On 01/24/2013 11:33 AM, Jonathan M Davis wrote:
> It's intended. constness matters more than refness when selecting a
function
> overload. From the docs ( http://dlang.org/function.html#<u>function</u>-
> overloading ):
>
> -----
> Functions are overloaded based on how well the arguments to a function
> can match up with the parameters. The function with the best match is se
> lected. The levels of matching are:
>
> no match
> match with implicit conversions
> match with conversion to const
> exact match
> -----
That doesn't explain why the first case selects the ref function:
void foo(A a) {
writeln("without ref");
foo(a); // <-- why is this foo(ref A)?
}
void foo(ref A a) {
writeln("with ref");
}
foo(A) is the exact match there because the type of a is A.
What is also considered in function selection is the rvalue-lvalue
distinction, which shouldn't affect the outcome here either.
Ali
