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<title>clGetExtensionFunctionAddress</title>
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<div class="refentry">
<a id="idm1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="clGetExtensionFunctionAddress"></a>
<h1>clGetExtensionFunctionAddress</h1>
<p>
Returns the address of the extension function named by <code xmlns="http://www.w3.org/1999/xhtml" class="varname">funcname</code>.
</p>
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<div class="refsynopsisdiv">
<h2></h2>
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<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<strong class="fsfunc">
clGetExtensionFunctionAddress
</strong>
(</code>
<td> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">funcname</var><code>)</code></td>
</td>
</tr>
</table>
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</div>
<div class="refsect1">
<a id="parameters"></a>
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="varname">
funcname
</code>
</span>
</dt>
<dd>
<p>
Name of an extension function.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
The macro <code class="function">clGetExtensionFunctionAddress</code>
returns the address of the extension function named by <code class="varname">funcname</code>. The pointer returned should be cast to a function pointer type matching the extension function's definition defined in the
appropriate extension specification and header file. A return value of NULL indicates that the
specified function does not exist for the implementation. A non-NULL return value for
<code class="function">clGetExtensionFunctionAddress</code> does not guarantee that an extension function is actually supported. The application must also make a corresponding query using
<a class="citerefentry" href="clGetPlatformInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetPlatformInfo</span></span></a>(platform, <code class="constant">CL_PLATFORM_EXTENSIONS</code>, ... ) or <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>(device,
<code class="constant">CL_DEVICE_EXTENSIONS</code>, ... ) to determine if an extension is supported by the OpenCL
implementation.
</p>
<p>
<code class="function">clGetExtensionFunctionAddress</code> may not be queried for core (non-extension) functions in OpenCL. For functions that are queryable with <code class="function">clGetExtensionFunctionAddress</code>,
implementations may choose to also export those functions statically from the object libraries
implementing those functions. However, portable applications cannot rely on this behavior.
</p>
</div>
<div class="refsect1">
<a id="notes"></a>
<h2>Notes</h2>
<p>
Since there is no way to qualify the query with a device, the function pointer returned must work for all implementations of that extension on different devices. The behavior of calling a device extension function on a device not supporting that extension is undefined.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=224" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2009 The Khronos Group Inc.
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without limitation the rights to use, copy, modify, merge, publish,
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