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+//---------------------------------------------------------------------------//
+// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
+//
+// Distributed under the Boost Software License, Version 1.0
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+// See http://boostorg.github.com/compute for more information.
+//---------------------------------------------------------------------------//
+
+#ifndef BOOST_COMPUTE_EXCEPTION_UNSUPPORTED_EXTENSION_ERROR_HPP
+#define BOOST_COMPUTE_EXCEPTION_UNSUPPORTED_EXTENSION_ERROR_HPP
+
+#include <exception>
+#include <sstream>
+#include <string>
+
+namespace boost {
+namespace compute {
+
+/// \class unsupported_extension_error
+/// \brief Exception thrown when attempting to use an unsupported
+///        OpenCL extension.
+///
+/// This exception is thrown when the user attempts to use an OpenCL
+/// extension which is not supported on the platform and/or device.
+///
+/// An example of this is attempting to use CL-GL sharing on a non-GPU
+/// device.
+///
+/// \see opencl_error
+class unsupported_extension_error : public std::exception
+{
+public:
+    /// Creates a new unsupported extension error exception object indicating
+    /// that \p extension is not supported by the OpenCL platform or device.
+    explicit unsupported_extension_error(const char *extension) throw()
+        : m_extension(extension)
+    {
+        std::stringstream msg;
+        msg << "OpenCL extension " << extension << " not supported";
+        m_error_string = msg.str();
+    }
+
+    /// Destroys the unsupported extension error object.
+    ~unsupported_extension_error() throw()
+    {
+    }
+
+    /// Returns the name of the unsupported extension.
+    std::string extension_name() const throw()
+    {
+        return m_extension;
+    }
+
+    /// Returns a string containing a human-readable error message containing
+    /// the name of the unsupported exception.
+    const char* what() const throw()
+    {
+        return m_error_string.c_str();
+    }
+
+private:
+    std::string m_extension;
+    std::string m_error_string;
+};
+
+} // end compute namespace
+} // end boost namespace
+
+#endif // BOOST_COMPUTE_EXCEPTION_UNSUPPORTED_EXTENSION_ERROR_HPP