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#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;
/** 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;
/** 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;
};
};
template <class T>
template <class F>
class Handler<T>::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;
};
template <class T>
template <class X, void (X::*F)(T)>
class Handler<T>::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;
};
}}
#endif /*!QPID_FRAMING_HANDLER_H*/
//
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