restrict

This article is about the C programming language keyword. For other uses, see Restriction (disambiguation).

In the C programming language, restrict is a type qualifier that can be applied to a pointer to hint to the compiler that for the lifetime of that pointer, no other pointer will be used to access the same pointed-to object. This limits the effects of pointer aliasing, which can allow the compiler to make optimizations (such as vectorization) that would not otherwise be possible. Undefined behaviour results if the declaration of intent is not followed and the object is accessed by an independent pointer.

The restrict keyword was introduced by the C99 standard. Despite C++ supporting most features of C, restrict is not included in standard C++.

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