1/* 2 * Copyright (c) 2022-2025 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16/** 17 * A reference that may be updated atomically. 18 */ 19export class AtomicRef<Value> { 20 value: Value 21 22 /** 23 * Creates a new reference object with the given initial value. 24 * @param value - the new value 25 */ 26 constructor(value: Value) { 27 this.value = value 28 } 29 30 /** 31 * Atomically sets the reference value to the given value and returns the previous one. 32 * @param value - the new value 33 * @returns the previous value 34 */ 35 getAndSet(value: Value): Value { 36 // TODO: replace with the implementation from ArkTS language when it is ready 37 const result = this.value 38 this.value = value 39 return result 40 } 41} 42