1 files changed, 101 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/framing/Handler.h b/qpid/cpp/src/qpid/framing/Handler.h
new file mode 100644
index 0000000000..fa8db36f49
--- /dev/null
+++ b/qpid/cpp/src/qpid/framing/Handler.h
@@ -0,0 +1,101 @@
+#ifndef QPID_FRAMING_HANDLER_H
+#define QPID_FRAMING_HANDLER_H
+
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include <boost/shared_ptr.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <assert.h>
+
+namespace qpid {
+namespace framing {
+
+template <class T>
+struct Handler {
+    typedef T HandledType;
+    typedef void handleFptr(T);
+    typedef void result_type;   // Compatible with std/boost functors.
+
+    Handler(Handler<T>* next_=0) : next(next_) {}
+    virtual ~Handler() {}
+    virtual void handle(T) = 0;
+    
+    /** Allow functor syntax for calling handle */ 
+    void operator()(T t)  { handle(t); }
+
+
+    /** Pointer to next handler in a linked list. */
+    Handler<T>* next;
+
+    /** Adapt any void(T) functor as a Handler.
+     * Functor<F>(f) will copy f.
+     * Functor<F&>(f) will only take a reference to x.
+     */
+    template <class F> class Functor : public Handler<T> {
+      public:
+        Functor(F f, Handler<T>* next=0) : Handler<T>(next), functor(f) {}
+        void handle(T t) { functor(t); }
+      private:
+        F functor;
+    };
+
+    /** Adapt a member function of X as a Handler.
+     * Only holds a reference to its target, not a copy.
+     */
+    template <class X, void (X::*F)(T)>
+    class MemFunRef : public Handler<T> {
+      public:
+        MemFunRef(X& x, Handler<T>* next=0) : Handler(next), target(&x) {}
+        void handle(T t) { (target->*F)(t); }
+
+        /** Allow calling with -> syntax */
+        MemFunRef* operator->() { return this; }
+
+      private:
+        X* target;
+    };
+
+    /** Interface for a handler that implements a
+     * pair of in/out handle operations.
+     * @see InOutHandler
+     */
+    class InOutHandlerInterface {
+      public:
+        virtual ~InOutHandlerInterface() {}
+        virtual void handleIn(T) = 0;
+        virtual void handleOut(T) = 0;
+    };
+        
+    /** Support for implementing an in-out handler pair as a single class.
+     * Overrides handleIn, handleOut functions in a single class.
+     */
+    struct InOutHandler : protected InOutHandlerInterface {
+        InOutHandler(Handler<T>* nextIn=0, Handler<T>* nextOut=0) : in(*this, nextIn), out(*this, nextOut) {}
+        MemFunRef<InOutHandlerInterface, &InOutHandlerInterface::handleIn> in;
+        MemFunRef<InOutHandlerInterface, &InOutHandlerInterface::handleOut> out;
+    };
+};
+
+
+
+}}
+#endif  /*!QPID_FRAMING_HANDLER_H*/
+//