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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_regex.configuration.tuning"></a><a class="link" href="tuning.html" title="Algorithm Tuning">Algorithm Tuning</a>
</h3></div></div></div>
<p>
The following option applies only if BOOST_REGEX_RECURSIVE is set.
</p>
<div class="informaltable"><table class="table">
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<p>
macro
</p>
</th>
<th>
<p>
description
</p>
</th>
</tr></thead>
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<td>
<p>
BOOST_REGEX_HAS_MS_STACK_GUARD
</p>
</td>
<td>
<p>
Tells Boost.Regex that Microsoft style __try - __except blocks
are supported, and can be used to safely trap stack overflow.
</p>
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</tr></tbody>
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<p>
The following options apply only if BOOST_REGEX_NON_RECURSIVE is set.
</p>
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macro
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<td>
<p>
BOOST_REGEX_BLOCKSIZE
</p>
</td>
<td>
<p>
In non-recursive mode, Boost.Regex uses largish blocks of memory
to act as a stack for the state machine, the larger the block size
then the fewer allocations that will take place. This defaults
to 4096 bytes, which is large enough to match the vast majority
of regular expressions without further allocations, however, you
can choose smaller or larger values depending upon your platforms
characteristics.
</p>
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<p>
BOOST_REGEX_MAX_BLOCKS
</p>
</td>
<td>
<p>
Tells Boost.Regex how many blocks of size BOOST_REGEX_BLOCKSIZE
it is permitted to use. If this value is exceeded then Boost.Regex
will stop trying to find a match and throw a std::runtime_error.
Defaults to 1024, don't forget to tweak this value if you alter
BOOST_REGEX_BLOCKSIZE by much.
</p>
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<p>
BOOST_REGEX_MAX_CACHE_BLOCKS
</p>
</td>
<td>
<p>
Tells Boost.Regex how many memory blocks to store in it's internal
cache - memory blocks are taken from this cache rather than by
calling ::operator new. Generally speaking this can be an order
of magnitude faster than calling ::opertator new each time a memory
block is required, but has the downside that Boost.Regex can end
up caching a large chunk of memory (by default up to 16 blocks
each of BOOST_REGEX_BLOCKSIZE size). If memory is tight then try
defining this to 0 (disables all caching), or if that is too slow,
then a value of 1 or 2, may be sufficient. On the other hand, on
large multi-processor, multi-threaded systems, you may find that
a higher value is in order.
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<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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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