mirror of
https://github.com/boostorg/pool.git
synced 2026-01-25 06:22:14 +00:00
d88008b987
that use it are valid. Merged revisions 53047-53048 via svnmerge from https://svn.boost.org/svn/boost/trunk ........ r53047 | danieljames | 2009-05-16 15:17:20 +0100 (Sat, 16 May 2009) | 1 line Fix some validation errors. ........ r53048 | danieljames | 2009-05-16 15:23:59 +0100 (Sat, 16 May 2009) | 1 line Use a local copy of the valid HTML 4.01 icon. ........ [SVN r53258]
288 lines
7.4 KiB
HTML
288 lines
7.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
|
|
"http://www.w3.org/TR/html4/loose.dtd">
|
|
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Language" content="en-us">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
|
|
<link href="../pool.css" rel="stylesheet" type="text/css">
|
|
|
|
<title>object_pool - Boost Object Pool Allocator</title>
|
|
</head>
|
|
|
|
<body>
|
|
<img src="../../../../boost.png" width="276" height="86" alt="C++ Boost">
|
|
|
|
<h1 align="center">object_pool - Boost Object Pool Allocator</h1>
|
|
|
|
<h2>Introduction</h2>
|
|
|
|
<p>object_pool.hpp provides a template type that can be used for fast and
|
|
efficient memory allocation. It also provides automatic destruction of
|
|
non-deallocated objects. For information on other pool-based interfaces, see <a href="../interfaces.html">
|
|
the other pool interfaces</a>.</p>
|
|
|
|
<h2>Synopsis</h2>
|
|
<pre class="code">
|
|
template <typename ElementType, typename UserAllocator = default_user_allocator_new_delete>
|
|
class object_pool
|
|
{
|
|
private:
|
|
object_pool(const object_pool &);
|
|
void operator=(const object_pool &);
|
|
|
|
public:
|
|
typedef ElementType element_type;
|
|
typedef UserAllocator user_allocator;
|
|
typedef typename pool<UserAllocator>::size_type size_type;
|
|
typedef typename pool<UserAllocator>::difference_type difference_type;
|
|
|
|
object_pool();
|
|
~object_pool();
|
|
|
|
element_type * malloc();
|
|
void free(element_type * p);
|
|
bool is_from(element_type * p) const;
|
|
|
|
element_type * construct();
|
|
// other construct() functions
|
|
void destroy(element_type * p);
|
|
};
|
|
</pre>
|
|
|
|
<h2>Template Parameters</h2>
|
|
|
|
<h3>ElementType</h3>
|
|
|
|
<p>The template parameter is the type of object to allocate/deallocate. It
|
|
must have a non-throwing destructor.</p>
|
|
|
|
<h3>UserAllocator</h3>
|
|
|
|
<p>Defines the method that the underlying Pool will use to allocate memory
|
|
from the system. See <a href="user_allocator.html">User Allocators</a> for
|
|
details.</p>
|
|
|
|
<h2>Semantics</h2>
|
|
|
|
<table border align="center" summary="">
|
|
<caption>
|
|
<em>Symbol Table</em>
|
|
</caption>
|
|
|
|
<tr>
|
|
<th>Symbol</th>
|
|
|
|
<th>Meaning</th>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">ObjectPool</td>
|
|
|
|
<td><span class="code">object_pool<ElementType, UserAllocator></span></td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">t</td>
|
|
|
|
<td>value of type <span class="code">ObjectPool</span></td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">u</td>
|
|
|
|
<td>value of type <span class="code">const ObjectPool</span></td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">p</td>
|
|
|
|
<td>value of type <span class="code">ElementType *</span></td>
|
|
</tr>
|
|
</table><br>
|
|
|
|
<table border align="center" summary="">
|
|
<caption>
|
|
<em>Typedefs</em>
|
|
</caption>
|
|
|
|
<tr>
|
|
<th>Expression</th>
|
|
|
|
<th>Type</th>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">ObjectPool::element_type</td>
|
|
|
|
<td class="code">ElementType</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">ObjectPool::user_allocator</td>
|
|
|
|
<td class="code">UserAllocator</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">ObjectPool::size_type</td>
|
|
|
|
<td class="code">pool<UserAllocator>::size_type</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">ObjectPool::difference_type</td>
|
|
|
|
<td class="code">pool<UserAllocator>::difference_type</td>
|
|
</tr>
|
|
</table><br>
|
|
|
|
<table border align="center" summary="">
|
|
<caption>
|
|
<em>Constructors, Destructors, and Testing</em>
|
|
</caption>
|
|
|
|
<tr>
|
|
<th>Expression</th>
|
|
|
|
<th>Return Type</th>
|
|
|
|
<th>Notes</th>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">ObjectPool()</td>
|
|
|
|
<td>not used</td>
|
|
|
|
<td>Constructs a new empty <span class="code">ObjectPool</span></td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">(&t)->~ObjectPool()</td>
|
|
|
|
<td>not used</td>
|
|
|
|
<td>Destructs the <span class="code">ObjectPool</span>; <span class=
|
|
"code">~ElementType()</span> is called for each allocated ElementType
|
|
that has not been deallocated. O(N).</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">u.is_from(p)</td>
|
|
|
|
<td class="code">bool</td>
|
|
|
|
<td>Returns <span class="code">true</span> if <span class=
|
|
"code">p</span> was allocated from <span class="code">u</span> or may be
|
|
returned as the result of a future allocation from <span class=
|
|
"code">u</span>. Returns <span class="code">false</span> if
|
|
<span class="code">p</span> was allocated from some other pool or may be
|
|
returned as the result of a future allocation from some other pool.
|
|
Otherwise, the return value is meaningless; note that this function may
|
|
<strong>not</strong> be used to reliably test random pointer values.</td>
|
|
</tr>
|
|
</table><br>
|
|
|
|
<table border align="center" summary="">
|
|
<caption>
|
|
<em>Allocation and Deallocation</em>
|
|
</caption>
|
|
|
|
<tr>
|
|
<th>Expression</th>
|
|
|
|
<th>Return Type</th>
|
|
|
|
<th>Pre-Condition</th>
|
|
|
|
<th>Semantic Equivalence</th>
|
|
|
|
<th>Notes</th>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">t.malloc()</td>
|
|
|
|
<td class="code">ElementType *</td>
|
|
|
|
<td></td>
|
|
|
|
<td></td>
|
|
|
|
<td>Allocates memory that can hold an object of type <span class=
|
|
"code">ElementType</span>. If out of memory, returns <span class=
|
|
"code">0</span>. Amortized O(1).</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">t.free(p)</td>
|
|
|
|
<td>not used</td>
|
|
|
|
<td><span class="code">p</span> must have been previously allocated from <span class="code">
|
|
t</span></td>
|
|
|
|
<td></td>
|
|
|
|
<td>Deallocates a chunk of memory. Note that <span class=
|
|
"code">p</span> may not be <span class="code">0</span>. Note that the
|
|
destructor for <span class="code">p</span> is not called. O(N).</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">t.construct(???)</td>
|
|
|
|
<td class="code">ElementType *</td>
|
|
|
|
<td><span class="code">ElementType</span> must have a constructor
|
|
matching <span class="code">???</span>; the number of parameters given
|
|
must not exceed what is supported through <a href=
|
|
"../implementation/pool_construct.html">pool_construct</a></td>
|
|
|
|
<td></td>
|
|
|
|
<td>Allocates and initializes an object of type <span class=
|
|
"code">ElementType</span>. If out of memory, returns <span class=
|
|
"code">0</span>. Amortized O(1).</td>
|
|
</tr>
|
|
|
|
<tr>
|
|
<td class="code">t.destroy(p)</td>
|
|
|
|
<td>not used</td>
|
|
|
|
<td><span class="code">p</span> must have been previously allocated from <span class="code">
|
|
t</span></td>
|
|
|
|
<td class="code">p->~ElementType(); t.free(p);</td>
|
|
|
|
<td></td>
|
|
</tr>
|
|
</table>
|
|
|
|
<h2>Symbols</h2>
|
|
|
|
<ul>
|
|
<li>boost::object_pool</li>
|
|
</ul>
|
|
|
|
<h2><a href="../implementation/object_pool.html">Implementation Details</a></h2>
|
|
<hr>
|
|
|
|
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
|
|
"../../../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
|
|
height="31" width="88"></a></p>
|
|
|
|
<p>Revised
|
|
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
|
|
|
|
<p><i>Copyright © 2000, 2001 Stephen Cleary (scleary AT jerviswebb DOT com)</i></p>
|
|
|
|
<p><i>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">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
|
|
</body>
|
|
</html>
|