84 lines
3.3 KiB
HTML
84 lines
3.3 KiB
HTML
|
<html>
|
|||
|
|
<head>
|
|||
|
|
<title>BOOST_PP_ITERATE</title>
|
|||
|
|
<link rel="stylesheet" type="text/css" href="../styles.css">
|
|||
|
|
</head>
|
|||
|
|
<body>
|
|||
|
|
<div style="margin-left: 0px;">
|
|||
|
|
The <b>BOOST_PP_ITERATE</b> macro initiates a <i>file-iteration</i>.
|
|||
|
|
</div>
|
|||
|
|
<h4>Usage</h4>
|
|||
|
|
<div class="code">
|
|||
|
|
#include <b>BOOST_PP_ITERATE</b>()
|
|||
|
|
</div>
|
|||
|
|
<h4>Remarks</h4>
|
|||
|
|
<div>
|
|||
|
|
Arguments to this macro are passed as <i>external named arguments</i> in one of two
|
|||
|
|
ways--either through <b>BOOST_PP_FILENAME_<i>x</i></b> and <b>BOOST_PP_ITERATION_LIMITS</b> <i>or</i>
|
|||
|
|
through <b>BOOST_PP_ITERATION_PARAMS_<i>x</i></b>.
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
Three pieces of information are required to perform a <i>file-iteration</i>.
|
|||
|
|
First, the name of a file to iterate over.
|
|||
|
|
This is passed via <b>BOOST_PP_FILENAME_<i>x</i></b> <i>or</i> as part of <b>BOOST_PP_ITERATION_PARAMS_<i>x</i></b>.
|
|||
|
|
The <i>file-iteration</i> mechanism will repeatedly include this file with iteration values ranging from a lower bound to an upper bound--the second and third <i>required</i> parameters.
|
|||
|
|
These two boundaries are either passed through <b>BOOST_PP_ITERATION_LIMITS</b> <i>or</i> as part of <b>BOOST_PP_ITERATION_PARAMS_<i>x</i></b>.
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
Optionally, a fourth parameter may be passed that associates flags with an iteration.
|
|||
|
|
These flags are primarily useful to distinguish one iteration from another in the same file.
|
|||
|
|
This parameter can only be passed through <b>BOOST_PP_ITERATION_PARAMS_<i>x</i></b>.
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
While a <i>file-iteration</i> is in progress, <b>BOOST_PP_IS_ITERATING</b> is defined as <i>1</i>.
|
|||
|
|
</div>
|
|||
|
|
<h4>See Also</h4>
|
|||
|
|
<ul>
|
|||
|
|
<li><a href="filename_x.html">BOOST_PP_FILENAME_<i>x</i></a></li>
|
|||
|
|
<li><a href="is_iterating.html">BOOST_PP_IS_ITERATING</a></li>
|
|||
|
|
<li><a href="iteration_limits.html">BOOST_PP_ITERATION_LIMITS</a></li>
|
|||
|
|
<li><a href="iteration_params_x.html">BOOST_PP_ITERATION_PARAMS_<i>x</i></a></li>
|
|||
|
|
</ul>
|
|||
|
|
<h4>Requirements</h4>
|
|||
|
|
<div>
|
|||
|
|
<b>Header:</b> <a href="../headers/iteration/iterate.html"><boost/preprocessor/iteration/iterate.hpp></a>
|
|||
|
|
</div>
|
|||
|
|
<h4>Sample Code</h4>
|
|||
|
|
<div><pre>
|
|||
|
|
// file.h
|
|||
|
|
#if !<a href="is_iterating.html">BOOST_PP_IS_ITERATING</a>
|
|||
|
|
|
|||
|
|
#ifndef FILE_H_
|
|||
|
|
#define FILE_H_
|
|||
|
|
|
|||
|
|
#include <<a href="../headers/iteration/iterate.html">boost/preprocessor/iteration/iterate.hpp</a>>
|
|||
|
|
|
|||
|
|
#define <a href="iteration_params_x.html">BOOST_PP_ITERATION_PARAMS_1</a> (3, (1, 10, "file.h"))
|
|||
|
|
#include <a href="iterate.html">BOOST_PP_ITERATE</a>()
|
|||
|
|
|
|||
|
|
#define <a href="filename_x.html">BOOST_PP_FILENAME_1</a> "file.h"
|
|||
|
|
#define <a href="iteration_limits.html">BOOST_PP_ITERATION_LIMITS</a> (11, 20)
|
|||
|
|
#include <a href="iterate.html">BOOST_PP_ITERATE</a>()
|
|||
|
|
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
#else
|
|||
|
|
|
|||
|
|
current iteration value is <a href="iteration.html">BOOST_PP_ITERATION</a>()
|
|||
|
|
|
|||
|
|
#endif
|
|||
|
|
</pre></div>
|
|||
|
|
<hr size="1">
|
|||
|
|
<div style="margin-left: 0px;">
|
|||
|
|
<i><EFBFBD> Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
|
|||
|
|
</br><i><EFBFBD> Copyright Paul Mensonides 2002</i>
|
|||
|
|
</div>
|
|||
|
|
<div style="margin-left: 0px;">
|
|||
|
|
<p><small>Distributed under the Boost Software License, Version 1.0. (See
|
|||
|
|
accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
|
|||
|
|
copy at <a href=
|
|||
|
|
"http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|