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

I actually find it irritating when somebody uses const references like this for the basic datatypes. I can't see any benefit of doing this, although it may be argued that for datatypes bigger than sizeof(pointer) it may be more efficient. Although, I really don't care about such minute 'optimizations'.