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+/***************************************************************************
+
+ delegate.c
+
+ Templates and classes to enable delegates for callbacks.
+
+****************************************************************************
+
+ Copyright Aaron Giles
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name 'MAME' nor the names of its contributors may be
+ used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR
+ IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT,
+ INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ POSSIBILITY OF SUCH DAMAGE.
+
+***************************************************************************/
+
+#include "emucore.h"
+#include "delegate.h"
+
+
+//**************************************************************************
+// INTERNAL DELEGATE HELPERS
+//**************************************************************************
+
+#if (USE_DELEGATE_TYPE == DELEGATE_TYPE_INTERNAL)
+
+//-------------------------------------------------
+// delegate_convert_raw - given an object and
+// an raw function, adjust the object base and
+// return the actual final code pointer
+//-------------------------------------------------
+
+delegate_generic_function delegate_internal_mfp::convert_to_generic(delegate_generic_class *&object) const
+{
+ // apply the "this" delta to the object first
+ object = reinterpret_cast<delegate_generic_class *>(reinterpret_cast<UINT8 *>(object) + m_this_delta);
+
+ // if the low bit of the vtable index is clear, then it is just a raw function pointer
+ if (!(m_function & 1))
+ return reinterpret_cast<delegate_generic_function>(m_function);
+
+ // otherwise, it is the byte index into the vtable where the actual function lives
+ UINT8 *vtable_base = *reinterpret_cast<UINT8 **>(object);
+ return *reinterpret_cast<delegate_generic_function *>(vtable_base + m_function - 1);
+}
+
+#endif