Create curried initializer function

gistfile1.swift

func curry<A, B, C, Result>(f: (A, B, C) -> Result) -> A -> B -> C -> Result {
    return { a in { b in { c in f(a, b, c) } } }
}

struct Hoge {
    let a: String
    let b: Int
    let c: Bool?
}

extension Hoge: Argo.Decodable {
    static func decode(j: JSON) -> Decoded<Hoge> {
        let create = { Hoge($0) } // create: ((a: String, b: Int, c: Bool?)) -> Hoge
        let curried = curry(create) // curried: String -> Int -> Bool? -> Hoge
        return curried
            <^> j <| "a"
            <*> j <| "b"
            <*> j <|? "c"
    }
}