2007-11-04 03:34:51 +00:00
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/*
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Copyright (C) 1999-2007 id Software, Inc. and contributors.
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For a list of contributors, see the accompanying CONTRIBUTORS file.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __IREFCOUNT_H__
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#define __IREFCOUNT_H__
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/*!
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\class IRefCounted
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\brief reference counted objects
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general hints: how to use ref count properly
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we consider ref counting as an extension of new and delete operators
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the main issue is 'when to incref' 'when to decref'
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in most cases connected to function calls
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the general thinking about that:
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- if you get a pointer to a refcounted object through a call to a function, assume that this object has been 'reserved' for you
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already (i.e. allocated if you think this the new/delete way). so if you keep the object, you don't need to incref it, and if
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you don't keep it you need to decref it.
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- if you are called in a function and a refcounted object passed as parameter, then you should assume that this is an optional
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object given to you FYI, which you don't need to decref if you don't keep / need to incref if you keep
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refcount is initialized to 1 in constructor. that serves for static objects and memory allocator
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when you allocate in memory a ref counted object, it's default ref count will be 1, you should never delete it but just call DecRef on it
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define an interface and an implementation macro to make things easier
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NOTE: we may have to provide a static library to go with that
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in case we would move irecount.h out of here into libs/
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\todo functionality needed:
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mostly enable/disable some features with compile time flags (independently from each other as much as possible)
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- log the destructor calls with != 0 ref count
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- log all incref/decref (with module info, and maybe even file/line number etc.?)
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*/
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class IRefCounted
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{
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int refCount;
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public:
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IRefCounted() { refCount = 1; }
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virtual ~IRefCounted() { }
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void IncRef() { refCount++; }
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void DecRef() { refCount--; if (refCount <= 0) delete this; }
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};
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#endif // __ISYNAPSE_H__
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