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Subscripting Prism<T, [U]> by Int produces Prism<T, U>.

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This commit is contained in:
Rob Rix 2015-09-21 15:41:01 -04:00
parent 4f97a6bc4a
commit 0eca419468
1 changed files with 23 additions and 0 deletions
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23
prototype/Doubt/JSON.swift
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@ -73,6 +73,29 @@ extension Prism where To : DictionaryType {
} }
} }
protocol ArrayType {
typealias Element
init(array: [Element])
var array: [Element] { get }
}
extension Array : ArrayType {
init(array: [Element]) {
self = array
}
var array: [Element] {
return self
}
}
extension Prism where To : ArrayType {
subscript (index: Int) -> Prism<From, To.Element> {
return self >>> Prism<To, To.Element>(forward: { $0.array[index] }, backward: { To(array: [ $0 ]) })
}
}
private func toJSON(object: AnyObject) -> JSON? { private func toJSON(object: AnyObject) -> JSON? {
struct E: ErrorType {} struct E: ErrorType {}
func die<T>() throws -> T { func die<T>() throws -> T {