157 lines
6.3 KiB
HTML
157 lines
6.3 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>Algorithm Tuning</title>
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<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="../../index.html" title="Boost.Regex 5.1.4">
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<link rel="up" href="../configuration.html" title="Configuration">
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<link rel="prev" href="algorithm.html" title="Algorithm Selection">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr>
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<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td>
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<td align="center"><a href="../../../../../../index.html">Home</a></td>
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<td align="center"><a href="../../../../../../more/index.htm">More</a></td>
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<a accesskey="p" href="algorithm.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../configuration.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="../install.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_regex.configuration.tuning"></a><a class="link" href="tuning.html" title="Algorithm Tuning">Algorithm Tuning</a>
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</h3></div></div></div>
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<p>
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The following option applies only if BOOST_REGEX_RECURSIVE is set.
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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macro
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</p>
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</th>
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<th>
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<p>
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description
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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BOOST_REGEX_HAS_MS_STACK_GUARD
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</p>
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</td>
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<td>
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<p>
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Tells Boost.Regex that Microsoft style __try - __except blocks
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are supported, and can be used to safely trap stack overflow.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<p>
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The following options apply only if BOOST_REGEX_NON_RECURSIVE is set.
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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macro
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</p>
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</th>
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<th>
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<p>
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description
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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BOOST_REGEX_BLOCKSIZE
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</p>
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</td>
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<td>
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<p>
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In non-recursive mode, Boost.Regex uses largish blocks of memory
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to act as a stack for the state machine, the larger the block size
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then the fewer allocations that will take place. This defaults
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to 4096 bytes, which is large enough to match the vast majority
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of regular expressions without further allocations, however, you
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can choose smaller or larger values depending upon your platforms
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characteristics.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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BOOST_REGEX_MAX_BLOCKS
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</p>
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</td>
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<td>
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<p>
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Tells Boost.Regex how many blocks of size BOOST_REGEX_BLOCKSIZE
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it is permitted to use. If this value is exceeded then Boost.Regex
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will stop trying to find a match and throw a std::runtime_error.
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Defaults to 1024, don't forget to tweak this value if you alter
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BOOST_REGEX_BLOCKSIZE by much.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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BOOST_REGEX_MAX_CACHE_BLOCKS
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</p>
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</td>
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<td>
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<p>
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Tells Boost.Regex how many memory blocks to store in it's internal
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cache - memory blocks are taken from this cache rather than by
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calling ::operator new. Generally speaking this can be an order
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of magnitude faster than calling ::opertator new each time a memory
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block is required, but has the downside that Boost.Regex can end
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up caching a large chunk of memory (by default up to 16 blocks
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each of BOOST_REGEX_BLOCKSIZE size). If memory is tight then try
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defining this to 0 (disables all caching), or if that is too slow,
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then a value of 1 or 2, may be sufficient. On the other hand, on
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large multi-processor, multi-threaded systems, you may find that
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a higher value is in order.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="algorithm.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../configuration.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="../install.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
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