topical media & game development
lib-of-vs-libs-Poco-include-Poco-NObserver.h / h
//
// NObserver.h
//
//
//
// Library: Foundation
// Package: Notifications
// Module: NotificationCenter
//
// Definition of the NObserver class 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_NObserver_INCLUDED
define Foundation_NObserver_INCLUDED
include "Poco/Foundation.h"
include "Poco/AbstractObserver.h"
include "Poco/AutoPtr.h"
namespace Poco {
template <class C, class N>
class NObserver: public AbstractObserver
This template class implements an adapter that sits between
a NotificationCenter and an object receiving notifications
from it. It is quite similar in concept to the
RunnableAdapter, but provides some NotificationCenter
specific additional methods.
See the NotificationCenter class for information on how
to use this template class.
This class template is quite similar to the Observer class
template. The only difference is that the NObserver
expects the callback function to accept a const AutoPtr&
instead of a plain pointer as argument, thus simplifying memory
management.
{
public:
typedef AutoPtr<N> NotificationPtr;
typedef void (C::*Callback)(const NotificationPtr&);
NObserver(C& object, Callback method):
_pObject(&object),
_method(method)
{
}
NObserver(const NObserver& observer):
AbstractObserver(observer),
_pObject(observer._pObject),
_method(observer._method)
{
}
~NObserver()
{
}
NObserver& operator = (const NObserver& observer)
{
if (&observer != this)
{
_pObject = observer._pObject;
_method = observer._method;
}
return *this;
}
void notify(Notification* pNf) const
{
N* pCastNf = dynamic_cast<N*>(pNf);
if (pCastNf)
{
NotificationPtr ptr(pCastNf, true);
(_pObject->*_method)(ptr);
}
}
bool equals(const AbstractObserver& abstractObserver) const
{
const NObserver* pObs = dynamic_cast<const NObserver*>(&abstractObserver);
return pObs && pObs->_pObject == _pObject && pObs->_method == _method;
}
bool accepts(Notification* pNf) const
{
return dynamic_cast<N*>(pNf) != 0;
}
AbstractObserver* clone() const
{
return new NObserver(*this);
}
private:
NObserver();
C* _pObject;
Callback _method;
};
} // namespace Poco
endif // Foundation_NObserver_INCLUDED
(C) Æliens
04/09/2009
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