use std::sync::{Arc, Weak};
#[cfg(feature="use_std_sync")]
use std::sync::{ RwLockReadGuard, RwLockWriteGuard, TryLockError };
use crate::PreferredRwLockType;
use super::SharedReader;
pub struct WeakSharedReader<T>
{
weak_rw_lock: Weak<PreferredRwLockType<T>>
}
impl<T> WeakSharedReader<T>
{
pub fn new(rw_lock: &Arc<PreferredRwLockType<T>>) -> Self
{
Self
{
weak_rw_lock: Arc::downgrade(rw_lock)
}
}
pub fn upgrade(&self) -> Option<SharedReader<T>>
{
if let Some(rw_lock) = self.weak_rw_lock.upgrade()
{
Some(SharedReader::new(rw_lock))
}
else
{
None
}
}
pub fn strong_count(&self) -> usize
{
self.weak_rw_lock.strong_count()
}
pub fn weak_count(&self) -> usize
{
self.weak_rw_lock.weak_count()
}
}