if (a.among("struct", "class", "union")) { ... }
if (b.between(1, 100)) { ... }
Is between inclusive or not of the endpoints?
After quite a bit of thought, I think inclusive is the right
way.
Then there's no way to specify an empty interval. I suppose
with "between" that would not be relevant.
Perhaps b.between(1, 0) would always return false.
However I'd use different names: among=>isOneOf,
between=>isInRange. I would also define another function inRange
that ensures, rather than tests, that a value is in range:
string userInput = "-7";
int cleanInput = inRange(parse!int(userInput), 1, 100);
