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/*
* Anope IRC Services
*
* Copyright (C) 2012-2016 Anope Team <team@anope.org>
*
* This file is part of Anope. Anope 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, version 2.
*
* 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, see see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "services.h"
/** The base class that most classes in Anope inherit from
*/
class CoreExport Base
{
/* References to this base class */
std::set<ReferenceBase *> *references;
public:
Base();
virtual ~Base();
/** Adds a reference to this object. Eg, when a Reference
* is created referring to this object this is called. It is used to
* cleanup references when this object is destructed.
*/
void AddReference(ReferenceBase *r);
void DelReference(ReferenceBase *r);
};
class ReferenceBase
{
static std::set<ReferenceBase *> *references;
public:
static void ResetAll();
ReferenceBase();
virtual ~ReferenceBase();
virtual void Invalidate() anope_abstract;
virtual void Reset() { }
};
/** Used to hold pointers to objects that may be deleted. A Reference will
* no longer be valid once the object it refers is destructed.
*/
template<typename T>
class Reference : public ReferenceBase
{
protected:
T *ref;
virtual void Check() { }
public:
Reference() : ref(nullptr)
{
}
Reference(T *obj) : ref(obj)
{
if (ref)
ref->AddReference(this);
}
Reference(const Reference<T> &other) : ref(other.ref)
{
if (ref)
ref->AddReference(this);
}
virtual ~Reference()
{
if (*this)
this->ref->DelReference(this);
}
void Invalidate() override
{
ref = nullptr;
}
Reference<T>& operator=(const Reference<T> &other)
{
if (this != &other)
{
if (*this)
this->ref->DelReference(this);
this->ref = other.ref;
if (*this)
this->ref->AddReference(this);
}
return *this;
}
explicit operator bool()
{
Check();
return this->ref != nullptr;
}
operator T*()
{
if (*this)
return this->ref;
return nullptr;
}
T* operator->()
{
if (*this)
return this->ref;
return nullptr;
}
T* operator*()
{
if (*this)
return this->ref;
return nullptr;
}
/** Note that we can't have an operator< that returns this->ref < other.ref
* because this function is used to sort objects in containers (such as set
* or map), and if the references themselves can change if the object they
* refer to is invalidated or changed, then this screws with the order that
* the objects would be in the container without properly adjusting the
* container, resulting in weird stuff.
*
* As such, we don't allow storing references in containers that require
* operator<, because they would not be able to compare what the references
* actually referred to.
*/
bool operator==(const Reference<T> &other)
{
if (*this)
return this->ref == other;
return false;
}
};
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