On 07/12/2018 11:25 AM, Luís Marques wrote:
On Thursday, 12 July 2018 at 15:14:19 UTC, Luís Marques wrote:
More details. The DIP says:
"The structName type needs to be identical to typeof(this); an error
is issued otherwise. This requirement may be relaxed in the future in
order to accomodate copying from objects of a different type"
(BTW, typo in "accomodate")
That would mean that if such a relaxation were introduced, then
suddenly *all* copy ctors would imply implicit conversion between the
respective types. Given D's stance on implicit conversions, I suspect
that's not going to pass mustard. So I would prefer the any "implicit"
keyword-like annotation to be reserved for explicitly approved
implicit conversions.
BTW: Multiple alias this is still planned for inclusion in D, right? If
so, what would be the (pratical?) difference between having copy ctors
with such a relaxed type requirement and just defining an equivalent
alias this method? In case the answer is that there's no significant
difference, why not drop multiple alias this, then?
Again: not the charter of this DIP, so you should ask yourself, not us,
this question.
