86 lines
1.3 KiB
C++
86 lines
1.3 KiB
C++
#ifndef _AUTOLISTCLASS_H_
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#define _AUTOLISTCLASS_H_
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class AutoListClass;
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extern AutoListClass *pALCHead;
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extern AutoListClass *pALCTail;
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extern int AutoListClassCount;
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class AutoListClass
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{
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protected:
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AutoListClass *pALCPrev;
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AutoListClass *pALCNext;
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public:
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AutoListClass(void)
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{
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if (pALCHead == NULL)
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{
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pALCHead = this;
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pALCTail = this;
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pALCPrev = NULL;
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pALCNext = NULL;
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}
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else // not empty
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{
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AutoListClass *curr;
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curr = pALCTail;
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curr->pALCNext = this;
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pALCPrev = curr;
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pALCTail = this;
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pALCNext = NULL;
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}
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AutoListClassCount++;
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}
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~AutoListClass()
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{
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if (pALCHead == this)
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pALCHead = pALCNext;
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if (pALCTail == this)
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pALCTail = pALCPrev;
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if (pALCNext != NULL)
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pALCNext->pALCPrev = pALCPrev;
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if (pALCPrev != NULL)
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pALCPrev->pALCNext = pALCNext;
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// just in case clean up
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pALCNext = NULL;
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pALCPrev = NULL;
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AutoListClassCount--;
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}
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AutoListClass * GetNext (void)
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{
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return pALCNext;
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}
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AutoListClass * GetPrev (void)
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{
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return pALCPrev;
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}
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static AutoListClass * GetHead (void)
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{
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return pALCHead;
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}
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static AutoListClass * GetTail (void)
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{
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return pALCTail;
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}
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static int ALCCount (void)
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{
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return AutoListClassCount;
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}
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};
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#endif
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