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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_pool.pool.introduction"></a><a class="link" href="introduction.html" title="Introduction">Introduction</a> |
| </h3></div></div></div> |
| <h6> |
| <a name="boost_pool.pool.introduction.h0"></a> |
| <span><a name="boost_pool.pool.introduction.what_is_pool_"></a></span><a class="link" href="introduction.html#boost_pool.pool.introduction.what_is_pool_">What |
| is Pool?</a> |
| </h6> |
| <p> |
| Pool allocation is a memory allocation scheme that is very fast, but limited |
| in its usage. For more information on pool allocation (also called <span class="emphasis"><em>simple |
| segregated storage</em></span>, see <a class="link" href="pooling.html#boost_pool.pool.pooling.concepts" title="Basic ideas behind pooling">concepts</a> |
| concepts and <a class="link" href="pooling.html#boost_pool.pool.pooling.simple" title="Simple Segregated Storage">Simple Segregated |
| Storage</a>). |
| </p> |
| <h6> |
| <a name="boost_pool.pool.introduction.h1"></a> |
| <span><a name="boost_pool.pool.introduction.why_should_i_use_pool_"></a></span><a class="link" href="introduction.html#boost_pool.pool.introduction.why_should_i_use_pool_">Why |
| should I use Pool?</a> |
| </h6> |
| <p> |
| Using Pools gives you more control over how memory is used in your program. |
| For example, you could have a situation where you want to allocate a bunch |
| of small objects at one point, and then reach a point in your program where |
| none of them are needed any more. Using pool interfaces, you can choose to |
| run their destructors or just drop them off into oblivion; the pool interface |
| will guarantee that there are no system memory leaks. |
| </p> |
| <h6> |
| <a name="boost_pool.pool.introduction.h2"></a> |
| <span><a name="boost_pool.pool.introduction.when_should_i_use_pool_"></a></span><a class="link" href="introduction.html#boost_pool.pool.introduction.when_should_i_use_pool_">When should |
| I use Pool?</a> |
| </h6> |
| <p> |
| Pools are generally used when there is a lot of allocation and deallocation |
| of small objects. Another common usage is the situation above, where many |
| objects may be dropped out of memory. |
| </p> |
| <p> |
| In general, use Pools when you need a more efficient way to do unusual memory |
| control. |
| </p> |
| <h6> |
| <a name="boost_pool.pool.introduction.h3"></a> |
| <span><a name="boost_pool.pool.introduction.which_pool_allocator_should_i_use_"></a></span><a class="link" href="introduction.html#boost_pool.pool.introduction.which_pool_allocator_should_i_use_">Which |
| pool allocator should I use?</a> |
| </h6> |
| <p> |
| <code class="computeroutput"><span class="identifier">pool_allocator</span></code> is a more |
| general-purpose solution, geared towards efficiently servicing requests for |
| any number of contiguous chunks. |
| </p> |
| <p> |
| <code class="computeroutput"><span class="identifier">fast_pool_allocator</span></code> is also |
| a general-purpose solution but is geared towards efficiently servicing requests |
| for one chunk at a time; it will work for contiguous chunks, but not as well |
| as pool_allocator. |
| </p> |
| <p> |
| If you are seriously concerned about performance, use <code class="computeroutput"><span class="identifier">fast_pool_allocator</span></code> |
| when dealing with containers such as <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">list</span></code>, |
| and use <code class="computeroutput"><span class="identifier">pool_allocator</span></code> when |
| dealing with containers such as <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span></code>. |
| </p> |
| </div> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2000-2006 Stephen Cleary<br>Copyright © 2011 Paul A. Bristow<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>) |
| </p> |
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