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

//
// FunctionDelegate.h
//
// $Id: //poco/1.3/Foundation/include/Poco/FunctionDelegate.h#1 $
//
// Library: Foundation
// Package: Events
// Module:  FunctionDelegate
//
// Implementation of the FunctionDelegate 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_FunctionDelegate_INCLUDED
#define  Foundation_FunctionDelegate_INCLUDED


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


namespace Poco {


template <class TArgs, bool hasSender = true, bool senderIsConst = true> 
class FunctionDelegate: public AbstractDelegate<TArgs>
        /// Wraps a C style function (or a C++ static fucntion) to be used as
        /// a delegate
{
public:
        typedef void (*NotifyMethod)(const void*, TArgs&);

        FunctionDelegate(NotifyMethod method):
                AbstractDelegate<TArgs>(*reinterpret_cast<void**>(&method)),
                _receiverMethod(method)
        {
        }

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

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

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

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

protected:
        NotifyMethod _receiverMethod;

private:
        FunctionDelegate();
};


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

        FunctionDelegate(NotifyMethod method):
                AbstractDelegate<TArgs>(*reinterpret_cast<void**>(&method)),
                _receiverMethod(method)
        {
        }

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

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

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

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

protected:
        NotifyMethod _receiverMethod;

private:
        FunctionDelegate();
};


template <class TArgs, bool senderIsConst> 
class FunctionDelegate<TArgs, false, senderIsConst>: public AbstractDelegate<TArgs>
{
public:
        typedef void (*NotifyMethod)(TArgs&);

        FunctionDelegate(NotifyMethod method):
                AbstractDelegate<TArgs>(*reinterpret_cast<void**>(&method)),
                _receiverMethod(method)
        {
        }

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

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

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

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

protected:
        NotifyMethod _receiverMethod;

private:
        FunctionDelegate();
};


} // namespace Poco


#endif // Foundation_FunctionDelegate_INCLUDED