What is restricted pointers in C?

Question

I recently came to know about Restricted pointers in C. Can anyone throw some light on how and when is it used?

Answer 1

restrict is a keyword that can be used in pointer declarations. The restrict keyword is a declaration of intent given by the programmer to the compiler. It says that for the lifetime of the pointer, only it or a value directly derived from it will be used to access the object to which it points.

Comments

Please share any example to help in better understanding.

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Let me describe in simple words - The restrict type qualifier is an indication to the compiler that, if the memory addressed by the restrict-qualified pointer is modified, no other pointer will access that same memory.

A nice article just check this
http://docs.cray.com/books/004-2192-002/html-004-2192-002/rvusi2c1glen.html