Hi, help please, how I get array of elements the base type from Variant?


http://dpaste.dzfl.pl/6dd70f9b

On Thursday, 21 November 2013 at 05:16:10 UTC, RomulT wrote:
> Hi, help please, how I get array of elements the base type from Variant?
>
>
> http://dpaste.dzfl.pl/6dd70f9b

may be there is a way to cast array directly but i doubt.

so you need either to do this

	IXXX[] x = [new XXX(), new XXX()];
	Variant v = x;
	writeln(v.get!(IXXX[]));

or cast all members of original array to its base type

	XXX[] x = [new XXX(), new XXX()];
	Variant v = x;

	foreach( ixx ; v.get!(XXX[]) )
	  writeln(cast(IXXX)ixx.get());

On Thursday, 21 November 2013 at 05:44:53 UTC, evilrat wrote:
> On Thursday, 21 November 2013 at 05:16:10 UTC, RomulT wrote:
>> Hi, help please, how I get array of elements the base type from Variant?
>>
>>
>> http://dpaste.dzfl.pl/6dd70f9b
>
> may be there is a way to cast array directly but i doubt.
>
> so you need either to do this
>
> 	IXXX[] x = [new XXX(), new XXX()];
> 	Variant v = x;
> 	writeln(v.get!(IXXX[]));
>
> or cast all members of original array to its base type
>
> 	XXX[] x = [new XXX(), new XXX()];
> 	Variant v = x;
>
> 	foreach( ixx ; v.get!(XXX[]) )
> 	  writeln(cast(IXXX)ixx.get());
Yes, it a work, thank you. The problem occurs when, in Variant already recorded XXX[] and it is necessary to extract the IXXX[], because in the place used nothing is known about type XXX.

On Thursday, 21 November 2013 at 06:31:54 UTC, RomulT wrote:
> Yes, it a work, thank you. The problem occurs when, in Variant already recorded XXX[] and it is necessary to extract the IXXX[], because in the place used nothing is known about type XXX.

so you need just to cast XXX[] to IXXX[] ? AFAIK arrays can't be casted to other types. but you can use std.conv.to to convert it.

writeln( std.conv.to!(IXXX[])(v.get!(XXX[])) );

but if you put another class derived from IXXX you can see they are still initial types, not IXXX as you may expect.

On Thursday, 21 November 2013 at 07:00:43 UTC, evilrat wrote:
> On Thursday, 21 November 2013 at 06:31:54 UTC, RomulT wrote:
>> Yes, it a work, thank you. The problem occurs when, in Variant already recorded XXX[] and it is necessary to extract the IXXX[], because in the place used nothing is known about type XXX.
>
> so you need just to cast XXX[] to IXXX[] ? AFAIK arrays can't be casted to other types. but you can use std.conv.to to convert it.
>
> writeln( std.conv.to!(IXXX[])(v.get!(XXX[])) );
>
> but if you put another class derived from IXXX you can see they are still initial types, not IXXX as you may expect.

I rather had in view that's - http://dpaste.dzfl.pl/43290b8c, probably Variant has the limited realization.