use parking_lot::RwLock as ParkingLotRwLock;
use std::sync::{Arc, RwLock};
pub trait RwLockExt<T> {
fn with<Y, F: Fn(&T) -> Y>(&self, f: F) -> Y;
fn with_mut<Y, F: FnMut(&mut T) -> Y>(&self, f: F) -> Y;
}
impl<T> RwLockExt<T> for Arc<RwLock<T>> {
fn with<Y, F: Fn(&T) -> Y>(&self, f: F) -> Y {
let r = self.read().unwrap();
f(&r)
}
fn with_mut<Y, F: FnMut(&mut T) -> Y>(&self, mut f: F) -> Y {
let mut w = self.write().unwrap();
f(&mut w)
}
}
impl<T> RwLockExt<T> for Arc<ParkingLotRwLock<T>> {
fn with<Y, F: Fn(&T) -> Y>(&self, f: F) -> Y {
let r = self.read();
f(&r)
}
fn with_mut<Y, F: FnMut(&mut T) -> Y>(&self, mut f: F) -> Y {
let mut w = self.write();
f(&mut w)
}
}