DIP 1016--ref T accepts r-values--Community Review Round 1
Seb
seb at wilzba.ch
Fri Jul 20 10:31:48 UTC 2018
On Friday, 20 July 2018 at 10:08:03 UTC, Dgame wrote:
> On Friday, 20 July 2018 at 09:39:47 UTC, Nicholas Wilson wrote:
>> On Friday, 20 July 2018 at 09:03:18 UTC, Dukc wrote:
>>> appending something (like .byRef or byRef!long, the latter
>>> making an implicit type conversion)
>>
>> That can't work: either it returns an expired stack temporary
>> (*very* bad), or allocates with no way to deallocate (bad).
>
> What about something like this?
>
> ----
> import std.stdio;
>
> ref T byRef(T)(T value) {
> static T _val = void;
> _val = value;
>
> return _val;
> }
>
> void foo(ref int a) {
> writeln("A = ", a);
> }
>
> void main() {
> foo(42.byRef);
> foo(23.byRef);
> }
> ----
That can't work, consider e.g.:
foo(10.byRef, 20.byRef); // calls foo with (20, 20)
https://run.dlang.io/is/lazeu2
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