In C++, is it bad to pass a const bool by reference?

Question

In a practical environment, using gcc or MS Visual Studio, is it bad to pass the value types which are the same size or less than an int by const reference ?

i.e. is it

Answer 1

I think it's better to pass builtin types by value rather then const reference since it's virtually faster. In case of passing by reference you need to create a reference (i.e. take an address) and then dereference when using the variable. In most cases it will be optimized by compiler in any case though