restrict is a C99 feature which is getting a lot of attention lately by allowing the compiler to perform "previously-fortran-only" optimizations to pointers. It's also the same keyword announced by Microsoft recently to be the underpinnings of the C++AMP specification.
One argument is that C needs
restrict more than C++, because many operations are done with pointers to primitive types and therefore C code has more aliasing problems than C++.
In C++ we also have the
valarray family of classes that are supposed to handle arrays of primitive types that are not allowed to alias. Not that it is used much...