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15<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./concepts.html" class="navigation-link">Concepts</a> / <a href="./forward-sequence.html" class="navigation-link">Forward Sequence</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="forward-sequence">
18<h1><a class="toc-backref" href="./concepts.html#id324" name="forward-sequence">Forward Sequence</a></h1>
19<div class="section" id="description">
20<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
21<p>A <a class="reference" href="./forward-sequence.html">Forward Sequence</a> is an MPL concept representing a compile-time sequence of
22elements. Sequence elements are
23types, and are accessible through <a class="reference" href="./iterators.html">Iterators</a>. The <a class="refentry reference" href="./begin.html"><tt class="refentry literal"><span class="pre">begin</span></tt></a> and <a class="refentry reference" href="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a> metafunctions
24provide iterators delimiting the range of the sequence
25elements.  A sequence guarantees that its elements are arranged in a definite,
26but possibly unspecified, order. Every MPL sequence is a <a class="reference" href="./forward-sequence.html">Forward Sequence</a>.</p>
27</div>
28<div class="section" id="definitions">
29<h3><a class="subsection-title" href="#definitions" name="definitions">Definitions</a></h3>
30<ul class="simple">
31<li>The <em>size</em> of a sequence is the number of elements it contains. The size is a
32nonnegative number.</li>
33<li>A sequence is <em>empty</em> if its size is zero.</li>
34</ul>
35</div>
36<div class="section" id="expression-requirements">
37<h3><a class="subsection-title" href="#expression-requirements" name="expression-requirements">Expression requirements</a></h3>
38<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following expressions must be valid:</p>
39<table border="1" class="table">
40<colgroup>
41<col width="30%" />
42<col width="39%" />
43<col width="30%" />
44</colgroup>
45<thead valign="bottom">
46<tr><th>Expression</th>
47<th>Type</th>
48<th>Complexity</th>
49</tr>
50</thead>
51<tbody valign="top">
52<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt></td>
53<td><a class="reference" href="./forward-iterator.html">Forward Iterator</a></td>
54<td>Amortized constant time</td>
55</tr>
56<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt></td>
57<td><a class="reference" href="./forward-iterator.html">Forward Iterator</a></td>
58<td>Amortized constant time</td>
59</tr>
60<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::type</span></tt></td>
61<td><a class="reference" href="./integral-constant.html">Integral Constant</a></td>
62<td>Unspecified</td>
63</tr>
64<tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a>&lt;s&gt;::type</span></tt></td>
65<td>Boolean <a class="reference" href="./integral-constant.html">Integral Constant</a></td>
66<td>Constant time</td>
67</tr>
68<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a>&lt;s&gt;::type</span></tt></td>
69<td>Any type</td>
70<td>Amortized constant time</td>
71</tr>
72</tbody>
73</table>
74</div>
75<div class="section" id="expression-semantics">
76<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
77<table border="1" class="table">
78<colgroup>
79<col width="28%" />
80<col width="72%" />
81</colgroup>
82<thead valign="bottom">
83<tr><th>Expression</th>
84<th>Semantics</th>
85</tr>
86</thead>
87<tbody valign="top">
88<tr><td><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt></td>
89<td>An iterator to the first element of the sequence; see <a class="refentry reference" href="./begin.html"><tt class="refentry literal"><span class="pre">begin</span></tt></a>.</td>
90</tr>
91<tr><td><tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt></td>
92<td>A past-the-end iterator to the sequence; see <a class="refentry reference" href="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a>.</td>
93</tr>
94<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::type</span></tt></td>
95<td>The size of the sequence; see <a class="refentry reference" href="./size.html"><tt class="refentry literal"><span class="pre">size</span></tt></a>.</td>
96</tr>
97<tr><td><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a>&lt;s&gt;::type</span></tt></td>
98<td>A boolean <a class="reference" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> such that
99<tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only if the sequence is empty; see <a class="refentry reference" href="./empty.html"><tt class="refentry literal"><span class="pre">empty</span></tt></a>.</td>
100</tr>
101<tr><td><tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a>&lt;s&gt;::type</span></tt></td>
102<td>The first element in the sequence; see <a class="refentry reference" href="./front.html"><tt class="refentry literal"><span class="pre">front</span></tt></a>.</td>
103</tr>
104</tbody>
105</table>
106</div>
107<div class="section" id="invariants">
108<h3><a class="subsection-title" href="#invariants" name="invariants">Invariants</a></h3>
109<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt> the following invariants always hold:</p>
110<ul class="simple">
111<li>[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>) is always a valid range.</li>
112<li>An algorithm that iterates through the range [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt>)
113will pass through every element of <tt class="literal"><span class="pre">s</span></tt> exactly once.</li>
114<li><tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type</span></tt> is identical to <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;s&gt;::type</span></tt> if and only if <tt class="literal"><span class="pre">s</span></tt> is empty.</li>
115<li>Two different iterations through <tt class="literal"><span class="pre">s</span></tt> will access its elements in the same order.</li>
116</ul>
117</div>
118<div class="section" id="models">
119<h3><a class="subsection-title" href="#models" name="models">Models</a></h3>
120<ul class="simple">
121<li><a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a></li>
122<li><a class="refentry reference" href="./map.html"><tt class="refentry literal"><span class="pre">map</span></tt></a></li>
123<li><a class="refentry reference" href="./range-c.html"><tt class="refentry literal"><span class="pre">range_c</span></tt></a></li>
124<li><a class="refentry reference" href="./iterator-range.html"><tt class="refentry literal"><span class="pre">iterator_range</span></tt></a></li>
125<li><a class="refentry reference" href="./filter-view.html"><tt class="refentry literal"><span class="pre">filter_view</span></tt></a></li>
126</ul>
127</div>
128<div class="section" id="see-also">
129<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
130<p><a class="reference" href="./sequences.html">Sequences</a>, <a class="reference" href="./bidirectional-sequence.html">Bidirectional Sequence</a>, <a class="reference" href="./forward-iterator.html">Forward Iterator</a>, <a class="refentry reference" href="./begin.html"><tt class="refentry literal"><span class="pre">begin</span></tt></a> / <a class="refentry reference" href="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a>, <a class="refentry reference" href="./size.html"><tt class="refentry literal"><span class="pre">size</span></tt></a>, <a class="refentry reference" href="./empty.html"><tt class="refentry literal"><span class="pre">empty</span></tt></a>, <a class="refentry reference" href="./front.html"><tt class="refentry literal"><span class="pre">front</span></tt></a></p>
131<!-- modtime: November 13, 2004 00:38:50 +0000 -->
132<!-- Sequences/Concepts//Bidirectional Sequence |20 -->
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