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Dispose in Pascal |
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Dispose procedure
---------------------------------------------------------------- Declaration: procedure Dispose ( var P : Pointer [, Destructor] ); Example: type PString = ^String; var S : PString; ... New( S ); S^:='Goodbye World!''; Dispose (S); Purpose: Deallocates the dynamic memory allocation used by the item or object pointed to by parameter variable P. When disposing of objects (see chapter 5, "Object Oriented Programming"), an optional second parameter may specify the name of the destructor method for the object pointed to by P. When used in this form, Dispose first calls the destructor method of the object prior to deallocating the the memory pointed to by P. Important! After calling Dispose, the value of P is no longer valid. A commom programming error is to continue using a pointer after it has been deallocated. Because the pointer may still point to the original location in memory where the object had been allocated and since that memory may not be immediately claimed for use by another entity, this will sometimes work temporarily. However, to do so is a serious programming error and may cause the program to crash! Don't do it! When calling Dispose, P must be a valid pointer. If P does not point to the memory used by the heap system, Dispose will issue a run-time error and stop execution of the program. See FreeMem, GetMem, Mark, New, Release Add by Pancho You can edit it here |
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