48 lines
1.3 KiB
Swift
48 lines
1.3 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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/**
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Object container storing references weakly. Ideal for implementing simple multiple delegation.
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*/
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struct DelegateContainer {
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private let hashTable: NSHashTable<AnyObject>
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var delegates: [AnyObject] {
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return hashTable.allObjects
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}
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init() {
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hashTable = NSHashTable(options: .weakMemory)
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}
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func registerDelegate(_ delegate: AnyObject) {
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hashTable.add(delegate)
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}
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func deregisterDelegate(_ delegate: AnyObject) {
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hashTable.remove(delegate)
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}
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func notifyDelegatesWithBlock(_ block: (AnyObject) -> Void) {
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for delegate in hashTable.allObjects {
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block(delegate)
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}
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}
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}
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