756b64fd83
uses. Fixes the gcc 2 acpi build.
* Renamed WeakReferenceable::{Add,Remove}Reference() to
{Acquire,Release}Reference() for consistency.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39871 a95241bf-73f2-0310-859d-f6bbb57e9c96
131 lines
1.9 KiB
C++
131 lines
1.9 KiB
C++
/*
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* Copyright 2004-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _REFERENCEABLE_H
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#define _REFERENCEABLE_H
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#include <SupportDefs.h>
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// #pragma mark - BReferenceable
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class BReferenceable {
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public:
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BReferenceable();
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virtual ~BReferenceable();
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void AcquireReference();
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bool ReleaseReference();
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// returns true after last
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int32 CountReferences() const
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{ return fReferenceCount; }
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protected:
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virtual void FirstReferenceAcquired();
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virtual void LastReferenceReleased();
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protected:
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vint32 fReferenceCount;
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};
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// #pragma mark - BReference
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template<typename Type = BReferenceable>
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class BReference {
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public:
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BReference()
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: fObject(NULL)
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{
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}
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BReference(Type* object, bool alreadyHasReference = false)
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: fObject(NULL)
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{
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SetTo(object, alreadyHasReference);
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}
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BReference(const BReference<Type>& other)
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: fObject(NULL)
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{
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SetTo(other.fObject);
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}
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~BReference()
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{
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Unset();
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}
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void SetTo(Type* object, bool alreadyHasReference = false)
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{
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if (object != NULL && !alreadyHasReference)
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object->AcquireReference();
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Unset();
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fObject = object;
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}
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void Unset()
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{
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if (fObject) {
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fObject->ReleaseReference();
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fObject = NULL;
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}
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}
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Type* Get() const
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{
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return fObject;
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}
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Type* Detach()
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{
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Type* object = fObject;
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fObject = NULL;
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return object;
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}
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Type& operator*() const
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{
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return *fObject;
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}
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Type* operator->() const
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{
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return fObject;
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}
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operator Type*() const
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{
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return fObject;
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}
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BReference& operator=(const BReference<Type>& other)
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{
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SetTo(other.fObject);
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return *this;
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}
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bool operator==(const BReference<Type>& other) const
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{
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return (fObject == other.fObject);
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}
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bool operator!=(const BReference<Type>& other) const
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{
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return (fObject != other.fObject);
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}
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private:
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Type* fObject;
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};
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#endif // _REFERENCEABLE_H
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