Dangling pointers and wild pointers in computer programming are pointers that do not point to a valid object of the appropriate type, or to a distinguished null pointer value in languages which support this. Dangling pointers arise when an object is deleted or deallocated, without modifying the value of the pointer, so that the pointer still points to the memory location of the deallocated memory. As the system may reallocate the previously freed memory to another process, if the original program then dereferences the (now) dangling pointer, unpredictable behavior may result, as the memory may now contain completely different data. This is especially the case if the program writes data to memory pointed by a dangling pointer, as silent corruption of unrelated data may result, leading to subtle bugs that can be extremely difficult to find, or cause segmentation faults (*NIX) or general protection faults (Windows). If the overwritten data is bookkeeping data used by the system's memory allocator, the corruption can cause system instabilities. Wild pointers arise when a pointer is used prior to initialization to some known state, which is possible in some programming languages. They show the same eratic behaviour as dangling pointers, though they are less likely to stay undetected.
RE: what is dangling pointer?where it is used ? what a...
Dangling pointers and wild pointers in computer programming are pointers that do not point to a valid object of the appropriate type, or to a distinguished null pointer value in languages which support this. Dangling pointers arise when an object is deleted or deallocated, without modifying the value of the pointer, so that the pointer still points to the memory location of the deallocated memory. As the system may reallocate the previously freed memory to another process, if the original program then dereferences the (now) dangling pointer, unpredictable behavior may result, as the memory may now contain completely different data. This is especially the case if the program writes data to memory pointed by a dangling pointer, as silent corruption of unrelated data may result, leading to subtle bugs that can be extremely difficult to find, or cause segmentation faults (*NIX) or general protection faults (Windows). If the overwritten data is bookkeeping data used by the system's memory allocator, the corruption can cause system instabilities. Wild pointers arise when a pointer is used prior to initialization to some known state, which is possible in some programming languages. They show the same eratic behaviour as dangling pointers, though they are less likely to stay undetected.
Latest Answer : C++ is an Object Oriented Programming Language is as we know , perfectly backword compatible with C. Becase of this backword compatibility .. it has got many flaws in it that prevented it to become a really good OOP language. Java was developped by ...
Latest Answer : Dangling pointers and wild pointers in computer programming are pointers that do not point to a valid object of the appropriate type, or to a distinguished null pointer value in languages which support this. Dangling pointers arise when an object is deleted ...
Latest Answer : arulkumar: No, Void pointer is a pointer it is automatically type casted, we can assign to any pointer. But NULL pointer is a pointer which holds 0 (zero) as its content. (i.e) It doesn't pointing anything. ...
Latest Answer : The advantage of object-oriented modeling is the fact that objects encapsulate state expressed by attributes and behavior specified methods or operation and they are able to communicate by sending and retrieving messages. Using the advantages of object-oriented ...
Explain about void pointer and it's real time usage in Business
Latest Answer : Pointer to void, or a void pointer, is a special type of pointer that has a great facility of pointing to any data type.Example:int i; float f; int* exf; float* test; then exf=&i;//Corerct-exf ...
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How to turn someone else’s mistake to your advantage
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