+1, I’ve never actually wanted a negative return value from %. Array subscripting and getting an enum case from a raw integer value both expect non-negative integers, so in these cases it only makes sense to deal with positive values.
> Hello, > > I think that Swift could use the 'double modulo' operator which is for > example in CoffeeScript (some discussion can be found > herehttps://github.com/jashkenas/coffeescript/issues/1971). > > This operator, unlike normal modulo, takes sign from the divisor, not the > dividend e.g. -10 % 3 == -1, but -10 %% 3 == 2. > > In practice, this operator is useful for 'cyclical' indexing. For example, it > would be useful for calculating the real index into a collection when we are > using an index outside of the range of valid indices and could be used to > index into a collection using a negative index à la Python and Ruby (where > [1,2,3,4][-1] == 4). > > > The implementation would probably be something along these lines: > > infix operator %% { > associativity left > precedence 150 > } > > func %%<T: IntegerArithmeticType>(lhs:T, rhs:T) ->T { > return (lhs % rhs + rhs) % rhs > } > > If accepted, this could be later incorporated into a method or operator that > works directly with collections using their count property. > Maybe the syntax could be something like [1,2,3,4] %% -1 == 4. > > Ideas, suggestions?_______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution > > > _______________________________________________ swift-evolution mailing list swift-evolution@swift.org https://lists.swift.org/mailman/listinfo/swift-evolution
