Discussion: Rvalue refs and a Move construtor for D

Suleyman sahmi.soulaimane at gmail.com
Mon Sep 9 01:25:18 UTC 2019

On Monday, 9 September 2019 at 01:09:52 UTC, Manu wrote:
> [...]
> For instance, perfect forwarding can't deal with scope. We have 
> talked
> about `auto ref` being able to address the perfect forwarding 
> issue
> with `@rvalue ref`, but `scope` and `return` has never had any 
> kind of
> solution.

Why should there be a solution? Lvaluness is overloadable in D, 
and with rvalue ref rvaluness also becomes overloadable. scope is 
not overloadable. Ex:

void foo(return scope ref int i) {}
void foo(ref int i) {}

void main()
     int i;
     foo(&i); // error: ambiguous call

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