use std::sync::{Arc, RwLock, TryLockResult, LockResult, RwLockReadGuard};

struct CanOnlyReadLock<T> {
    inner: Arc<RwLock<T>>,
}
impl<T> CanOnlyReadLock<T> {
    pub fn new(t: T) -> (Arc<RwLock<T>>, Self) {
        let lock = Arc::new(RwLock::new(t));
        let lock2 = lock.clone();
        (lock, Self { inner: lock2 })
    }
    pub fn read(&self) -> LockResult<RwLockReadGuard<T>> {
        self.inner.read()
    }
    pub fn try_read(&self) -> TryLockResult<RwLockReadGuard<T>> {
        self.inner.try_read()
    }
}