Is there any overhead to declaring a variable within a loop? (C++)?

Stack space for local variables is usually allocated in function scope. So no stack pointer adjustment happens inside the loop, just assigning 4 to var . Therefore these two snippets have the same overhead.

For primitive types and POD types, it makes no difference. The compiler will allocate the stack space for the variable at the beginning of the function and deallocate it when the function returns in both cases.

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