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    <title>clGetExtensionFunctionAddress</title>
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        <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>
      </div>
      <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>
        </div>
      </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.x-latest.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. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials. 
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