I agree with don.
IMHO, this is incredibly silly given Andrei's use case, since D can have
instead:
void foo(const Widget);
and have an optimization inside the compiler for value types to pass by
ref.
by specifying "const ref" you explicitly require that only a ref to an
l-value be provided, whereas without the "ref" an r-value is also
allowed a-la c++.
much KISSer.
"auto ref" as a syntax may be not the best choice but the way it solves
the problem is very elegant.
your "const ref":
It doesn't make it KISS.
It adds inconsistency (even though it is necessary sometimes, this one is
bad).
You lose the ability to do the opposite.
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