What are the benefits to passing integral types by const ref

Question

The question: Is there benefit to passing an integral type by const reference as opposed to simply by value.

ie.

void foo(const int& n); // case #1
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Answer 1

It's usually not worth it. Even for inline function, the compiler won't be stupid. The only time I would say it's appropriate is if you had a template; it might not be worth the extra effort to specialize for builtins just to take a copy instead of a reference.