66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
#ifndef _WDL_DESTROYCHECK_H_
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#define _WDL_DESTROYCHECK_H_
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// this is a useful class for verifying that an object (usually "this") hasn't been destroyed:
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// to use it you add a WDL_DestroyState as a member of your class, then use the WDL_DestroyCheck
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// helper class (creating it when the pointer is known valid, and checking it later to see if it
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// is still valid).
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//
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// example:
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// class myClass {
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// WDL_DestroyState dest;
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// ...
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// };
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//
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// calling code (on myClass *classInstnace):
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// WDL_DestroyCheck chk(&classInstance->dest);
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// somefunction();
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// if (!chk.isOK()) printf("classInstance got deleted!\n");
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//
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// NOTE: only use this when these objects will be accessed from the same thread -- it will fail miserably
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// in a multithreaded environment
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class WDL_DestroyCheck
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{
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public:
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class WDL_DestroyStateNextRec { public: WDL_DestroyCheck *next; };
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WDL_DestroyStateNextRec n, *prev;
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WDL_DestroyCheck(WDL_DestroyStateNextRec *state)
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{
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n.next=NULL;
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if ((prev=state))
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{
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if ((n.next=prev->next)) n.next->prev = &n;
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prev->next=this;
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}
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}
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~WDL_DestroyCheck()
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{
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if (prev)
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{
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prev->next = n.next;
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if (n.next) n.next->prev = prev;
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}
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}
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bool isOK() { return !!prev; }
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};
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class WDL_DestroyState : public WDL_DestroyCheck::WDL_DestroyStateNextRec
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{
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public:
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WDL_DestroyState() { next=NULL; }
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~WDL_DestroyState()
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{
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WDL_DestroyCheck *p = next;
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while (p) { WDL_DestroyCheck *np = p->n.next; p->prev=NULL; p->n.next=NULL; p=np; }
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}
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};
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#endif
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