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diff --git a/JavaScriptCore/API/APICast.h b/JavaScriptCore/API/APICast.h
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+++ b/JavaScriptCore/API/APICast.h
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+/*
+ * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS 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. 
+ */
+
+#ifndef APICast_h
+#define APICast_h
+
+#include "ustring.h"
+#include "ExecState.h"
+
+typedef const struct OpaqueJSContextGroup* JSContextGroupRef;
+typedef const struct OpaqueJSContext* JSContextRef;
+typedef struct OpaqueJSContext* JSGlobalContextRef;
+typedef struct OpaqueJSPropertyNameAccumulator* JSPropertyNameAccumulatorRef;
+typedef const struct OpaqueJSValue* JSValueRef;
+typedef struct OpaqueJSValue* JSObjectRef;
+
+/* Opaque typing convenience methods */
+
+inline JSC::ExecState* toJS(JSContextRef c)
+{
+    return reinterpret_cast<JSC::ExecState*>(const_cast<OpaqueJSContext*>(c));
+}
+
+inline JSC::ExecState* toJS(JSGlobalContextRef c)
+{
+    return reinterpret_cast<JSC::ExecState*>(c);
+}
+
+inline JSC::JSValue* toJS(JSValueRef v)
+{
+    return reinterpret_cast<JSC::JSValue*>(const_cast<OpaqueJSValue*>(v));
+}
+
+inline JSC::JSObject* toJS(JSObjectRef o)
+{
+    return reinterpret_cast<JSC::JSObject*>(o);
+}
+
+inline JSC::PropertyNameArray* toJS(JSPropertyNameAccumulatorRef a)
+{
+    return reinterpret_cast<JSC::PropertyNameArray*>(a);
+}
+
+inline JSC::JSGlobalData* toJS(JSContextGroupRef g)
+{
+    return reinterpret_cast<JSC::JSGlobalData*>(const_cast<OpaqueJSContextGroup*>(g));
+}
+
+inline JSValueRef toRef(JSC::JSValue* v)
+{
+    return reinterpret_cast<JSValueRef>(v);
+}
+
+inline JSValueRef* toRef(JSC::JSValue** v)
+{
+    return reinterpret_cast<JSValueRef*>(const_cast<const JSC::JSValue**>(v));
+}
+
+inline JSObjectRef toRef(JSC::JSObject* o)
+{
+    return reinterpret_cast<JSObjectRef>(o);
+}
+
+inline JSObjectRef toRef(const JSC::JSObject* o)
+{
+    return reinterpret_cast<JSObjectRef>(const_cast<JSC::JSObject*>(o));
+}
+
+inline JSContextRef toRef(JSC::ExecState* e)
+{
+    return reinterpret_cast<JSContextRef>(e);
+}
+
+inline JSGlobalContextRef toGlobalRef(JSC::ExecState* e)
+{
+    return reinterpret_cast<JSGlobalContextRef>(e);
+}
+
+inline JSPropertyNameAccumulatorRef toRef(JSC::PropertyNameArray* l)
+{
+    return reinterpret_cast<JSPropertyNameAccumulatorRef>(l);
+}
+
+inline JSContextGroupRef toRef(JSC::JSGlobalData* g)
+{
+    return reinterpret_cast<JSContextGroupRef>(g);
+}
+
+#endif // APICast_h