt;</span>
96
97<span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span>
98
99<span class=keyword>namespace</span> <span class=identifier>multi_index</span><span class=special>{</span>
100
101<span class=comment>// random_access index specifier</span>
102
103<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>TagList</span><span class=special>=</span><span class=identifier>tag</span><span class=special>&lt;&gt;</span> <span class=special>&gt;</span> <span class=keyword>struct</span> <span class=identifier>random_access</span><span class=special>;</span>
104
105<span class=comment>// indices</span>
106
107<span class=keyword>namespace</span> <span class=identifier>detail</span><span class=special>{</span>
108
109<span class=keyword>template</span><span class=special>&lt;</span><b>implementation defined</b><span class=special>&gt;</span> <span class=keyword>class</span> <b>index class name implementation defined</b><span class=special>;</span>
110
111<span class=comment>// index comparison:</span>
112
113<span class=comment>// <b>OP</b> is any of ==,&lt;,!=,&gt;,&gt;=,&lt;=</span>
114
115<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
116<span class=keyword>bool</span> <span class=keyword>operator</span> <b><i>OP</i></b><span class=special>(</span>
117 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span><span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</span> <span class=identifier>y</span><span class=special>);</span>
118
119<span class=comment>// index specialized algorithms:</span>
120
121<span class=keyword>template</span><span class=special>&lt;</span><b>implementation defined</b><span class=special>&gt;</span>
122<span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>y</span><span class=special>);</span>
123
124<span class=special>}</span> <span class=comment>// namespace boost::multi_index::detail</span>
125
126<span class=special>}</span> <span class=comment>// namespace boost::multi_index</span>
127
128<span class=special>}</span> <span class=comment>// namespace boost</span>
129</pre></blockquote>
130
131<h3><a name="random_access">
132<code>random_access</code> index specifier
133</a></h3>
134
135<p>
136This index specifier allows for insertion of a <a href="#rnd_indices">random
137access index</a>.</p>
138
139<blockquote><pre>
140<span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>TagList</span><span class=special>=</span><span class=identifier>tag</span><span class=special>&lt;&gt;</span> <span class=special>&gt;</span> <span class=keyword>struct</span> <span class=identifier>random_access</span><span class=special>;</span>
141</pre></blockquote>
142
143<p>If provided, <code>TagList</code> must be an instantiation of
144<a href="indices.html#tag"><code>tag</code></a>.
145</p>
146
147<h3><a name="rnd_indices">Random access indices</a></h3>
148
149<p>
150Random access indices are free-order sequences with constant time
151positional access and random access iterators. Elements in a
152random access index are by default sorted according to their order of
153insertion: this means that new elements inserted through a different index
154of the <code>multi_index_container</code> are appended to the end of the
155random access index; additionally, facilities are provided
156for further rearrangement of the elements. The public interface of
157random access indices includes that of
158<a href="seq_indices.html">sequenced indices</a>, with differences in
159the complexity of the operations, plus extra operations for
160positional access (<code>operator[]</code> and <code>at()</code>) and
161for capacity handling. Validity of iterators and references to elements
162is preserved in all operations, regardless of the capacity status.
163</p>
164
165<p>
166Except where noted or if the corresponding interface does not exist, random access
167indices verify the same container requirements as <code>std::vector</code>
168plus the requirements for <code>std::list</code> specific list operations at
169<b>[list.ops]</b>. Some of the most important differences with respect to
170<code>std::vector</code> are:
171<ul>
172 <li>Random access indices do not provide memory contiguity, and hence do not
173 have <code>data</code> member functions.
174 </li>
175
176 <li>The complexity of some operations, notably insertion and deletion, differ
177 from those of <code>std::vector</code>.
178 </li>
179 <li>Unlike as in <code>std::vector</code>, insertions into a random access index
180 may fail due to clashings with other indices. This alters the semantics
181 of the operations provided with respect to their analogues in
182 <code>std::vector</code>.
183 </li>
184 <li>Elements in a randon access index are not mutable, and can only be changed
185 by means of <a href="#replace"><code>replace</code></a> and
186 <a href="#modify"><code>modify</code></a> member functions.
187 </li>
188 <li><code>push_front</code> and <code>pop_front</code> are provided for
189 compatibility with sequenced indices, even though they take linear time to execute.
190 </li></ul>
191</p>
192
193<blockquote><pre>
194<span class=keyword>namespace</span> <span class=identifier>boost</span><span class=special>{</span>
195
196<span class=keyword>namespace</span> <span class=identifier>multi_index</span><span class=special>{</span>
197
198<span class=keyword>namespace</span> <span class=identifier>detail</span><span class=special>{</span>
199
200<span class=keyword>template</span><span class=special>&lt;</span><b>implementation defined: dependent on types Value, Allocator, TagList</b><span class=special>&gt;</span>
201<span class=keyword>class</span> <b>name is implementation defined</b>
202<span class=special>{</span>
203<span class=keyword>public</span><span class=special>:</span>
204 <span class=comment>// types:</span>
205
206 <span class=keyword>typedef</span> <span class=identifier>Value</span> <span class=identifier>value_type</span><span class=special>;</span>
207 <span class=keyword>typedef</span> <span class=identifier>boost</span><span class=special>::</span><span class=identifier>tuples</span><span class=special>::</span><span class=identifier>null_type</span> <span class=identifier>ctor_args</span><span class=special>;</span>
208 <span class=keyword>typedef</span> <span class=identifier>TagList</span> <span class=identifier>tag_list</span><span class=special>;</span>
209 <span class=keyword>typedef</span> <span class=identifier>Allocator</span> <span class=identifier>allocator_type</span><span class=special>;</span>
210 <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>allocator_type</span><span class=special>::</span><span class=identifier>reference</span> <span class=identifier>reference</span><span class=special>;</span>
211 <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>allocator_type</span><span class=special>::</span><span class=identifier>const_reference</span> <span class=identifier>const_reference</span><span class=special>;</span>
212 <span class=keyword>typedef</span> <b>implementation defined</b> <span class=identifier>iterator</span><span class=special>;</span>
213 <span class=keyword>typedef</span> <b>implementation defined</b> <span class=identifier>const_iterator</span><span class=special>;</span>
214 <span class=keyword>typedef</span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>size_t</span> <span class=identifier>size_type</span><span class=special>;</span>
215 <span class=keyword>typedef</span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>ptrdiff_t</span> <span class=identifier>difference_type</span><span class=special>;</span>
216 <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>allocator_type</span><span class=special>::</span><span class=identifier>pointer</span> <span class=identifier>pointer</span><span class=special>;</span>
217 <span class=keyword>typedef</span> <span class=keyword>typename</span> <span class=identifier>allocator_type</span><span class=special>::</span><span class=identifier>const_pointer</span> <span class=identifier>const_pointer</span><span class=special>;</span>
218 <span class=keyword>typedef</span> <b>equivalent to
219 std::reverse_iterator&lt;iterator&gt;</b> <span class=identifier>reverse_iterator</span><span class=special>;</span>
220 <span class=keyword>typedef</span> <b>equivalent to
221 std::reverse_iterator&lt;const_iterator&gt;</b> <span class=identifier>const_reverse_iterator</span><span class=special>;</span>
222
223 <span class=comment>// construct/copy/destroy:</span>
224
225 <b>index class name</b><span class=special>&amp;</span> <span class=keyword>operator</span><span class=special>=(</span><span class=keyword>const</span> <b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
226 <b>index class name</b><span class=special>&amp;</span> <span class=keyword>operator</span><span class=special>=(</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>initializer_list</span><span class=special>&lt;</span><span class=identifier>value_type</span><span class=special>&gt;</span> <span class=identifier>list</span><span class=special>);</span>
227
228 <span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>class</span> <span class=identifier>InputIterator</span><span class=special>&gt;</span>
229 <span class=keyword>void</span> <span class=identifier>assign</span><span class=special>(</span><span class=identifier>InputIterator</span> <span class=identifier>first</span><span class=special>,</span><span class=identifier>InputIterator</span> <span class=identifier>last</span><span class=special>);</span>
230 <span class=keyword>void</span> <span class=identifier>assign</span><span class=special>(</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>initializer_list</span><span class=special>&lt;</span><span class=identifier>value_type</span><span class=special>&gt;</span> <span class=identifier>list</span><span class=special>)</span>
231 <span class=keyword>void</span> <span class=identifier>assign</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>n</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>value</span><span class=special>);</span>
232
233 <span class=identifier>allocator_type</span> <span class=identifier>get_allocator</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
234
235 <span class=comment>// iterators:</span>
236
237 <span class=identifier>iterator</span> <span class=identifier>begin</span><span class=special>()</span><span class=keyword>noexcept</span><span class=special>;</span>
238 <span class=identifier>const_iterator</span> <span class=identifier>begin</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
239 <span class=identifier>iterator</span> <span class=identifier>end</span><span class=special>()</span><span class=keyword>noexcept</span><span class=special>;</span>
240 <span class=identifier>const_iterator</span> <span class=identifier>end</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
241 <span class=identifier>reverse_iterator</span> <span class=identifier>rbegin</span><span class=special>()</span><span class=keyword>noexcept</span><span class=special>;</span>
242 <span class=identifier>const_reverse_iterator</span> <span class=identifier>rbegin</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
243 <span class=identifier>reverse_iterator</span> <span class=identifier>rend</span><span class=special>()</span><span class=keyword>noexcept</span><span class=special>;</span>
244 <span class=identifier>const_reverse_iterator</span> <span class=identifier>rend</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
245 <span class=identifier>const_iterator</span> <span class=identifier>cbegin</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
246 <span class=identifier>const_iterator</span> <span class=identifier>cend</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
247 <span class=identifier>const_reverse_iterator</span> <span class=identifier>crbegin</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
248 <span class=identifier>const_reverse_iterator</span> <span class=identifier>crend</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
249
250 <span class=identifier>iterator</span> <span class=identifier>iterator_to</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
251 <span class=identifier>const_iterator</span> <span class=identifier>iterator_to</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span>
252
253 <span class=comment>// capacity:</span>
254
255 <span class=keyword>bool</span> <span class=identifier>empty</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
256 <span class=identifier>size_type</span> <span class=identifier>size</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
257 <span class=identifier>size_type</span> <span class=identifier>max_size</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
258 <span class=identifier>size_type</span> <span class=identifier>capacity</span><span class=special>()</span><span class=keyword>const</span> <span class=keyword>noexcept</span><span class=special>;</span>
259 <span class=keyword>void</span> <span class=identifier>reserve</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>m</span><span class=special>);</span>
260 <span class=keyword>void</span> <span class=identifier>shrink_to_fit</span><span class=special>();</span>
261
262 <span class=keyword>void</span> <span class=identifier>resize</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>n</span><span class=special>);</span>
263 <span class=keyword>void</span> <span class=identifier>resize</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>n</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
264
265 <span class=comment>// access:</span>
266
267 <span class=identifier>const_reference</span> <span class=keyword>operator</span><span class=special>[](</span><span class=identifier>size_type</span> <span class=identifier>n</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span>
268 <span class=identifier>const_reference</span> <span class=identifier>at</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>n</span><span class=special>)</span><span class=keyword>const</span><span class=special>;</span>
269 <span class=identifier>const_reference</span> <span class=identifier>front</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span>
270 <span class=identifier>const_reference</span> <span class=identifier>back</span><span class=special>()</span><span class=keyword>const</span><span class=special>;</span>
271
272 <span class=comment>// modifiers:</span>
273
274 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span><span class=special>...</span> <span class=identifier>Args</span><span class=special>&gt;</span>
275 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>emplace_front</span><span class=special>(</span><span class=identifier>Args</span><span class=special>&amp;&amp;...</span> <span class=identifier>args</span><span class=special>);</span>
276 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>push_front</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
277 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>push_front</span><span class=special>(</span><span class=identifier>value_type</span><span class=special>&amp;&amp;</span> <span class=identifier>x</span><span class=special>);</span>
278 <span class=keyword>void</span> <span class=identifier>pop_front</span><span class=special>();</span>
279
280 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span><span class=special>...</span> <span class=identifier>Args</span><span class=special>&gt;</span>
281 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>emplace_back</span><span class=special>(</span><span class=identifier>Args</span><span class=special>&amp;&amp;...</span> <span class=identifier>args</span><span class=special>);</span>
282 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>push_back</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
283 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>push_back</span><span class=special>(</span><span class=identifier>value_type</span><span class=special>&amp;&amp;</span> <span class=identifier>x</span><span class=special>);</span>
284 <span class=keyword>void</span> <span class=identifier>pop_back</span><span class=special>();</span>
285
286 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span><span class=special>...</span> <span class=identifier>Args</span><span class=special>&gt;</span>
287 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>emplace</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>Args</span><span class=special>&amp;&amp;...</span> <span class=identifier>args</span><span class=special>);</span>
288 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>insert</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
289 <span class=identifier>std</span><span class=special>::</span><span class=identifier>pair</span><span class=special>&lt;</span><span class=identifier>iterator</span><span class=special>,</span><span class=keyword>bool</span><span class=special>&gt;</span> <span class=identifier>insert</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>value_type</span><span class=special>&amp;&amp;</span> <span class=identifier>x</span><span class=special>);</span>
290 <span class=keyword>void</span> <span class=identifier>insert</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>size_type</span> <span class=identifier>m</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
291 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>InputIterator</span><span class=special>&gt;</span>
292 <span class=keyword>void</span> <span class=identifier>insert</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>InputIterator</span> <span class=identifier>first</span><span class=special>,</span><span class=identifier>InputIterator</span> <span class=identifier>last</span><span class=special>);</span>
293 <span class=keyword>void</span> <span class=identifier>insert</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>initializer_list</span><span class=special>&lt;</span><span class=identifier>value_type</span><span class=special>&gt;</span> <span class=identifier>list</span><span class=special>);</span>
294
295 <span class=identifier>iterator</span> <span class=identifier>erase</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>);</span>
296 <span class=identifier>iterator</span> <span class=identifier>erase</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>first</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>last</span><span class=special>);</span>
297
298 <span class=keyword>bool</span> <span class=identifier>replace</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
299 <span class=keyword>bool</span> <span class=identifier>replace</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>value_type</span><span class=special>&amp;&amp;</span> <span class=identifier>x</span><span class=special>);</span>
300 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Modifier</span><span class=special>&gt;</span> <span class=keyword>bool</span> <span class=identifier>modify</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>Modifier</span> <span class=identifier>mod</span><span class=special>);</span>
301 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Modifier</span><span class=special>,</span><span class=keyword>typename</span> <span class=identifier>Rollback</span><span class=special>&gt;</span>
302 <span class=keyword>bool</span> <span class=identifier>modify</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>Modifier</span> <span class=identifier>mod</span><span class=special>,</span><span class=identifier>Rollback</span> <span class=identifier>back</span><span class=special>);</span>
303
304 <span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
305
306 <span class=keyword>void</span> <span class=identifier>clear</span><span class=special>()</span><span class=keyword>noexcept</span><span class=special>;</span>
307
308 <span class=comment>// list operations:</span>
309
310 <span class=keyword>void</span> <span class=identifier>splice</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
311 <span class=keyword>void</span> <span class=identifier>splice</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>i</span><span class=special>);</span>
312 <span class=keyword>void</span> <span class=identifier>splice</span><span class=special>(</span>
313 <span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>first</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>last</span><span class=special>);</span>
314
315 <span class=keyword>void</span> <span class=identifier>remove</span><span class=special>(</span><span class=keyword>const</span> <span class=identifier>value_type</span><span class=special>&amp;</span> <span class=identifier>value</span><span class=special>);</span>
316 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Predicate</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>remove_if</span><span class=special>(</span><span class=identifier>Predicate</span> <span class=identifier>pred</span><span class=special>);</span>
317
318 <span class=keyword>void</span> <span class=identifier>unique</span><span class=special>();</span>
319 <span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>class</span> <span class=identifier>BinaryPredicate</span><span class=special>&gt;</span>
320 <span class=keyword>void</span> <span class=identifier>unique</span><span class=special>(</span><span class=identifier>BinaryPredicate</span> <span class=identifier>binary_pred</span><span class=special>);</span>
321
322 <span class=keyword>void</span> <span class=identifier>merge</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>);</span>
323 <span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>merge</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><span class=identifier>Compare</span> <span class=identifier>comp</span><span class=special>);</span>
324
325 <span class=keyword>void</span> <span class=identifier>sort</span><span class=special>();</span>
326 <span class=keyword>template</span> <span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>Compare</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>sort</span><span class=special>(</span><span class=identifier>Compare</span> <span class=identifier>comp</span><span class=special>);</span>
327
328 <span class=keyword>void</span> <span class=identifier>reverse</span><span class=special>()</span><span class=keyword>noexcept</span><span class=special>;</span>
329
330 <span class=comment>// rearrange operations:</span>
331
332 <span class=keyword>void</span> <span class=identifier>relocate</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>i</span><span class=special>);</span>
333 <span class=keyword>void</span> <span class=identifier>relocate</span><span class=special>(</span><span class=identifier>iterator</span> <span class=identifier>position</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>first</span><span class=special>,</span><span class=identifier>iterator</span> <span class=identifier>last</span><span class=special>);</span>
334 <span class=keyword>template</span><span class=special>&lt;</span><span class=keyword>typename</span> <span class=identifier>InputIterator</span><span class=special>&gt;</span> <span class=keyword>void</span> <span class=identifier>rearrange</span><span class=special>(</span><span class=identifier>InputIterator</span> <span class=identifier>first</span><span class=special>);</span>
335<span class=special>}</span>
336
337<span class=comment>// index comparison:</span>
338
339<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
340<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>==(</span>
341 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
342 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</span> <span class=identifier>y</span><span class=special>)</span>
343<span class=special>{</span>
344 <span class=keyword>return</span> <span class=identifier>x</span><span class=special>.</span><span class=identifier>size</span><span class=special>()==</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>size</span><span class=special>()&amp;&amp;</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>equal</span><span class=special>(</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>begin</span><span class=special>());</span>
345<span class=special>}</span>
346
347<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
348<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&lt;(</span>
349 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
350 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</span> <span class=identifier>y</span><span class=special>)</span>
351<span class=special>{</span>
352 <span class=keyword>return</span> <span class=identifier>std</span><span class=special>::</span><span class=identifier>lexicographical_compare</span><span class=special>(</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>x</span><span class=special>.</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>y</span><span class=special>.</span><span class=identifier>end</span><span class=special>());</span>
353<span class=special>}</span>
354
355<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
356<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>!=(</span>
357 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
358 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</span> <span class=identifier>y</span><span class=special>)</span>
359<span class=special>{</span>
360 <span class=keyword>return</span> <span class=special>!(</span><span class=identifier>x</span><span class=special>==</span><span class=identifier>y</span><span class=special>);</span>
361<span class=special>}</span>
362
363<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
364<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&gt;(</span>
365 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span>
366 <span class=special>,</span><span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</span> <span class=identifier>y</span><span class=special>)</span>
367<span class=special>{</span>
368 <span class=keyword>return</span> <span class=identifier>y</span><span class=special>&lt;</span><span class=identifier>x</span><span class=special>;</span>
369<span class=special>}</span>
370
371<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
372<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&gt;=(</span>
373 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
374 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</span> <span class=identifier>y</span><span class=special>)</span>
375<span class=special>{</span>
376 <span class=keyword>return</span> <span class=special>!(</span><span class=identifier>x</span><span class=special>&lt;</span><span class=identifier>y</span><span class=special>);</span>
377<span class=special>}</span>
378
379<span class=keyword>template</span><span class=special>&lt;</span><b>arg set 1</b><span class=special>,</span><b>arg set 2</b><span class=special>&gt;</span>
380<span class=keyword>bool</span> <span class=keyword>operator</span><span class=special>&lt;=(</span>
381 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 1</b><span class=special>&gt;&amp;</span> <span class=identifier>x</span><span class=special>,</span>
382 <span class=keyword>const</span> <b>index class name</b><span class=special>&lt;</span><b>arg set 2</b><span class=special>&gt;&amp;</span> <span class=identifier>y</span><span class=special>)</span>
383<span class=special>{</span>
384 <span class=keyword>return</span> <span class=special>!(</span><span class=identifier>x</span><span class=special>&gt;</span><span class=identifier>y</span><span class=special>);</span>
385<span class=special>}</span>
386
387<span class=comment>// index specialized algorithms:</span>
388
389<span class=keyword>template</span><span class=special>&lt;</span><b>implementation defined</b><span class=special>&gt;</span>
390<span class=keyword>void</span> <span class=identifier>swap</span><span class=special>(</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>x</span><span class=special>,</span><b>index class name</b><span class=special>&amp;</span> <span class=identifier>y</span><span class=special>);</span>
391
392<span class=special>}</span> <span class=comment>// namespace boost::multi_index::detail</span>
393
394<span class=special>}</span> <span class=comment>// namespace boost::multi_index</span>
395
396<span class=special>}</span> <span class=comment>// namespace boost</span>
397</pre></blockquote>
398
399<h4><a name="complexity_signature">Complexity signature</a></h4>
400
401<p>
402Here and in the descriptions of operations of random access indices, we
403adopt the scheme outlined in the
404<a href="indices.html#complexity_signature">complexity signature
405section</a>. The complexity signature of random access indices is:
406<ul>
407 <li>copying: <code>c(n)=n*log(n)</code>,</li>
408 <li>insertion: <code>i(n)=1</code> (amortized constant),</li>
409 <li>hinted insertion: <code>h(n)=1</code> (amortized constant),</li>
410 <li>deletion: <code>d(n)=m</code>, where <code>m</code> is the distance
411 from the deleted element to the end of the sequence,</li>
412 <li>replacement: <code>r(n)=1</code> (constant),</li>
413 <li>modifying: <code>m(n)=1</code> (constant).</li>
414</ul>
415The following expressions are also used as a convenience for writing down some
416of the complexity formulas:
417</p>
418
419<blockquote>
420<code>shl(a,b)</code> = <code>a+b</code> if a is nonzero, <code>0</code> otherwise.<br>
421<code>rel(a,b,c)</code> = if <code>a&lt;b</code>, <code>c-a</code>, else <code>a-b</code>,
422</blockquote>
423
424<p>
425(<code>shl</code> and <code>rel</code> stand for <i>shift left</i> and
426<i>relocate</i>, respectively.)
427</p>
428
429<h4><a name="instantiation_types">Instantiation types</a></h4>
430
431<p>Random access indices are instantiated internally to <code>multi_index_container</code>
432and specified by means of <a href="indices.html#indexed_by">
433<code>indexed_by</code></a> with the <a href="#random_access"><code>random_access</code></a>
434index specifier. Instantiations are dependent on the following types:
435<ul>
436 <li><code>Value</code> from <code>multi_index_container</code>,</li>
437 <li><code>Allocator</code> from <code>multi_index_container</code>,</li>
438 <li><code>TagList</code> from the index specifier (if provided, otherwise <code>tag&lt;&gt;</code> is assumed).</li>
439</ul>
440<code>TagList</code> must be an instantiation of
441<a href="indices.html#tag"><code>tag</code></a>.
442</p>
443
444<h4><a name="constructors">Constructors, copy and assignment</a></h4>
445
446<p>
447As explained in the <a href="indices.html#index_concepts">index
448concepts section</a>, indices do not have public constructors or destructors.
449Assignment, on the other hand, is provided.
450</p>
451
452<code><b>index class name</b>&amp; operator=(const <b>index class name</b>&amp; x);</code>
453
454<blockquote>
455<b>Effects:</b>
456<blockquote><pre>
457<span class=identifier>a</span><span class=special>=</span><span class=identifier>b</span><span class=special>;</span>
458</pre></blockquote>
459where <code>a</code> and <code>b</code> are the <code>multi_index_container</code>
460objects to which <code>*this</code> and <code>x</code> belong, respectively.<br>
461<b>Returns:</b> <code>*this</code>.<br>
462</blockquote>
463
464<code><b>index class name</b>&amp; operator=(std::initializer_list&lt;value_type&gt; list);</code>
465
466<blockquote>
467<b>Effects:</b>
468<blockquote><pre>
469<span class=identifier>a</span><span class=special>=</span><span class=identifier>list</span><span class=special>;</span>
470</pre></blockquote>
471where <code>a</code> is the <code>multi_index_container</code>
472object to which <code>*this</code> belongs.<br>
473<b>Returns:</b> <code>*this</code>.<br>
474</blockquote>
475
476<code>template &lt;class InputIterator><br>
477void assign(InputIterator first,InputIterator last);</code>
478
479<blockquote>
480<b>Effects:</b>
481<blockquote><pre>
482<span class=identifier>clear</span><span class=special>();</span>
483<span class=identifier>insert</span><span class=special>(</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>first</span><span class=special>,</span><span class=identifier>last</span><span class=special>);</span>
484</pre></blockquote>
485</blockquote>
486
487<code>void assign(std::initializer_list&lt;value_type&gt; list);</code>
488
489<blockquote>
490<b>Effects:</b>
491<blockquote><pre>
492<span class=identifier>assign</span><span class=special>(</span><span class=identifier>list</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>list</span><span class=special>.</span><span class=identifier>end</span><span class=special>());</span>
493</pre></blockquote>
494</blockquote>
495
496<code>void assign(size_type n,const value_type&amp; value);</code>
497
498<blockquote>
499<b>Effects:</b>
500<blockquote><pre>
501<span class=identifier>clear</span><span class=special>();</span>
502<span class=keyword>for</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>i</span><span class=special>=</span><span class=number>0</span><span class=special>;</span><span class=identifier>i</span><span class=special>&lt;</span><span class=identifier>n</span><span class=special>;++</span><span class=identifier>n</span><span class=special>)</span><span class=identifier>push_back</span><span class=special>(</span><span class=identifier>v</span><span class=special>);</span>
503</pre></blockquote>
504</blockquote>
505
506<h4><a name="iterators">Iterators</a></h4>
507
508<code>iterator&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iterator_to(const value_type&amp; x);<br>
509const_iterator iterator_to(const value_type&amp; x)const;</code>
510
511<blockquote>
512<b>Requires:</b> <code>x</code> is a reference to an element of the container.<br>
513<b>Returns:</b> An iterator to <code>x</code>.<br>
514<b>Complexity:</b> Constant.<br>
515<b>Exception safety:</b> <code>nothrow</code>.<br>
516</blockquote>
517
518<h4><a name="capacity">Capacity operations</a></h4>
519
520<a name="capacity_memfun"><code>size_type capacity()const noexcept;</code></a>
521
522<blockquote>
523<b>Returns:</b> The total number of elements <code>c</code> such that, when
524<code>size()&lt;c</code>, back insertions happen in constant time (the
525general case as described by
526<a href="#complexity_signature"><code>i(n)</code></a> is <i>amortized</i>
527constant time.)<br>
528<b>Note:</b> Validity of iterators and references to elements
529is preserved in all insertions, regardless of the capacity status.
530</blockquote>
531
532<a name="reserve"><code>void reserve(size_type m);</code></a>
533
534<blockquote>
535<b>Effects:</b> If the previous value of <code>capacity()</code>
536was greater than or equal to <code>m</code>, nothing is done;
537otherwise, the internal capacity is changed so that
538<code>capacity()>=m</code>.<br>
539<b>Complexity:</b> If the capacity is not changed, constant;
540otherwise <code>O(n)</code>.<br>
541<b>Exception safety:</b> If the capacity is not changed, <code>nothrow</code>;
542otherwise, strong.<br>
543</blockquote>
544
545<code>void shrink_to_fit();</code>
546
547<blockquote>
548<b>Effects:</b> Reduces <code>capacity()</code> to <code>size()</code>.<br>
549<b>Complexity:</b> If the capacity is not changed, constant;
550otherwise <code>O(n)</code>.<br>
551<b>Exception safety:</b> If the capacity is not changed, <code>nothrow</code>;
552otherwise, strong.<br>
553</blockquote>
554
555<code>void resize(size_type n);<br>
556void resize(size_type n,const value_type&amp; x);</code>
557
558<blockquote>
559<b>Requires (first version):</b> <code>value_type</code> is <code>DefaultInsertable</code>
560into <code>multi_index_container</code>.<br>
561<b>Requires (second version):</b> <code>value_type</code> is <code>CopyInsertable</code>
562into <code>multi_index_container</code>.<br>
563<b>Effects:</b> If <code>size()&lt;n</code>, tries to append <code>n-size()</code> default-inserted
564elements (first version) or copies of <code>x</code> (second version) at the end of
565the index. If <code>n&lt;size()</code>, erases the last <code>size()-n</code> elements.<br>
566<b>Note:</b> If an expansion is requested, the size of the index is not guaranteed
567to be <code>n</code> after this operation (other indices may ban insertions.)
568</blockquote>
569
570<h4><a name="modifiers">Modifiers</a></h4>
571
572<code>template&lt;typename... Args&gt;<br>
573std::pair&lt;iterator,bool&gt; emplace_front(Args&amp;&amp;... args);</code>
574
575<blockquote>
576<b>Effects:</b>
577<blockquote><pre>
578<span class=identifier>emplace</span><span class=special>(</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>forward</span><span class=special>&lt;</span><span class=identifier>Args</span><span class=special>&gt;(</span><span class=identifier>args</span><span class=special>)...);</span>
579</pre></blockquote>
580<b>Returns:</b> The return value is a pair <code>p</code>. <code>p.second</code>
581is <code>true</code> if and only if insertion took place. On successful
582insertion, <code>p.first</code> points to the element inserted; otherwise,
583<code>p.first</code> points to an element that caused the insertion to be banned.
584Note that more than one element can be causing insertion not to be allowed.<br>
585</blockquote>
586
587<code>std::pair&lt;iterator,bool> push_front(const value_type&amp; x);</code><br>
588<code>std::pair&lt;iterator,bool> push_front(value_type&amp;&amp; x);</code>
589
590<blockquote>
591<b>Effects:</b>
592<blockquote><pre>
593<span class=identifier>insert</span><span class=special>(</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>x</span><span class=special>);</span> <span class=comment>// lvalue ref version</span>
594<span class=identifier>insert</span><span class=special>(</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>move</span><span class=special>(</span><span class=identifier>x</span><span class=special>));</span> <span class=comment>// rvalue ref version</span>
595</pre></blockquote>
596<b>Returns:</b> The return value is a pair <code>p</code>. <code>p.second</code>
597is <code>true</code> if and only if insertion took place. On successful
598insertion, <code>p.first</code> points to the element inserted; otherwise,
599<code>p.first</code> points to an element that caused the insertion to be banned.
600Note that more than one element can be causing insertion not to be allowed.<br>
601</blockquote>
602
603<code>template&lt;typename... Args&gt;<br>
604std::pair&lt;iterator,bool&gt; emplace_back(Args&amp;&amp;... args);</code>
605
606<blockquote>
607<b>Effects:</b>
608<blockquote><pre>
609<span class=identifier>emplace</span><span class=special>(</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>forward</span><span class=special>&lt;</span><span class=identifier>Args</span><span class=special>&gt;(</span><span class=identifier>args</span><span class=special>)...);</span>
610</pre></blockquote>
611<b>Returns:</b> The return value is a pair <code>p</code>. <code>p.second</code>
612is <code>true</code> if and only if insertion took place. On successful
613insertion, <code>p.first</code> points to the element inserted; otherwise,
614<code>p.first</code> points to an element that caused the insertion to be banned.
615Note that more than one element can be causing insertion not to be allowed.<br>
616</blockquote>
617
618<code>std::pair&lt;iterator,bool> push_back(const value_type&amp; x);</code><br>
619<code>std::pair&lt;iterator,bool> push_back(value_type&amp;&amp; x);</code>
620
621<blockquote>
622<b>Effects:</b>
623<blockquote><pre>
624<span class=identifier>insert</span><span class=special>(</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>x</span><span class=special>);</span> <span class=comment>// lvalue ref version</span>
625<span class=identifier>insert</span><span class=special>(</span><span class=identifier>end</span><span class=special>(),</span><span class=identifier>std</span><span class=special>::</span><span class=identifier>move</span><span class=special>(</span><span class=identifier>x</span><span class=special>));</span> <span class=comment>// rvalue ref version</span>
626</pre></blockquote>
627<b>Returns:</b> The return value is a pair <code>p</code>. <code>p.second</code>
628is <code>true</code> if and only if insertion took place. On successful
629insertion, <code>p.first</code> points to the element inserted; otherwise,
630<code>p.first</code> points to an element that caused the insertion to be banned.
631Note that more than one element can be causing insertion not to be allowed.<br>
632</blockquote>
633
634<code>template&lt;typename... Args&gt;<br>
635 std::pair&lt;iterator,bool&gt; emplace(iterator position,Args&amp;&amp;... args);</code>
636
637<blockquote>
638<b>Requires:</b> <code>value_type</code> is <code>EmplaceConstructible</code>
639into <code>multi_index_container</code> from <code>args</code>.<br>
640<b>Effects:</b> Inserts a <code>value_type</code> object constructed with
641<code>std::forward&lt;Args&gt;(args)...</code> before <code>position</code> if insertion
642is allowed by all other indices of the <code>multi_index_container</code>.<br>
643<b>Returns:</b> The return value is a pair <code>p</code>. <code>p.second</code>
644is <code>true</code> if and only if insertion took place. On successful insertion,
645<code>p.first</code> points to the element inserted; otherwise, <code>p.first</code>
646points to an element that caused the insertion to be banned. Note that more than
647one element can be causing insertion not to be allowed.<br>
648<b>Complexity:</b> <code>O(I(n))</code>.<br>
649<b>Exception safety:</b> Strong.<br>
650</blockquote>
651
652<code>std::pair&lt;iterator,bool> insert(iterator position,const value_type&amp; x);</code><br>
653<code>std::pair&lt;iterator,bool> insert(iterator position,value_type&amp;&amp; x);</code>
654
655<blockquote>
656<b>Requires (first version):</b> <code>value_type</code> is <code>CopyInsertable</code>
657into <code>multi_index_container</code>.
658<code>position</code> is a valid iterator of the index.<br>
659<b>Requires (second version):</b> <code>value_type</code> is <code>MoveInsertable</code>
660into <code>multi_index_container</code>.
661<code>position</code> is a valid iterator of the index.<br>
662<b>Effects:</b> Inserts <code>x</code> before <code>position</code> if insertion
663is allowed by all other indices of the <code>multi_index_container</code>.<br>
664<b>Returns:</b> The return value is a pair <code>p</code>. <code>p.second</code>
665is <code>true</code> if and only if insertion took place. On successful
666insertion, <code>p.first</code> points to the element inserted; otherwise,
667<code>p.first</code> points to an element that caused the insertion to be banned.
668Note that more than one element can be causing insertion not to be allowed.<br>
669<b>Complexity:</b> <code>O(I(n))</code>.<br>
670<b>Exception safety:</b> Strong.
671</blockquote>
672
673<code>void insert(iterator position,size_type m,const value_type&amp; x);</code>
674
675<blockquote>
676<b>Requires:</b> <code>position</code> is a valid iterator of the index.<br>
677<b>Effects:</b>
678<blockquote><pre>
679<span class=keyword>for</span><span class=special>(</span><span class=identifier>size_type</span> <span class=identifier>i</span><span class=special>=</span><span class=number>0</span><span class=special>;</span><span class=identifier>i</span><span class=special>&lt;</span><span class=identifier>m</span><span class=special>;++</span><span class=identifier>i</span><span class=special>)</span><span class=identifier>insert</span><span class=special>(</span><span class=identifier>position</span><span class=special>,</span><span class=identifier>x</span><span class=special>);</span>
680</pre></blockquote>
681<b>Complexity:</b> <code>O(shl(end()-position,m) + m*I(n+m))</code>.
682</blockquote>
683
684<code>template&lt;typename InputIterator><br>
685void insert(iterator position,InputIterator first,InputIterator last);</code>
686
687<blockquote>
688<b>Requires:</b> <code>position</code> is a valid iterator of the index.
689<code>InputIterator</code> is an input iterator.
690<code>value_type</code> is
691<code>EmplaceConstructible</code> into
692<code>multi_index_container</code> from <code>*first</code>.
693<code>first</code> and <code>last</code> are not iterators into any
694index of the <code>multi_index_container</code> to which this index belongs.
695<code>last</code> is reachable from <code>first</code>.<br>
696<b>Effects:</b>
697For each element of [<code>first</code>, <code>last</code>), in this
698order, inserts it before <code>position</code> if insertion is allowed by all
699other indices of the <code>multi_index_container</code>.<br>
700<b>Complexity:</b> <code>O(shl(end()-position,m) + m*I(n+m))</code>,
701where <code>m</code> is the number of elements in
702[<code>first</code>,<code>last</code>).<br>
703<b>Exception safety:</b> Basic.
704</blockquote>
705
706<code>void insert(iterator position,std::initializer_list&lt;value_type&gt; list);</code>
707
708<blockquote>
709<b>Effects:</b>
710<blockquote><pre>
711<span class=identifier>insert</span><span class=special>(</span><span class=identifier>position</span><span class=special>,</span><span class=identifier>list</span><span class=special>.</span><span class=identifier>begin</span><span class=special>(),</span><span class=identifier>list</span><span class=special>.</span><span class=identifier>end</span><span class=special>());</span>
712</pre></blockquote>
713</blockquote>
714
715<code>iterator erase(iterator position);</code>
716
717<blockquote>
718<b>Requires:</b> <code>position</code> is a valid dereferenceable iterator
719of the index.<br>
720<b>Effects:</b> Deletes the element pointed to by <code>position</code>.<br>
721<b>Returns:</b> An iterator pointing to the element immediately following
722the one that was deleted, or <code>end()</code>
723if no such element exists.<br>
724<b>Complexity:</b> <code>O(D(n))</code>.<br>
725<b>Exception safety:</b> <code>nothrow</code>.<br>
726</blockquote>
727
728<code>iterator erase(iterator first,iterator last);</code>
729
730<blockquote>
731<b>Requires:</b> [<code>first</code>,<code>last</code>) is a valid
732range of the index.<br>
733<b>Effects:</b> Deletes the elements in [<code>first</code>,<code>last</code>).<br>
734<b>Returns:</b> <code>last</code>.<br>
735<b>Complexity:</b> <code>O(m*D(n))</code>, where <code>m</code> is
736the number of elements in [<code>first</code>,<code>last</code>).<br>
737<b>Exception safety:</b> <code>nothrow</code>.<br>
738</blockquote>
739
740<a name="replace"><code>bool replace(iterator position,const value_type&amp; x);</code></a><br>
741<code>bool replace(iterator position,value_type&amp;&amp; x);</code>
742
743<blockquote>
744<b>Requires (first version):</b> <code>value_type</code> is <code>CopyAssignable</code>.
745<code>position</code> is a valid dereferenceable iterator of the index.<br>
746<b>Requires (second version):</b> <code>value_type</code> is <code>MoveAssignable</code>.
747<code>position</code> is a valid dereferenceable iterator of the index.<br>
748<b>Effects:</b> Assigns the value <code>x</code> to the element pointed
749to by <code>position</code> into the <code>multi_index_container</code> to which
750the index belongs if replacing is allowed by all other indices of the
751<code>multi_index_container</code>.<br>
752<b>Postconditions:</b> Validity of <code>position</code> is preserved
753in all cases.<br>
754<b>Returns:</b> <code>true</code> if the replacement took place,
755<code>false</code> otherwise.<br>
756<b>Complexity:</b> <code>O(R(n))</code>.<br>
757<b>Exception safety:</b> Strong. If an exception is thrown by some
758user-provided operation the <code>multi_index_container</code> to which the index
759belongs remains in its original state.
760</blockquote>
761
762<a name="modify">
763<code>template&lt;typename Modifier> bool modify(iterator position,Modifier mod);</code></a>
764
765<blockquote>
766<b>Requires:</b> <code>mod</code> is a unary function object
767accepting arguments of type
768<code>value_type&amp;</code>. <code>position</code> is a valid dereferenceable
769iterator of the index.
770The execution of <code>mod(e)</code>, where <code>e</code> is the element
771pointed to by <code>position</code>, does not invoke any operation of the
772<code>multi_index_container</code> after <code>e</code> is directly modified
773or, before modification, if the operation would invalidate <code>position</code>.<br>
774<b>Effects:</b> Calls <code>mod(e)</code> where <code>e</code> is the element
775pointed to by <code>position</code> and rearranges <code>*position</code> into
776all the indices of the <code>multi_index_container</code>. Rearrangement on sequenced
777indices does not change the position of the element with respect to the index;
778rearrangement on other indices may or might not succeed. If the rearrangement
779fails, the element is erased.<br>
780<b>Postconditions:</b> Validity of <code>position</code> is preserved if the
781operation succeeds.<br>
782<b>Returns:</b> <code>true</code> if the operation succeeded, <code>false</code>
783otherwise.<br>
784<b>Complexity:</b> <code>O(M(n))</code>.<br>
785<b>Exception safety:</b> Basic. If an exception is thrown by some
786user-provided operation (except possibly <code>mod</code>), then
787the element pointed to by <code>position</code> is erased.
788</blockquote>
789
790<code>template&lt;typename Modifier,typename Rollback><br>
791bool modify(iterator position,Modifier mod,Rollback back);</code>
792
793<blockquote>
794<b>Requires:</b> <code>mod</code> and <code>back</code> are unary function
795objects accepting arguments of type
796<code>value_type&amp;</code>. <code>position</code> is a valid dereferenceable
797iterator of the index.
798The execution of <code>mod(e)</code>, where <code>e</code> is the element
799pointed to by <code>position</code>, does not invoke any operation of the
800<code>multi_index_container</code> after <code>e</code> is directly modified
801or, before modification, if the operation would invalidate <code>position</code>.
802<code>back(e)</code> does not invoke any operation of the
803<code>multi_index_container</code>.
804The sequence of operations <code>mod(e)</code>,
805<code>back(e)</code> restores all keys of the element
806to their original state.<br>
807<b>Effects:</b> Calls <code>mod(e)</code> where <code>e</code> is the element
808pointed to by <code>position</code> and tries to rearrange <code>*position</code> into
809all the indices of the <code>multi_index_container</code>. Rearrangement on sequenced
810indices does not change the position of the element with respect to the index;
811rearrangement on other indices may or might not succeed. If the rearrangement
812fails, <code>back(e)</code> is invoked and the
813element is kept at its original position in all indices.<br>
814<b>Postconditions:</b> Validity of <code>position</code> is preserved except if
815the element is erased under the conditions described below.<br>
816<b>Returns:</b> <code>true</code> if the operation succeeded, <code>false</code>
817otherwise.<br>
818<b>Complexity:</b> <code>O(M(n))</code>.<br>
819<b>Exception safety:</b> Strong, except if <code>back</code> throws an
820exception, in which case the modified element is erased. If <code>back</code>
821throws inside the handling code executing after some other user-provided
822operation has thrown, it is the exception generated by <code>back</code> that
823is rethrown.
824</blockquote>
825
826<h4><a name="list_operations">List operations</a></h4>
827
828<p>
829Random access indices replicate the interface of sequenced indices, which
830in turn includes the list operations provided by <code>std::list</code>.
831The syntax and behavior of these operations exactly matches those
832of sequenced indices, but the associated complexity bounds differ in general.
833</p>
834
835<code>void splice(iterator position,<b>index class name</b>&amp; x);</code>
836
837<blockquote>
838<b>Requires:</b> <code>position</code> is a valid iterator of the index.
839<code>&amp;x!=this</code>.<br>
840<b>Effects:</b> Inserts the contents of <code>x</code> before <code>position</code>,
841in the same order as they were in <code>x</code>. Those elements successfully
842inserted are erased from <code>x</code>.<br>
843<b>Complexity:</b> <code>O(shl(end()-position,x.size()) + x.size()*I(n+x.size()) + x.size()*D(x.size()))</code>.<br>
844<b>Exception safety:</b> Basic.<br>
845</blockquote>
846
847<code>void splice(iterator position,<b>index class name</b>&amp; x,iterator i);</code>
848
849<blockquote>
850<b>Requires:</b> <code>position</code> is a valid iterator of the index.
851<code>i</code> is a valid dereferenceable iterator <code>x</code>.<br>
852<b>Effects:</b> Inserts the element pointed to by <code>i</code> before
853<code>position</code>: if insertion is successful, the element is erased from
854<code>x</code>. In the special case <code>&amp;x==this</code>, no copy or
855deletion is performed, and the operation is always successful. If
856<code>position==i</code>, no operation is performed.<br>
857<b>Postconditions:</b> If <code>&amp;x==this</code>, no iterator or reference
858is invalidated.<br>
859<b>Complexity:</b> If <code>&amp;x==this</code>, <code>O(rel(position,i,i+1))</code>;
860otherwise <code>O(shl(end()-position,1) + I(n) + D(n))</code>.<br>
861<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
862otherwise, strong.<br>
863</blockquote>
864
865<code>void splice(iterator position,<b>index class name&amp;</b> x,iterator first,iterator last);</code>
866
867<blockquote>
868<b>Requires:</b> <code>position</code> is a valid iterator of the index.
869<code>first</code> and <code>last</code> are valid iterators of <code>x</code>.
870<code>last</code> is reachable from <code>first</code>. <code>position</code>
871is not in the range [<code>first</code>,<code>last</code>).<br>
872<b>Effects:</b> For each element in the range [<code>first</code>,<code>last</code>),
873insertion is tried before <code>position</code>; if the operation is successful,
874the element is erased from <code>x</code>. In the special case
875<code>&amp;x==this</code>, no copy or deletion is performed, and insertions are
876always successful.<br>
877<b>Postconditions:</b> If <code>&amp;x==this</code>, no iterator or reference
878is invalidated.<br>
879<b>Complexity:</b> If <code>&amp;x==this</code>,
880<code>O(rel(position,first,last))</code>; otherwise
881<code>O(shl(end()-position,m) + m*I(n+m) + m*D(x.size()))</code>
882where <code>m</code> is the number of elements in [<code>first</code>,<code>last</code>).<br>
883<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
884otherwise, basic.<br>
885</blockquote>
886
887<code>void remove(const value_type&amp; value);</code>
888
889<blockquote>
890<b>Effects:</b> Erases all elements of the index which compare equal to
891<code>value</code>.<br>
892<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
893is the number of elements erased.<br>
894<b>Exception safety:</b> Basic.
895</blockquote>
896
897<code>template&lt;typename Predicate> void remove_if(Predicate pred);</code>
898
899<blockquote>
900<b>Effects:</b> Erases all elements <code>x</code> of the index for which
901<code>pred(x)</code> holds.<br>
902<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
903is the number of elements erased.<br>
904<b>Exception safety:</b> Basic.
905</blockquote>
906
907<code>void unique();</code>
908
909<blockquote>
910<b>Effects:</b> Eliminates all but the first element from every consecutive
911group of equal elements referred to by the iterator <code>i</code> in the range
912[<code>first+1</code>,<code>last</code>) for which <code>*i==*(i-1)</code>.<br>
913<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
914is the number of elements erased.<br>
915<b>Exception safety:</b> Basic.
916</blockquote>
917
918<code>template &lt;class BinaryPredicate> void unique(BinaryPredicate binary_pred);</code>
919
920<blockquote>
921<b>Effects:</b> Eliminates all but the first element from every consecutive
922group of elements referred to by the iterator <code>i</code> in the range
923[<code>first+1</code>,<code>last</code>) for which
924<code>binary_pred(*i,*(i-1))</code> holds.<br>
925<b>Complexity:</b> <code>O(n + m*D(n))</code>, where <code>m</code>
926is the number of elements erased.<br>
927<b>Exception safety:</b> Basic.
928</blockquote>
929
930<code>void merge(index class name&amp; x);</code>
931
932<blockquote>
933<b>Requires:</b> <code>std::less&lt;value_type&gt;</code> induces a
934strict weak ordering over <code>value_type</code>.
935Both the index and <code>x</code> are sorted according to
936<code>std::less&lt;value_type&gt;</code>.<br>
937<b>Effects:</b> Attempts to insert every element of <code>x</code> into the
938corresponding position of the index (according to the order). Elements
939successfully inserted are erased from <code>x</code>. The resulting sequence
940is stable, i.e. equivalent elements of either container preserve their
941relative position. In the special case <code>&amp;x==this</code>, no operation
942is performed.<br>
943<b>Postconditions:</b> Elements in the index and remaining elements in
944<code>x</code> are sorted.
945Validity of iterators to the index and of non-erased elements of <code>x</code>
946references is preserved.<br>
947<b>Complexity:</b> If <code>&amp;x==this</code>, constant; otherwise
948<code>O(n + x.size()*I(n+x.size()) + x.size()*D(x.size()))</code>.<br>
949<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
950otherwise, basic.<br>
951</blockquote>
952
953<code>template &lt;typename Compare> void merge(index class name&amp; x,Compare comp);</code>
954
955<blockquote>
956<b>Requires:</b> <code>Compare</code> induces a
957strict weak ordering over <code>value_type</code>.
958Both the index and <code>x</code> are sorted according to <code>comp</code>.<br>
959<b>Effects:</b> Attempts to insert every element of <code>x</code> into the
960corresponding position of the index (according to <code>comp</code>).
961Elements successfully inserted are erased from <code>x</code>. The resulting
962sequence is stable, i.e. equivalent elements of either container preserve
963their relative position. In the special case <code>&amp;x==this</code>, no
964operation is performed.<br>
965<b>Postconditions:</b> Elements in the index and remaining elements in
966<code>x</code> are sorted according to <code>comp</code>.
967Validity of iterators to the index and of non-erased elements of <code>x</code>
968references is preserved.<br>
969<b>Complexity:</b> If <code>&amp;x==this</code>, constant; otherwise
970<code>O(n + x.size()*I(n+x.size()) + x.size()*D(x.size()))</code>.<br>
971<b>Exception safety:</b> If <code>&amp;x==this</code>, <code>nothrow</code>;
972otherwise, basic.<br>
973</blockquote>
974
975<code>void sort();</code>
976
977<blockquote>
978<b>Requires:</b> <code>std::less&lt;value_type&gt;</code> induces a
979strict weark ordering over <code>value_type</code>.<br>
980<b>Effects:</b> Sorts the index according to
981<code>std::less&lt;value_type></code>. The sorting is stable, i.e.
982equivalent elements preserve their relative position.<br>
983<b>Postconditions:</b> Validity of iterators and references is preserved.<br>
984<b>Complexity:</b> <code>O(n*log(n))</code>.<br>
985<b>Exception safety:</b> Basic.
986</blockquote>
987
988<code>template &lt;typename Compare> void sort(Compare comp);</code>
989
990<blockquote>
991<b>Requires:</b> <code>Compare</code> induces a
992strict weak ordering over <code>value_type</code>.<br>
993<b>Effects:</b> Sorts the index according to <code>comp</code>. The sorting
994is stable, i.e. equivalent elements preserve their relative position.<br>
995<b>Postconditions:</b> Validity of iterators and references is preserved.<br>
996<b>Complexity:</b> <code>O(n*log(n))</code>.<br>
997<b>Exception safety:</b> Basic.
998</blockquote>
999
1000<code>void reverse()noexcept;</code>
1001
1002<blockquote>
1003<b>Effects:</b> Reverses the order of the elements in the index.<br>
1004<b>Postconditions:</b> Validity of iterators and references is preserved.<br>
1005<b>Complexity:</b> <code>O(n)</code>.<br>
1006</blockquote>
1007
1008<h4><a name="rearrange_operations">Rearrange operations</a></h4>
1009
1010<p>
1011These operations, without counterpart in STL sequence containers
1012(although <code>std::list::splice</code> provides partially overlapping
1013functionality), perform individual and global repositioning of elements
1014inside the index.
1015</p>
1016
1017<code>void relocate(iterator position,iterator i);</code>
1018
1019<blockquote>
1020<b>Requires:</b> <code>position</code> is a valid iterator of the index.
1021<code>i</code> is a valid dereferenceable iterator of the index.<br>
1022<b>Effects:</b> Inserts the element pointed to by <code>i</code> before
1023<code>position</code>. If <code>position==i</code>, no operation is
1024performed.<br>
1025<b>Postconditions:</b> No iterator or reference is invalidated.<br>
1026<b>Complexity:</b> <code>O(rel(position,i,i+1))</code>.<br>
1027<b>Exception safety:</b> <code>nothrow</code>.<br>
1028</blockquote>
1029
1030<code>void relocate(iterator position,iterator first,iterator last);</code>
1031
1032<blockquote>
1033<b>Requires:</b> <code>position</code> is a valid iterator of the index.
1034<code>first</code> and <code>last</code> are valid iterators of the index.
1035<code>last</code> is reachable from <code>first</code>. <code>position</code>
1036is not in the range [<code>first</code>,<code>last</code>).<br>
1037<b>Effects:</b> The range of elements [<code>first</code>,<code>last</code>)
1038is repositioned just before <code>position</code>.<br>
1039<b>Postconditions:</b> No iterator or reference is invalidated.<br>
1040<b>Complexity:</b> <code>O(rel(position,first,last))</code>.<br>
1041<b>Exception safety:</b> <code>nothrow</code>.<br>
1042</blockquote>
1043
1044<a name="rearrange"><code>template&lt;typename InputIterator> void rearrange(InputIterator first);</code></a>
1045
1046<blockquote>
1047<b>Requires:</b> The range [<code>first</code>,
1048<code>std::advance(first,n)</code>),
1049where <code>n</code> is the size of the index, is a
1050<a href="indices.html#views">free view</a> of the index.<br>
1051<b>Effects:</b> The elements are rearranged so as to match the
1052order of the previously described view.<br>
1053<b>Postconditions:</b> No iterator or reference is invalidated.<br>
1054<b>Complexity:</b> <code>O(n)</code>.<br>
1055<b>Exception safety:</b> Basic.<br>
1056</blockquote>
1057
1058<h4><a name="serialization">Serialization</a></h4>
1059
1060<p>
1061Indices cannot be serialized on their own, but only as part of the
1062<code>multi_index_container</code> into which they are embedded. In describing
1063the additional preconditions and guarantees associated to random access indices
1064with respect to serialization of their embedding containers, we
1065use the concepts defined in the <code>multi_index_container</code>
1066<a href="multi_index_container.html#serialization">serialization section</a>.
1067</p>
1068
1069Operation: saving of a <code>multi_index_container</code> <code>m</code> to an
1070output archive (XML archive) <code>ar</code>.
1071
1072<blockquote>
1073<b>Requires:</b> No additional requirements to those imposed by the container.
1074</blockquote>
1075
1076Operation: loading of a <code>multi_index_container</code> <code>m'</code> from an
1077input archive (XML archive) <code>ar</code>.
1078
1079<blockquote>
1080<b>Requires:</b> No additional requirements to those imposed by the container.<br>
1081<b>Postconditions:</b> On successful loading, each of the elements of
1082[<code>begin()</code>, <code>end()</code>) is a restored copy of the corresponding
1083element in [<code>m.get&lt;i&gt;().begin()</code>, <code>m.get&lt;i&gt;().end()</code>),
1084where <code>i</code> is the position of the random access index in the container.
1085</blockquote>
1086
1087Operation: saving of an <code>iterator</code> or <code>const_iterator</code>
1088<code>it</code> to an output archive (XML archive) <code>ar</code>.
1089
1090<blockquote>
1091<b>Requires:</b> <code>it</code> is a valid iterator of the index. The associated
1092<code>multi_index_container</code> has been previously saved.
1093</blockquote>
1094
1095Operation: loading of an <code>iterator</code> or <code>const_iterator</code>
1096<code>it'</code> from an input archive (XML archive) <code>ar</code>.
1097
1098<blockquote>
1099<b>Postconditions:</b> On successful loading, if <code>it</code> was dereferenceable
1100then <code>*it'</code> is the restored copy of <code>*it</code>, otherwise
1101<code>it'==end()</code>.<br>
1102<b>Note:</b> It is allowed that <code>it</code> be a <code>const_iterator</code>
1103and the restored <code>it'</code> an <code>iterator</code>, or viceversa.
1104</blockquote>
1105
1106<hr>
1107
1108<div class="prev_link"><a href="seq_indices.html"><img src="../prev.gif" alt="sequenced indices" border="0"><br>
1109Sequenced indices
1110</a></div>
1111<div class="up_link"><a href="index.html"><img src="../up.gif" alt="Boost.MultiIndex reference" border="0"><br>
1112Boost.MultiIndex reference
1113</a></div>
1114<div class="next_link"><a href="key_extraction.html"><img src="../next.gif" alt="key extraction" border="0"><br>
1115Key extraction
1116</a></div><br clear="all" style="clear: all;">
1117
1118<br>
1119
1120<p>Revised November 26th 2015</p>
1121
1122<p>&copy; Copyright 2003-2015 Joaqu&iacute;n M L&oacute;pez Mu&ntilde;oz.
1123Distributed under the Boost Software
1124License, Version 1.0. (See accompanying file <a href="../../../../LICENSE_1_0.txt">
1125LICENSE_1_0.txt</a> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">
1126http://www.boost.org/LICENSE_1_0.txt</a>)
1127</p>
1128
1129</body>
1130</html>
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