topical media & game development
lib-of-vs-libs-Poco-include-Poco-DefaultStrategy.h / h
//
// DefaultStrategy.h
//
//
//
// Library: Foundation
// Package: Events
// Module: DefaultStrategy
//
// Implementation of the DefaultStrategy 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_DefaultStrategy_INCLUDED
define Foundation_DefaultStrategy_INCLUDED
include "Poco/NotificationStrategy.h"
include <memory>
include <set>
include <vector>
namespace Poco {
template <class TArgs, class TDelegate, class TCompare>
class DefaultStrategy: public NotificationStrategy<TArgs, TDelegate>
Default notification strategy. Allows one observer
to register exactly once. The observer must provide an
< (less-than) operator.
{
public:
typedef std::set<TDelegate*, TCompare> Delegates;
typedef typename Delegates::iterator Iterator;
typedef typename Delegates::const_iterator ConstIterator;
public:
DefaultStrategy()
{
}
DefaultStrategy(const DefaultStrategy& s)
{
operator = (s);
}
~DefaultStrategy()
{
clear();
}
void notify(const void* sender, TArgs& arguments)
{
std::vector<Iterator> delMe;
for (Iterator it = _observers.begin(); it != _observers.end(); it++)
{
if (!(*it)->notify(sender, arguments))
{
// schedule for deletion
delMe.push_back(it);
}
}
while (!delMe.empty())
{
typename std::vector<Iterator>::iterator vit = delMe.end();
--vit;
delete **vit;
_observers.erase(*vit);
delMe.pop_back();
}
}
void add(const TDelegate& delegate)
{
Iterator it = _observers.find(const_cast<TDelegate*>(&delegate));
if (it != _observers.end())
{
delete *it;
_observers.erase(it);
}
std::auto_ptr<TDelegate> pDelegate(delegate.clone());
bool tmp = _observers.insert(pDelegate.get()).second;
poco_assert (tmp);
pDelegate.release();
}
void remove(const TDelegate& delegate)
{
Iterator it = _observers.find(const_cast<TDelegate*>(&delegate));
if (it != _observers.end())
{
delete *it;
_observers.erase(it);
}
}
DefaultStrategy& operator = (const DefaultStrategy& s)
{
if (this != &s)
{
for (ConstIterator it = s._observers.begin(); it != s._observers.end(); ++it)
{
add(**it);
}
}
return *this;
}
void clear()
{
for (Iterator it = _observers.begin(); it != _observers.end(); ++it)
{
delete *it;
}
_observers.clear();
}
bool empty() const
{
return _observers.empty();
}
protected:
Delegates _observers;
};
} // namespace Poco
endif
(C) Æliens
04/09/2009
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