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use std::cell::{Ref, RefCell, RefMut};
use std::fmt;
use std::hash::{Hash, Hasher};
use std::rc::Rc;
#[derive(Debug)]
pub struct Shared<T: ?Sized>(Rc<RefCell<T>>);
impl<T: PartialEq> PartialEq for Shared<T> {
#[inline]
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
impl<T: ?Sized> Clone for Shared<T> {
fn clone(&self) -> Shared<T> {
Self(Rc::clone(&self.0))
}
}
impl<T: Eq> Eq for Shared<T> {}
impl<T: Hash> Hash for Shared<T> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.borrow().hash(state);
}
}
impl<T: Default> Default for Shared<T> {
fn default() -> Self {
Self::new(Default::default())
}
}
impl<T: fmt::Display> fmt::Display for Shared<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.borrow())
}
}
impl<T> Shared<T> {
pub fn new(t: T) -> Self {
Self(Rc::new(RefCell::new(t)))
}
#[inline]
pub fn into_inner(self) -> T {
let refcell = match Rc::try_unwrap(self.0) {
Ok(refcell) => refcell,
Err(_rc) => panic!("unwrapping failed"),
};
RefCell::into_inner(refcell)
}
}
impl<T: ?Sized> Shared<T> {
#[inline]
pub fn copy(&self) -> Self {
Self(self.0.clone())
}
#[inline]
pub fn borrow(&self) -> Ref<'_, T> {
RefCell::borrow(&self.0)
}
#[inline]
pub fn borrow_mut(&self) -> RefMut<'_, T> {
RefCell::borrow_mut(&self.0)
}
#[inline]
pub fn as_ptr(&self) -> *mut T {
RefCell::as_ptr(&self.0)
}
#[inline]
pub fn try_borrow_mut(&self) -> Result<RefMut<'_, T>, std::cell::BorrowMutError> {
RefCell::try_borrow_mut(&self.0)
}
pub fn can_borrow(&self) -> bool {
RefCell::try_borrow(&self.0).is_ok()
}
pub fn can_borrow_mut(&self) -> bool {
RefCell::try_borrow_mut(&self.0).is_ok()
}
}
impl<T: Clone> Shared<T> {
#[inline]
pub fn clone_inner(&self) -> T {
self.borrow().clone()
}
}