On Friday, 13 November 2015 at 17:25:44 UTC, rsw0x wrote:
afaik that's RVO, isn't it?
D's RVO semantics are pretty much unspecified still(outside of
dmd,) I believe(don't quote me) that walter said it's supposed
to be part of the spec but I could never find anything.
Well, RVO is used when the value being returned is a local
variable. The compiler knows that it can be moved rather than
copied, so it's moved. However, the this pointer/reference isn't
a local variable. It's a member variable. So, it can't be moved.
So, RVO shouldn't kick in when returning this.
- Jonathan M Davis
