register
suggest changeA 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) {
f(i);
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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