On Wednesday, 26 March 2014 at 15:37:38 UTC, Steven Schveighoffer
wrote:
Yes, but when you know that empty is going to return false,
there isn't any logical reason to call it. It is an awkward
requirement.
-Steve
Not only that, but it's also a performance criteria: If you are
iterating on two ranges at once (think "copy"), then you *know*
"range2" is longer than "range1", even if you don't know its
length.
Why pay for "range2.empty", when you know it'll always be false?
There is a noticeable performance difference if you *don't* check.
