Like this?
let sets: [MyOptionSet] = [MyOptionSet(strings: ["one"]), MyOptionSet(strings:
["two"]), MyOptionSet(strings: ["one", "two"])]
let unioned = sets.reduce(MyOptionSet(rawValue: 0)) {
(result, set) in return result.union(set)
}
unioned.rawValue
> On Nov 3, 2016, at 7:44 PM, Jon Shier <[email protected]> wrote:
>
> Thanks Erica. I’ve been able to transform arrays of strings into arrays of my
> OptionSets using an enum approach like you describe. I was looking more for a
> generic approach that I could apply to all of the various OptionSets I have
> to decode from JSON. I suppose whether it’s from an array of strings or array
> of the OptionSet is less important, but getting to the array of the OptionSet
> itself is something I can already do.
>
>
> Thanks,
>
> Jon
>
>> On Nov 3, 2016, at 9:37 PM, Erica Sadun <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Maybe something like this? Or you could just bitwise || individual sets. Or
>> you could use a dictionary to lookup [string: rawValue]. etc.
>>
>> public struct MyOptionSet: OptionSet {
>> public static let one = MyOptionSet(rawValue: 1 << 0)
>> public static let two = MyOptionSet(rawValue: 1 << 1)
>> public static let three = MyOptionSet(rawValue: 1 << 2)
>>
>> public var rawValue: Int { return _rawValue }
>> public init(rawValue: Int) { self._rawValue = rawValue }
>> private let _rawValue: Int
>>
>> private enum StringEnum: String { case one, two, three }
>> public init(strings: [String]) {
>> var set = MyOptionSet()
>> strings.flatMap({ StringEnum(rawValue: $0) })
>> .flatMap({ MyOptionSet(rawValue: 1 << $0.hashValue) })
>> .forEach { set.insert($0) }
>> _rawValue = set.rawValue
>> }
>> }
>>
>> let stringArray: [String] = ["one", "three"]
>> let stringOptions = MyOptionSet(strings: stringArray)
>> stringOptions.rawValue
>>
>>> On Nov 3, 2016, at 7:09 PM, Jon Shier via swift-users
>>> <[email protected] <mailto:[email protected]>> wrote:
>>>
>>> Swifters:
>>> I’m dealing with a JSON API where sets of options are returned as
>>> arrays of strings. Representing these as OptionSets seems ideal. I can
>>> decode the arrays of strings into an array of individual OptionSet values,
>>> but I’ve run into a dead end when trying generically reduce the array of
>>> OptionSets to a single OptionSet value. I’ve tried variety of ways of
>>> definition a Collection extension, even tried defining a global function,
>>> but I can’t seem to use the OptionSet sequence initializer or reduce itself
>>> (cannot invoke insert with argument of type (OptionSet) (or T)). Any
>>> guidance here?
>>> Here’s what I’ve tried:
>>>
>>> extension Collection where Iterator.Element == OptionSet {
>>>
>>> func reduced() -> Iterator.Element {
>>> return reduce(Iterator.Element()) {
>>> var newResult = $0
>>> newResult.insert($1)
>>> return newResult
>>> }
>>> }
>>>
>>> }
>>>
>>> extension Collection where Iterator.Element == OptionSet {
>>>
>>> func reduced<T: OptionSet>() -> T {
>>> return reduce(T()) {
>>> var newResult = $0
>>> newResult.insert($1)
>>> return newResult
>>> }
>>> }
>>>
>>> }
>>>
>>>
>>> extension Collection where Iterator.Element == OptionSet {
>>> func reduced() -> Iterator.Element {
>>> return Iterator.Element(self)
>>> }
>>> }
>>>
>>> func reduced<T: OptionSet>(_ options: [T]) -> T {
>>> return options.reduce(T()) {
>>> var newResult = $0
>>> newResult.insert($1)
>>>
>>> return newResult
>>> }
>>> }
>>>
>>> Jon Shier
>>> _______________________________________________
>>> swift-users mailing list
>>> [email protected] <mailto:[email protected]>
>>> https://lists.swift.org/mailman/listinfo/swift-users
>>> <https://lists.swift.org/mailman/listinfo/swift-users>
>>
>
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