Move Constructors - Converting Lvalues to Rvalues

[Manu]

On Thu, 3 Oct 2024 at 03:21, Walter Bright via Digitalmars-d <
digitalmars-d at puremagic.com> wrote:

> On 10/1/2024 1:15 PM, Timon Gehr wrote:
> > I guess the new implementation you have in mind is something like the
> following?
> >
> > ```d
> > auto move(T)(ref T arg)=>__rvalue(arg);
> > ```
>
> Not exactly. __rvalue would also convert an rvalue to an rvalue.
>

-preview=rvaluerefparams addresses this; it allows an rvalue to be supplied
to the lvalue there. It's actually an essential mechanic to this whole
thing, because it will allow the appropriate selection of copy/move
overloads where a type may define either one, or both. If a copy and/or
move constructor exists, it needs to select the proper one, and the
-preview handles that properly as is.
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