const and mutable opApply's

[Steven Schveighoffer via Digitalmars-d-learn]

On 6/19/16 6:17 PM, Oleg B wrote:
> Hello
...
> How I can rewrite this code without mixin's and with one (maybe inout)
> opApply?

Someone just asked a similar question about this: 
https://forum.dlang.org/post/nk90v2$1fr3$1@digitalmars.com

-Steve