1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>deque</title>
<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
<link rel="home" href="../../index.html" title="Chapter 1. Fusion 2.2">
<link rel="up" href="../container.html" title="Container">
<link rel="prev" href="list.html" title="list">
<link rel="next" href="front_extended_deque.html" title="front_extended_deque">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr>
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../index.html">Home</a></td>
<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td>
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
<td align="center"><a href="../../../../../../more/index.htm">More</a></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="list.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../container.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="front_extended_deque.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="fusion.container.deque"></a><a class="link" href="deque.html" title="deque">deque</a>
</h3></div></div></div>
<h5>
<a name="fusion.container.deque.h0"></a>
<span class="phrase"><a name="fusion.container.deque.description"></a></span><a class="link" href="deque.html#fusion.container.deque.description">Description</a>
</h5>
<p>
<code class="computeroutput"><span class="identifier">deque</span></code> is a simple <a class="link" href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
Sequence</a> that supports constant-time insertion and removal of elements
at both ends. Like the <a class="link" href="list.html" title="list"><code class="computeroutput"><span class="identifier">list</span></code></a> and <a class="link" href="cons.html" title="cons"><code class="computeroutput"><span class="identifier">cons</span></code></a>, <code class="computeroutput"><span class="identifier">deque</span></code>
is more efficient than <a class="link" href="vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a> (especially at compile time)
when the target sequence is constructed piecemeal (a data at a time, e.g.
when constructing expression templates). Like the <a class="link" href="list.html" title="list"><code class="computeroutput"><span class="identifier">list</span></code></a> and <a class="link" href="cons.html" title="cons"><code class="computeroutput"><span class="identifier">cons</span></code></a>, runtime cost of access to
each element is peculiarly constant (see <a class="link" href="../notes.html#fusion.notes.recursive_inlined_functions">Recursive
Inlined Functions</a>).
</p>
<p>
Element insertion and removal are done by special <code class="computeroutput"><span class="identifier">deque</span></code>
helper classes <a class="link" href="front_extended_deque.html" title="front_extended_deque"><code class="computeroutput"><span class="identifier">front_extended_deque</span></code></a> and <a class="link" href="back_extended_deque.html" title="back_extended_deque"><code class="computeroutput"><span class="identifier">back_extended_deque</span></code></a>.
</p>
<h5>
<a name="fusion.container.deque.h1"></a>
<span class="phrase"><a name="fusion.container.deque.header"></a></span><a class="link" href="deque.html#fusion.container.deque.header">Header</a>
</h5>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">deque</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">deque</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">container</span><span class="special">/</span><span class="identifier">list</span><span class="special">/</span><span class="identifier">deque_fwd</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">deque_fwd</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
</pre>
<h5>
<a name="fusion.container.deque.h2"></a>
<span class="phrase"><a name="fusion.container.deque.synopsis"></a></span><a class="link" href="deque.html#fusion.container.deque.synopsis">Synopsis</a>
</h5>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="special">...</span><span class="identifier">Elements</span><span class="special">></span>
<span class="keyword">struct</span> <span class="identifier">deque</span><span class="special">;</span>
</pre>
<p>
For C++11 compilers, the variadic class interface has no upper bound.
</p>
<p>
For C++03 compilers, the variadic class interface accepts <code class="computeroutput"><span class="number">0</span></code>
to <code class="computeroutput"><span class="identifier">FUSION_MAX_DEQUE_SIZE</span></code>
elements, where <code class="computeroutput"><span class="identifier">FUSION_MAX_DEQUE_SIZE</span></code>
is a user definable predefined maximum that defaults to <code class="computeroutput"><span class="number">10</span></code>.
Example:
</p>
<pre class="programlisting"><span class="identifier">deque</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">,</span> <span class="keyword">double</span><span class="special">></span>
</pre>
<p>
You may define the preprocessor constant <code class="computeroutput"><span class="identifier">FUSION_MAX_DEQUE_SIZE</span></code>
before including any Fusion header to change the default. Example:
</p>
<pre class="programlisting"><span class="preprocessor">#define</span> <span class="identifier">FUSION_MAX_DEQUE_SIZE</span> <span class="number">20</span>
</pre>
<h5>
<a name="fusion.container.deque.h3"></a>
<span class="phrase"><a name="fusion.container.deque.template_parameters"></a></span><a class="link" href="deque.html#fusion.container.deque.template_parameters">Template
parameters</a>
</h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Description
</p>
</th>
<th>
<p>
Default
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">Elements</span></code>
</p>
</td>
<td>
<p>
Element types
</p>
</td>
<td>
</td>
</tr></tbody>
</table></div>
<h5>
<a name="fusion.container.deque.h4"></a>
<span class="phrase"><a name="fusion.container.deque.model_of"></a></span><a class="link" href="deque.html#fusion.container.deque.model_of">Model
of</a>
</h5>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<a class="link" href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
Sequence</a>
</li></ul></div>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="identifier">D</span></code></span></dt>
<dd><p>
A <code class="computeroutput"><span class="identifier">deque</span></code> type
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">d</span></code>, <code class="computeroutput"><span class="identifier">d2</span></code></span></dt>
<dd><p>
Instances of <code class="computeroutput"><span class="identifier">deque</span></code>
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">e0</span></code>...<code class="computeroutput"><span class="identifier">en</span></code></span></dt>
<dd><p>
Heterogeneous values
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt>
<dd><p>
A <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
Sequence</a>
</p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">N</span></code></span></dt>
<dd><p>
An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
Integral Constant</a>
</p></dd>
</dl>
</div>
<h5>
<a name="fusion.container.deque.h5"></a>
<span class="phrase"><a name="fusion.container.deque.expression_semantics"></a></span><a class="link" href="deque.html#fusion.container.deque.expression_semantics">Expression
Semantics</a>
</h5>
<p>
Semantics of an expression is defined only where it differs from, or is not
defined in <a class="link" href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
Sequence</a>.
</p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Expression
</p>
</th>
<th>
<p>
Semantics
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">D</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
Creates a deque with default constructed elements.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">D</span><span class="special">(</span><span class="identifier">e0</span><span class="special">,</span>
<span class="identifier">e1</span><span class="special">,...</span>
<span class="identifier">en</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
Creates a deque with elements <code class="computeroutput"><span class="identifier">e0</span></code>...<code class="computeroutput"><span class="identifier">en</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">D</span><span class="special">(</span><span class="identifier">s</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
Copy constructs a deque from a <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
Sequence</a>, <code class="computeroutput"><span class="identifier">s</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">d</span> <span class="special">=</span>
<span class="identifier">s</span></code>
</p>
</td>
<td>
<p>
Assigns to a deque, <code class="computeroutput"><span class="identifier">d</span></code>,
from a <a class="link" href="../sequence/concepts/forward_sequence.html" title="Forward Sequence">Forward
Sequence</a>, <code class="computeroutput"><span class="identifier">s</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><a class="link" href="../sequence/intrinsic/functions/at.html" title="at"><code class="computeroutput"><span class="identifier">at</span></code></a><span class="special"><</span><span class="identifier">N</span><span class="special">>(</span><span class="identifier">d</span><span class="special">)</span></code>
</p>
</td>
<td>
<p>
The Nth element from the beginning of the sequence; see <a class="link" href="../sequence/intrinsic/functions/at.html" title="at"><code class="computeroutput"><span class="identifier">at</span></code></a>.
</p>
</td>
</tr>
</tbody>
</table></div>
<div class="sidebar">
<div class="titlepage"></div>
<p>
<span class="inlinemediaobject"><img src="../../images/note.png" alt="note"></span> <code class="computeroutput"><a class="link" href="../sequence/intrinsic/functions/at.html" title="at"><code class="computeroutput"><span class="identifier">at</span></code></a><span class="special"><</span><span class="identifier">N</span><span class="special">>(</span><span class="identifier">d</span><span class="special">)</span></code> is provided
for convenience, despite <code class="computeroutput"><span class="identifier">deque</span></code>
being a <a class="link" href="../sequence/concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
Sequence</a> only (<code class="computeroutput"><span class="identifier">at</span></code>
is supposed to be a <a class="link" href="../sequence/concepts/random_access_sequence.html" title="Random Access Sequence">Random
Access Sequence</a> requirement). The runtime complexity of <a class="link" href="../sequence/intrinsic/functions/at.html" title="at"><code class="computeroutput"><span class="identifier">at</span></code></a> is constant (see <a class="link" href="../notes.html#fusion.notes.recursive_inlined_functions">Recursive
Inlined Functions</a>). <code class="computeroutput"><span class="identifier">deque</span></code>
element access utilizes operator overloading with argument dependent lookup
(ADL) of the proper element getter function given a static constant index
parameter. Interestingly, with modern C++ compilers, this lookup is very
fast and rivals recursive template instantiations in compile time-speed,
so much so that <code class="computeroutput"><span class="identifier">deque</span></code> relies
on ADL for all element access (indexing) as well as iteration.
</p>
</div>
<h5>
<a name="fusion.container.deque.h6"></a>
<span class="phrase"><a name="fusion.container.deque.example"></a></span><a class="link" href="deque.html#fusion.container.deque.example">Example</a>
</h5>
<pre class="programlisting"><span class="identifier">deque</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">float</span><span class="special">></span> <span class="identifier">d</span><span class="special">(</span><span class="number">12</span><span class="special">,</span> <span class="number">5.5f</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <a class="link" href="../sequence/intrinsic/functions/at_c.html" title="at_c"><code class="computeroutput"><span class="identifier">at_c</span></code></a><span class="special"><</span><span class="number">0</span><span class="special">>(</span><span class="identifier">d</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <a class="link" href="../sequence/intrinsic/functions/at_c.html" title="at_c"><code class="computeroutput"><span class="identifier">at_c</span></code></a><span class="special"><</span><span class="number">1</span><span class="special">>(</span><span class="identifier">d</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2006, 2011, 2012 Joel de Guzman,
Dan Marsden, Tobias Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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>)
</p>
</div></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="list.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../container.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="front_extended_deque.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
</div>
</body>
</html>
|
