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use core::cell::RefMut;
use core::fmt;
use core::ops::Deref;
use core::pin::Pin;
#[derive(Debug)]
/// A wrapper type for a mutably borrowed value from a `PinCell<T>`.
pub struct PinMut<'a, T: ?Sized> {
pub(crate) inner: Pin<RefMut<'a, T>>,
}
impl<'a, T: ?Sized> Deref for PinMut<'a, T> {
type Target = T;
fn deref(&self) -> &T {
&*self.inner
}
}
impl<'a, T: ?Sized> PinMut<'a, T> {
/// Get a pinned mutable reference to the value inside this wrapper.
pub fn as_mut<'b>(orig: &'b mut PinMut<'a, T>) -> Pin<&'b mut T> {
orig.inner.as_mut()
}
}
/* TODO implement these APIs
impl<'a, T: ?Sized> PinMut<'a, T> {
pub fn map<U, F>(orig: PinMut<'a, T>, f: F) -> PinMut<'a, U> where
F: FnOnce(Pin<&mut T>) -> Pin<&mut U>,
{
panic!()
}
pub fn map_split<U, V, F>(orig: PinMut<'a, T>, f: F) -> (PinMut<'a, U>, PinMut<'a, V>) where
F: FnOnce(Pin<&mut T>) -> (Pin<&mut U>, Pin<&mut V>)
{
panic!()
}
}
*/
impl<'a, T: fmt::Display + ?Sized> fmt::Display for PinMut<'a, T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
<T as fmt::Display>::fmt(&**self, f)
}
}
// TODO CoerceUnsized