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
|
<html>
<head>
<title>BOOST_PP_SEQ_FIRST_N</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<div style="margin-left: 0px;">
The <b>BOOST_PP_SEQ_FIRST_N</b> macro expands to a <i>seq</i> of the first <i>n</i>
elements of a <i>seq</i>.
</div>
<h4>
Usage
</h4>
<div class="code">
<b>BOOST_PP_SEQ_FIRST_N</b>(<i>n</i>, <i>list</i>)
</div>
<h4>
Arguments
</h4>
<dl>
<dt>n</dt>
<dd>
The number of elements to extract.
</dd>
<dt>list</dt>
<dd>
The <i>seq</i> from which the elements are extracted.
</dd>
</dl>
<h4>
Remarks
</h4>
<div>
This macro extracts <i>n</i> elements from the beginning of <i>seq</i> and
returns them as a new <i>seq</i>
</div>
<h4>
See Also
</h4>
<ul>
<li>
<a href="seq_rest_n.html">BOOST_PP_SEQ_REST_N</a></li>
</ul>
<h4>
Requirements
</h4>
<div>
<b>Header:</b> <a href="../headers/seq/first_n.html"><boost/preprocessor/seq/first_n.hpp></a>
</div>
<h4>
Sample Code
</h4>
<div>
<pre>
#include <<a href="../headers/seq/first_n.html">boost/preprocessor/seq/first_n.hpp</a>>
#define SEQ (a)(b)(c)(d)(e)
<a href="seq_first_n.html">BOOST_PP_SEQ_FIRST_N</a>(2, SEQ) // expands to (a)(b)
</pre>
</div>
</body>
</html>
|
