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Function Pointer Tutorials Archived 2018-06-30 at the Wayback Machine, a guide to C/C++ function pointers, callbacks, and function objects (functors) Member Function Pointers and the Fastest Possible C++ Delegates, CodeProject article by Don Clugston; Pointer Tutorials Archived 2009-04-05 at the Wayback Machine, C++ documentation and tutorials
A pointer a pointing to the memory address associated with a variable b, i.e., a contains the memory address 1008 of the variable b.In this diagram, the computing architecture uses the same address space and data primitive for both pointers and non-pointers; this need should not be the case.
Smart pointers typically keep track of the memory they point to, and may also be used to manage other resources, such as network connections and file handles. Smart pointers were first popularized in the programming language C++ during the first half of the 1990s as rebuttal to criticisms of C++'s lack of automatic garbage collection. [1] [2]
In the C++ programming language, auto_ptr is an obsolete smart pointer class template that was available in previous versions of the C++ standard library (declared in the <memory> header file), which provides some basic RAII features for C++ raw pointers. It has been replaced by the unique_ptr class.
The entity can be referred using the ID instead of a pointer. This is more robust, as it would allow for the entity to be destroyed without leaving dangling pointers. It helps for saving state externally. When the state is loaded again, there is no need for pointers to be reconstructed. Data can be shuffled around in memory as needed.
The C programming language manages memory statically, automatically, or dynamically.Static-duration variables are allocated in main memory, usually along with the executable code of the program, and persist for the lifetime of the program; automatic-duration variables are allocated on the stack and come and go as functions are called and return.
When a winter storm is on the way, everyone rushes to the grocery store.If you don't join them quickly, the shelves could be bare by the time those first flurries fall.
The difference is what is the purpose. I wrote that to demonstrate pointers. It just so happens that C is very adept at pointers, pointer arithmetic, and general uses of pointers. The point is to explain what a pointer is and one conceptualization (C) of how pointers are used. That is why it's not a tutorial on "How to use pointers in C".