9381d29b6f
urces git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3963 a95241bf-73f2-0310-859d-f6bbb57e9c96
56 lines
2.3 KiB
C++
56 lines
2.3 KiB
C++
//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// File Name: SharedObject.h
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// Author: DarkWyrm <bpmagic@columbus.rr.com>
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// Description: This class is used as a base class for other objects which
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// must be shared. By using this, objects which depend on its
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// existence can be somewhat sure that the shared object will
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// not be deleted until nothing depends on it.
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//
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//------------------------------------------------------------------------------
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#ifndef SHAREDOBJ_H_
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#define SHAREDOBJ_H_
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#include <SupportDefs.h>
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/*!
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\class SharedObject SharedObject.h
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\brief Base class for shared objects
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SharedObjects track dependencies upon a particular object. In this way, is is
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possible to ensure that a shared resource is not deleted if something else
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needs it. How the dependency tracking is done largely depends on the child class.
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*/
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class SharedObject
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{
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public:
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SharedObject(void) { dependents=0; }
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virtual ~SharedObject(void){}
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virtual void AddDependent(void) { dependents++; }
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virtual void RemoveDependent(void) { dependents--; }
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virtual bool HasDependents(void) { return (dependents>0)?true:false; }
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private:
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uint32 dependents;
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};
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#endif
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