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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Algorithm Tuning</title>
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<link rel="start" href="../../index.html" title="Boost.Regex">
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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="../../../../../../libs/libraries.htm">Libraries</a></td>
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<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
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<td align="center"><a href="../../../../../../more/index.htm">More</a></td>
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<div class="spirit-nav">
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<a accesskey="p" href="algorithm.html"><img src="../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../configuration.html"><img src="../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="../install.html"><img src="../../../../../../doc/html/images/next.png" alt="Next"></a>
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</div>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_regex.configuration.tuning"></a><a 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 are
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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 to
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4096 bytes, which is large enough to match the vast majority of regular
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expressions without further allocations, however, you can choose
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smaller or larger values depending upon your platforms 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 it
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is permitted to use. If this value is exceeded then Boost.Regex will
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stop trying to find a match and throw a std::runtime_error. Defaults
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to 1024, don't forget to tweek this value if you alter BOOST_REGEX_BLOCKSIZE
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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 calling
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::operator new. Generally speeking this can be an order of magnitude
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faster than calling ::opertator new each time a memory block is required,
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but has the downside that Boost.Regex can end up caching a large
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chunk of memory (by default up to 16 blocks each of BOOST_REGEX_BLOCKSIZE
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size). If memory is tight then try defining this to 0 (disables all
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caching), or if that is too slow, then a value of 1 or 2, may be
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sufficient. On the other hand, on large multi-processor, multi-threaded
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systems, you may find that 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 <20> 1998 -2007 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/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../configuration.html"><img src="../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="../install.html"><img src="../../../../../../doc/html/images/next.png" alt="Next"></a>
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