foreach and filter

[Timon Gehr]

On 04/11/2012 06:08 PM, Russel Winder wrote:
> Doing something along the lines of:
>
> 	const a = array ( filter! ... ) ;
> 	foreach ( i ; a ) { ... }
>
> works fine.  Question 1 though is why I can't use immutable here, why I
> have to use const.

'array' is not pure for some reason. This should be fixed.

>  Question 2 is why I can't do:
>
> 	const a = filter! ... ;
> 	foreach ( i ; a ) { ... }
>

popFront cannot be const. (And Phobos is not very const correct 
anyways). You can try

auto a = filter!foo(cast(const)data);
foreach( i ; a ) { ... }

(Assuming data is a built-in array slice)