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use std::ops::{Deref, DerefMut};
use std::rc::{Rc, Weak};
#[derive(Debug)]
pub struct SharedPtr<T: ?Sized> {
rc: Option<Rc<T>>,
}
impl<T> SharedPtr<T> {
#[inline]
pub fn new(v: T) -> SharedPtr<T> {
SharedPtr {
rc: Some(Rc::new(v)),
}
}
#[inline]
pub fn write(&mut self, v: T) {
self.rc = Some(Rc::new(v));
}
#[inline]
pub fn assume_init(self) -> Option<Rc<T>> {
self.rc
}
}
impl<T: ?Sized> SharedPtr<T> {
#[inline]
pub fn zeroed() -> SharedPtr<T> {
SharedPtr { rc: None }
}
#[inline]
pub fn weak(&self) -> Option<Weak<T>> {
self.rc.as_ref().map(Rc::downgrade)
}
#[inline]
pub fn set_null(&mut self) {
self.rc = None;
}
#[inline]
pub fn is_null(&self) -> bool {
self.rc.is_none()
}
#[inline]
pub fn get_mut(&mut self) -> Option<&mut T> {
if let Some(ref mut rc)=self.rc {
Rc::get_mut(rc)
}else{
None
}
}
}
impl <T:Clone> SharedPtr<T> {
#[inline]
pub fn clone_inner(mut self)->Option<T>{
if let Some(ref mut rc)=self.rc {
Some(rc.as_ref().clone())
}else{
None
}
}
}
impl<T: ?Sized> Deref for SharedPtr<T> {
type Target = Rc<T>;
#[inline]
fn deref(&self) -> &Self::Target {
self.rc.as_ref().expect("null shared deref")
}
}
impl<T: ?Sized> DerefMut for SharedPtr<T> {
#[inline]
fn deref_mut(&mut self) -> &mut Self::Target {
self.rc.as_mut().expect("null shared deref mut")
}
}
impl<T: ?Sized> Clone for SharedPtr<T> {
#[inline]
fn clone(&self) -> Self {
Self {
rc: self.rc.clone(),
}
}
}
impl<T: ?Sized> From<Rc<T>> for SharedPtr<T> {
#[inline]
fn from(r: Rc<T>) -> Self {
Self { rc: Some(r) }
}
}
impl<T: ?Sized> Default for SharedPtr<T> {
#[inline]
fn default() -> Self {
SharedPtr::<T>::zeroed()
}
}