Parameter forwarding

Kostiantyn Tokar tokarkonstantyn at
Fri Oct 15 06:52:41 UTC 2021

On Thursday, 14 October 2021 at 17:53:57 UTC, Tejas wrote:
> Maybe DIP 1040 will automatically solve that?
>>last use of objects that is a copy gets elided into a move
> That is what it states, so maybe this one time, the problem 
> will go away just by waiting?

It would be great, but still, if I understand correctly, it is 
not perfect solution for lvalue arguments. Consider, e.g., 
`Tuple` construction from an lvalue. With this DIP and current 
state of constructor it will be 1 copy (from argument to 
constructor's parameter) and 1 blit (from parameter to the 
field). With `auto ref` and forwarding it would be 1 copy from 
parameter to the field and no blits. Forwarding saves one blit 
per indirection, i.e., for `tuple` it would be 2 blits vs. 0.

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