foreach and filter

[Jonathan M Davis]

On Thursday, April 12, 2012 19:44:36 Timon Gehr 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.

Probably a result of various array-related stuff which should be pure but isn't 
(e.g. Appender and some of what's in object_.d), but I'd have to go dig 
through the implementation to see. We have some pull requests though that 
should improve that situation for 2.060, and a number of them _must_ be sorted 
out for 2.060, because we're looking at making toString pure, and too many 
string-related functions (particularly format, text, and to) can't be pure yet 
for that to work.

- Jonathan M Davis