On Friday, 13 July 2018 at 01:18:48 UTC, Andrei Alexandrescu
wrote:
On 7/12/18 2:30 PM, ag0aep6g wrote:
You're still potentially changing the semantics of existing
code. `@implicit` can be a UDA today:
----
enum implicit = 0;
struct C
{
@implicit this(ref C another) {}
}
----
Today, that's a normal constructor. With the DIP, it becomes a
copy constructor.
That is correct and a liability of the current DIP. That should
be mentioned in it.
That's easily fixed by implementing a compiler recognized UDA.
That would mean that it would only be a copy constructor if
"implicit" is defined in core.attribute. This would also avoid
any special syntax in the parser. The already existing @selector
is implemented like this.
--
/Jacob Carlborg
