source: XMLIO_V2/external/src/POCO/Foundation.save/Poco/Delegate.h @ 80

//
// Delegate.h
//
// $Id: //poco/1.3/Foundation/include/Poco/Delegate.h#2 $
//
// Library: Foundation
// Package: Events
// Module:  Delegate
//
// Implementation of the Delegate template.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef  Foundation_Delegate_INCLUDED
#define  Foundation_Delegate_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/AbstractDelegate.h"
#include "Poco/FunctionDelegate.h"
#include "Poco/Expire.h"


namespace Poco {


template <class TObj, class TArgs, bool withSender=true> 
class Delegate: public AbstractDelegate<TArgs>
{
public:
        typedef void (TObj::*NotifyMethod)(const void*, TArgs&);

        Delegate(TObj* obj, NotifyMethod method):
                AbstractDelegate<TArgs>(obj),
                _receiverObject(obj), 
                _receiverMethod(method)
        {
        }

        Delegate(const Delegate& delegate):
                AbstractDelegate<TArgs>(delegate),
                _receiverObject(delegate._receiverObject),
                _receiverMethod(delegate._receiverMethod)
        {
        }

        ~Delegate()
        {
        }
        
        Delegate& operator = (const Delegate& delegate)
        {
                if (&delegate != this)
                {
                        this->_pTarget        = delegate._pTarget;
                        this->_receiverObject = delegate._receiverObject;
                        this->_receiverMethod = delegate._receiverMethod;
                }
                return *this;
        }

        bool notify(const void* sender, TArgs& arguments)
        {
                (_receiverObject->*_receiverMethod)(sender, arguments);
                return true; // a "standard" delegate never expires
        }

        AbstractDelegate<TArgs>* clone() const
        {
                return new Delegate(*this);
        }

protected:
        TObj*        _receiverObject;
        NotifyMethod _receiverMethod;

private:
        Delegate();
};


template <class TObj, class TArgs> 
class Delegate<TObj, TArgs, false>: public AbstractDelegate<TArgs>
{
public:
        typedef void (TObj::*NotifyMethod)(TArgs&);

        Delegate(TObj* obj, NotifyMethod method):
                AbstractDelegate<TArgs>(obj),
                _receiverObject(obj), 
                _receiverMethod(method)
        {
        }

        Delegate(const Delegate& delegate):
                AbstractDelegate<TArgs>(delegate),
                _receiverObject(delegate._receiverObject),
                _receiverMethod(delegate._receiverMethod)
        {
        }

        ~Delegate()
        {
        }
        
        Delegate& operator = (const Delegate& delegate)
        {
                if (&delegate != this)
                {
                        this->_pTarget        = delegate._pTarget;
                        this->_receiverObject = delegate._receiverObject;
                        this->_receiverMethod = delegate._receiverMethod;
                }
                return *this;
        }

        bool notify(const void*, TArgs& arguments)
        {
                (_receiverObject->*_receiverMethod)(arguments);
                return true; // a "standard" delegate never expires
        }

        AbstractDelegate<TArgs>* clone() const
        {
                return new Delegate(*this);
        }

protected:
        TObj*        _receiverObject;
        NotifyMethod _receiverMethod;

private:
        Delegate();
};


template <class TObj, class TArgs>
static Delegate<TObj, TArgs, true> delegate(TObj* pObj, void (TObj::*NotifyMethod)(const void*, TArgs&))
{
        return Delegate<TObj, TArgs, true>(pObj, NotifyMethod);
}


template <class TObj, class TArgs>
static Delegate<TObj, TArgs, false> delegate(TObj* pObj, void (TObj::*NotifyMethod)(TArgs&))
{
        return Delegate<TObj, TArgs, false>(pObj, NotifyMethod);
}



template <class TObj, class TArgs>
static Expire<TArgs> delegate(TObj* pObj, void (TObj::*NotifyMethod)(const void*, TArgs&), Timestamp::TimeDiff expireMillisecs)
{
        return Expire<TArgs>(Delegate<TObj, TArgs, true>(pObj, NotifyMethod), expireMillisecs);
}


template <class TObj, class TArgs>
static Expire<TArgs> delegate(TObj* pObj, void (TObj::*NotifyMethod)(TArgs&), Timestamp::TimeDiff expireMillisecs)
{
        return Expire<TArgs>(Delegate<TObj, TArgs, false>(pObj, NotifyMethod), expireMillisecs);
}


template <class TArgs>
static Expire<TArgs> delegate(void (*NotifyMethod)(const void*, TArgs&), Timestamp::TimeDiff expireMillisecs)
{
        return Expire<TArgs>(FunctionDelegate<TArgs, true, true>(NotifyMethod), expireMillisecs);
}


template <class TArgs>
static Expire<TArgs> delegate(void (*NotifyMethod)(void*, TArgs&), Timestamp::TimeDiff expireMillisecs)
{
        return Expire<TArgs>(FunctionDelegate<TArgs, true, false>(NotifyMethod), expireMillisecs);
}


template <class TArgs>
static Expire<TArgs> delegate(void (*NotifyMethod)(TArgs&), Timestamp::TimeDiff expireMillisecs)
{
        return Expire<TArgs>(FunctionDelegate<TArgs, false>( NotifyMethod), expireMillisecs);
}


template <class TArgs>
static FunctionDelegate<TArgs, true, true> delegate(void (*NotifyMethod)(const void*, TArgs&))
{
        return FunctionDelegate<TArgs, true, true>(NotifyMethod);
}


template <class TArgs>
static FunctionDelegate<TArgs, true, false> delegate(void (*NotifyMethod)(void*, TArgs&))
{
        return FunctionDelegate<TArgs, true, false>(NotifyMethod);
}


template <class TArgs>
static FunctionDelegate<TArgs, false> delegate(void (*NotifyMethod)(TArgs&))
{
        return FunctionDelegate<TArgs, false>(NotifyMethod);
}


} // namespace Poco


#endif