On Wednesday, 24 July 2019 at 16:23:48 UTC, Paul Backus wrote:
On Wednesday, 24 July 2019 at 12:54:51 UTC, aliak wrote:
[...]
It should go on the constructor's parameter; i.e.,
this(auto return ref T value) { /* ... */ }
Under the hood, a constructor actually returns the constructed
value by reference, so the actual signature of the above
constructor seen by the lifetime checker is:
ref Optional!T __ctor(auto return ref T value)
You can see this for yourself with something like `pragma(msg,
typeof(Optional!T.__ctor))`.
Thanks! The under the hood stuff was good to know!
I was putting it in the right place but it seems to still have
been complaining. Ah well. I guess an auto ref on a constructor
doesn't really make sense anyway.
