foreach and filter

[Steven Schveighoffer]

On Thu, 12 Apr 2012 13:44:36 -0400, Timon Gehr <timon.gehr at gmx.ch> wrote:

> 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.

It's implied pure if filter is pure.  Templates are auto-pure if all the  
functions they call are pure.  array should not be specifically marked  
pure.

This may be what you meant (i.e. it's not being implied as pure), but I  
want to be clear what it *should* be.

-Steve