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A storage class specifier that hints to the compiler that a variable will be heavily used. The word “register” is related to the fact that a compiler might choose to store such a variable in a CPU register so that it can be accessed in fewer clock cycles. It was deprecated starting in C++11.

register int i = 0;
while (i < 100) {
    int g = i*i;
    i += h(i, g);

Both local variables and function parameters may be declared register. Unlike C, C++ does not place any restrictions on what can be done with a register variable. For example, it is valid to take the address of a register variable, but this may prevent the compiler from actually storing such a variable in a register.

The keyword register is unused and reserved. A program that uses the keyword register is ill-formed.

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