How to iterate using foreach on a class?

[Gary Willoughby]

On Friday, 1 November 2013 at 11:35:03 UTC, simendsjo wrote:
> On Friday, 1 November 2013 at 11:30:12 UTC, Gary Willoughby 
> wrote:
>> I have a class which contains an array as a core collection of 
>> data. I want to pass an instance of this class to a foreach 
>> loop and iterate through the enclosed array. How do i do this? 
>> I've asked this before and got an answer but i can't find 
>> anything now.
>
> alias this on the underlying array, or implement opApply: 
> http://dlang.org/statement.html

Ah that's it, opApply! ta.