1 // Copyright 2024, The Android Open Source Project 2 // 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 use core::{ 16 cell::RefCell, 17 ops::{Deref, DerefMut}, 18 }; 19 20 /// A shared instance guarded by `RefCell`. 21 pub struct Shared<T>(RefCell<T>); 22 23 impl<T> From<T> for Shared<T> { from(val: T) -> Self24 fn from(val: T) -> Self { 25 Shared(val.into()) 26 } 27 } 28 29 impl<T> Deref for Shared<T> { 30 type Target = RefCell<T>; 31 deref(&self) -> &Self::Target32 fn deref(&self) -> &Self::Target { 33 &self.0 34 } 35 } 36 37 impl<T> DerefMut for Shared<T> { deref_mut(&mut self) -> &mut Self::Target38 fn deref_mut(&mut self) -> &mut Self::Target { 39 &mut self.0 40 } 41 } 42