On Friday, 20 November 2015 at 18:23:57 UTC, HaraldZealot wrote:
All ranges in Phobos pass by value, but if I have output range with state like cumulative statistics this is useless.
Realistically, output ranges really should be passed by ref, but I'm not sure whether that's really being done in Phobos at this point - though output ranges aren't used all that much in Phobos anyway. It's mostly input ranges, which are a very different beast.
But if you just make it so that your output range is a reference type (e.g a class or a struct with a single pointer to its state), then you get around any issues caused by a function not accepting its output range by ref.
- Jonathan M Davis
