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/* NewNet - A networking framework in C++
Copyright (C) 2006-2007 Ingmar K. Steen (iksteen@gmail.com)
Copyright 2008 little blue poney <lbponey@users.sourceforge.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef NEWNET_GUARDOBJECT_H
#define NEWNET_GUARDOBJECT_H
#include <vector>
#include <algorithm>
namespace NewNet
{
class Object;
//! Helper class for detecting object deletion.
/*! This class is used to detect when objects are deleted. You can add
callbacks that will get invoked when the object is deleted. All
objects have a guard object embedded. See NewNet::Object. */
class GuardObject
{
public:
//! The callback class for the guard object.
/*! The callback class for the guard object. operator()(Object * p) will be
invoked when the callback is added to a guard object and the guard
object is deleted. */
class Callback
{
public:
#ifndef DOXYGEN_UNDOCUMENTED
virtual ~Callback() {}
#endif // DOXYGEN_UNDOCUMENTED
//! Override this and place your callback code here.
/*! Override this and place your callback code here. */
virtual void operator()(Object * p) = 0;
};
//! Create a new guard object.
/*! Create a new guard object. */
GuardObject()
{
}
#ifndef DOXYGEN_UNDOCUMENTED
void emit(Object * p)
{
std::vector<Callback *>::iterator it, end = m_Callbacks.end();
for(it = m_Callbacks.begin(); it != end; ++it)
(*it)->operator()(p);
}
#endif // DOXYGEN_UNDOCUMENTED
//! Add a callback to the guard object.
/*! Add a callback to the guard object so the callback will be invoked
when the guard object is deleted. Note: this stores a regular pointer
and not a RefPtr. */
GuardObject & operator+=(Callback * p)
{
m_Callbacks.push_back(p);
return *this;
}
//! Remove a callback from the guard object.
/*! Remove a callback from the guard object. It will no longer get invoked
when the guard object is deleted. Note that since the guard object
stores a regular pointer to the callback, it will not get deleted
automatically. */
GuardObject & operator-=(Callback * p)
{
std::vector<Callback *>::iterator it;
it = std::find(m_Callbacks.begin(), m_Callbacks.end(), p);
if (it != m_Callbacks.end())
m_Callbacks.erase(it);
return *this;
}
private:
std::vector<Callback *> m_Callbacks;
};
}
#endif // NEWNET_GUARDOBJECT_H
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