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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>V8: v8::ArrayBuffer::Allocator Class Reference</title>
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 <span id="projectnumber">v5.6</span>
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<li class="navelem"><a class="el" href="namespacev8.html">v8</a></li><li class="navelem"><a class="el" href="classv8_1_1ArrayBuffer.html">ArrayBuffer</a></li><li class="navelem"><a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html">Allocator</a></li> </ul>
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<div class="header">
<div class="summary">
<a href="#pub-methods">Public Member Functions</a> |
<a href="#pub-static-methods">Static Public Member Functions</a> |
<a href="classv8_1_1ArrayBuffer_1_1Allocator-members.html">List of all members</a> </div>
<div class="headertitle">
<div class="title">v8::ArrayBuffer::Allocator Class Reference<span class="mlabels"><span class="mlabel">abstract</span></span></div> </div>
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<div class="contents">
<p><code>#include <<a class="el" href="v8_8h_source.html">v8.h</a>></code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:aeeb119b0b88634faeeb7aa0c1a6d3318"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html#aeeb119b0b88634faeeb7aa0c1a6d3318">~Allocator</a> ()</td></tr>
<tr class="separator:aeeb119b0b88634faeeb7aa0c1a6d3318"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a106b0d80120ed04fe9b9675e96f0340b"><td class="memItemLeft" align="right" valign="top">virtual void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html#a106b0d80120ed04fe9b9675e96f0340b">Allocate</a> (size_t length)=0</td></tr>
<tr class="separator:a106b0d80120ed04fe9b9675e96f0340b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a92b2d5c0a826d3c435e12f3ee178f37a"><td class="memItemLeft" align="right" valign="top">virtual void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html#a92b2d5c0a826d3c435e12f3ee178f37a">AllocateUninitialized</a> (size_t length)=0</td></tr>
<tr class="separator:a92b2d5c0a826d3c435e12f3ee178f37a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a419f59d2a103a5a8863809d7977c9cd8"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html#a419f59d2a103a5a8863809d7977c9cd8">Free</a> (void *data, size_t length)=0</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:ab274d606bbc87a2a41f114d55d6da331"><td class="memItemLeft" align="right" valign="top">static <a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html">Allocator</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html#ab274d606bbc87a2a41f114d55d6da331">NewDefaultAllocator</a> ()</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A thread-safe allocator that <a class="el" href="classv8_1_1V8.html">V8</a> uses to allocate |ArrayBuffer|'s memory. The allocator is a global <a class="el" href="classv8_1_1V8.html">V8</a> setting. It has to be set via <a class="el" href="structv8_1_1Isolate_1_1CreateParams.html">Isolate::CreateParams</a>.</p>
<p>Memory allocated through this allocator by <a class="el" href="classv8_1_1V8.html">V8</a> is accounted for as external memory by <a class="el" href="classv8_1_1V8.html">V8</a>. Note that <a class="el" href="classv8_1_1V8.html">V8</a> keeps track of the memory for all internalized |ArrayBuffer|s. Responsibility for tracking external memory (using <a class="el" href="classv8_1_1Isolate.html#aaeda5fa60961a3d9d476c46200e30711">Isolate::AdjustAmountOfExternalAllocatedMemory</a>) is handed over to the embedder upon externalization and taken over upon internalization (creating an internalized buffer from an existing buffer).</p>
<p>Note that it is unsafe to call back into <a class="el" href="classv8_1_1V8.html">V8</a> from any of the allocator functions. </p>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
<a id="aeeb119b0b88634faeeb7aa0c1a6d3318"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aeeb119b0b88634faeeb7aa0c1a6d3318">◆ </a></span>~Allocator()</h2>
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<td class="memname">virtual v8::ArrayBuffer::Allocator::~Allocator </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span></span> </td>
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<h2 class="groupheader">Member Function Documentation</h2>
<a id="a106b0d80120ed04fe9b9675e96f0340b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a106b0d80120ed04fe9b9675e96f0340b">◆ </a></span>Allocate()</h2>
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<td class="memname">virtual void* v8::ArrayBuffer::Allocator::Allocate </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>length</em></td><td>)</td>
<td></td>
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<span class="mlabels"><span class="mlabel">pure virtual</span></span> </td>
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<p>Allocate |length| bytes. Return NULL if allocation is not successful. Memory should be initialized to zeroes. </p>
</div>
</div>
<a id="a92b2d5c0a826d3c435e12f3ee178f37a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a92b2d5c0a826d3c435e12f3ee178f37a">◆ </a></span>AllocateUninitialized()</h2>
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<td class="memname">virtual void* v8::ArrayBuffer::Allocator::AllocateUninitialized </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>length</em></td><td>)</td>
<td></td>
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<span class="mlabels"><span class="mlabel">pure virtual</span></span> </td>
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<p>Allocate |length| bytes. Return NULL if allocation is not successful. Memory does not have to be initialized. </p>
</div>
</div>
<a id="a419f59d2a103a5a8863809d7977c9cd8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a419f59d2a103a5a8863809d7977c9cd8">◆ </a></span>Free()</h2>
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<td class="memname">virtual void v8::ArrayBuffer::Allocator::Free </td>
<td>(</td>
<td class="paramtype">void * </td>
<td class="paramname"><em>data</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>length</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<span class="mlabels"><span class="mlabel">pure virtual</span></span> </td>
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<p>Free the memory block of size |length|, pointed to by |data|. That memory is guaranteed to be previously allocated by |Allocate|. </p>
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<a id="ab274d606bbc87a2a41f114d55d6da331"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab274d606bbc87a2a41f114d55d6da331">◆ </a></span>NewDefaultAllocator()</h2>
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<td class="memname">static <a class="el" href="classv8_1_1ArrayBuffer_1_1Allocator.html">Allocator</a>* v8::ArrayBuffer::Allocator::NewDefaultAllocator </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td></td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>malloc/free based convenience allocator.</p>
<p>Caller takes ownership. </p>
<dl class="section examples"><dt>Examples</dt><dd><a class="el" href="process_8cc-example.html#a46">process.cc</a>, and <a class="el" href="shell_8cc-example.html#a16">shell.cc</a>.</dd>
</dl>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/<a class="el" href="v8_8h_source.html">v8.h</a></li>
</ul>
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