On 2020-06-08 22:11, John Spicer via Core wrote:
I don’t recall if a feature test macro was discussed for this.
At the time, I think I would have thought one was not needed, but that
could be wrong.
There is a workaround of sorts. If you add any function template with
the same name and that will be found by normal lookup, then ADL will
be done for the function template call with the explicit argument
list.
namespace N {
struct A { };
template <typename T>
T func(const A&) { return T(); }
}
template <class T, int x[-sizeof(T)]> void func(); // something
uncallable
void f() {
N::A a;
func<int>(a);
}
Which is not to say that we shouldn’t add a macro for this.
Would I totally be going overboard if I suggested that merged papers
either a) change a feature macro (incl. adding one) or b) document
workarounds that users would have to take instead? A simple "none
needed" shouldn't be enough, IMHO.
Thanks,
Marc
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