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What does the restrict keyword mean in C++?
There's no such keyword in C++. List of C++ keywords can be found in section 2.11/1 of C++ language standard. restrict is a keyword in the C99 version of C language and not in C++.
In C, A restrict-qualified pointer (or reference) is basically a promise to the compiler that for the scope of the pointer, the target of the pointer will only be accessed through that pointer (and pointers copied from it).
C++ compilers also support this definition for optimization purposes, but it is not a part of the official language specification.
Updated on: 30-Jul-2019
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