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Promise+Any.swift
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Promise+Any.swift
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/*
* Hydra
* Fullfeatured lightweight Promise & Await Library for Swift
*
* Created by: Daniele Margutti
* Email: hello@danielemargutti.com
* Web: http://www.danielemargutti.com
* Twitter: @danielemargutti
*
* Copyright © 2017 Daniele Margutti
*
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
import Foundation
public extension Promise {
/// Returns a Promise that resolves as soon as one passed in Promise resolves
///
/// - Parameters:
/// - context: dispatch queue to run the handler on (if not specified `background` context is used)
/// - promises: array of Promises to resolve
/// - Returns: Promise that resolves to first resolved Promise
public static func any<L>(_ context: Context? = nil, _ promises: Promise<L>...) -> Promise<L> {
guard Array(promises).count > 0 else {
// if number of passed promises is zero a rejected promises is returned
return Promise<L>(asRejected: PromiseError.invalidInput)
}
let ctx = context ?? .background
let anyPromise = Promise<L> { (resolve, reject) in
for currentPromise in promises {
// first promises which resolve is returned
currentPromise.addObserver(in: ctx, fulfill: resolve, reject: reject)
}
}
return anyPromise
}
}