| // | |
| // Database.swift | |
| // Model | |
| // | |
| // Created by mono on 2017/10/14. | |
| // Copyright © 2017 Masayuki Ono All rights reserved. | |
| // | |
| import Foundation | |
| import FirebaseCore |
| // Modified from: https://github.com/katleta3000/CancelBlocks/blob/master/CancelBlocks.swift | |
| typealias dispatch_cancelable_block_t = (cancel: Bool) -> (Void) | |
| private func dispatch_after_delay(delay: Double, queue: dispatch_queue_t, block: dispatch_block_t?) -> dispatch_cancelable_block_t? { | |
| guard let block = block else { return nil } | |
| var originalBlock: dispatch_block_t? = block | |
| var cancelableBlock: dispatch_cancelable_block_t? = nil | |
| let delayBlock: dispatch_cancelable_block_t = {(cancel: Bool) -> Void in | |
| if let originalBlock = originalBlock where !cancel { |
| extension Array where Element: Comparable | |
| { | |
| mutating func mergesortInPlace() { | |
| var tmp: [Generator.Element] = [] | |
| tmp.reserveCapacity(numericCast(self.count)) | |
| func merge(lo: Int, _ mi: Int, _ hi: Int) { | |
| tmp.removeAll(keepCapacity: true) | |
| tmp.extend(self[lo..<hi]) |
| import Foundation | |
| // Build 100 random numbers between 0 and 100 | |
| var numbers = Int[]() | |
| for i in 1..100 { | |
| let n = Int(arc4random() % 101) | |
| numbers.append(n) | |
| } | |
| func elementsInRange<T>(a: T[], start: Int, end: Int) -> (T[]) { |
A result type (based on swiftz) that can represent either an error or success:
enum Result<X, T> {
case Err(() -> X)
case Ok(() -> T)
}
Now we need a way to chain multiple results together without lots of nesting of if statements -- or exceptions. To do so, we can define a new bind (result, next) operator (implementation borrowed from swiftz) that operates on Result types (a.k.a flatMap or >>=):
Err, the result is immediately returned.