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use std::fmt::{self, Debug, Display, Formatter};
use std::ops::{Deref, DerefMut};
use std::sync::Arc;
use super::{ResourceGuard, ResourceInfo};
use crate::shared::Shared;
pub struct Managed<T> {
shared: Option<Arc<Shared<T>>>,
value: Option<ResourceGuard<T>>,
}
impl<T> Managed<T> {
pub(crate) fn new(value: ResourceGuard<T>, shared: Arc<Shared<T>>) -> Self {
Self {
shared: Some(shared),
value: Some(value),
}
}
pub fn discard(mng_self: &mut Self) {
mng_self.value.as_mut().unwrap().discard()
}
pub fn info(mng_self: &Self) -> &ResourceInfo {
mng_self.value.as_ref().unwrap().info()
}
}
impl<T: Debug> Debug for Managed<T> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
if f.alternate() {
f.debug_struct("ManagedResource")
.field("value", &self.deref())
.finish()
} else {
Debug::fmt(self.deref(), f)
}
}
}
impl<T: Display> Display for Managed<T> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
Display::fmt(self.deref(), f)
}
}
impl<T> Deref for Managed<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
self.value.as_ref().unwrap().as_ref().unwrap()
}
}
impl<T> DerefMut for Managed<T> {
fn deref_mut(&mut self) -> &mut Self::Target {
self.value.as_mut().unwrap().as_mut().unwrap()
}
}
impl<T> Drop for Managed<T> {
fn drop(&mut self) {
if let Some(shared) = self.shared.take() {
shared.release(self.value.take().unwrap());
}
}
}