opApply outside of struct/class scope

[Jonathan M Davis via Digitalmars-d-learn]

On Sunday, 10 August 2014 at 18:45:00 UTC, Freddy wrote:
> Is there any why i can put a opApply outside of a struct scope

No overloaded operators in D can be put outside of a struct or 
class. They have to be member functions.

- Jonathan M Davis