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45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
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#ifndef SELFREFCOUNTER_H
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#define SELFREFCOUNTER_H
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#include "VFSDefines.h"
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#include "VFSAtomic.h"
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VFS_NAMESPACE_START
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// self must point to the object that holds the counter.
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template <class T, bool DELSELF = true> class SelfRefCounter
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{
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private:
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T *self;
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volatile int c;
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SelfRefCounter(SelfRefCounter& r); // forbid copy constructor
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inline unsigned int _deref(void)
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{
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volatile unsigned int cc = (unsigned int)Atomic_Decr(c); // copy c, in case we get deleted
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if(DELSELF && !cc)
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{
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delete self;
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}
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return cc;
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}
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public:
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SelfRefCounter(T *p): self(p), c(1) {}
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~SelfRefCounter() { /* DEBUG(ASSERT(c <= 1)); */ } // its ok if the last reference calls delete instead of _deref()
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inline unsigned int count(void) { return c; }
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// post-increment (dummy int)
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inline unsigned int operator++(int) { unsigned int cc = c; Atomic_Incr(c); return cc; }
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inline unsigned int operator--(int) { unsigned int cc = c; _deref(); return cc; }
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// pre-increment
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inline unsigned int operator++(void) { return (unsigned int)Atomic_Incr(c); }
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inline unsigned int operator--(void) { return _deref(); }
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};
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VFS_NAMESPACE_END
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#endif
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