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#![unstable(feature = "pin", issue = "49150")]
use fmt;
use future::{Future, UnsafeFutureObj};
use marker::{Sized, Unpin, Unsize};
use task::{Context, Poll};
use ops::{Deref, DerefMut, CoerceUnsized};
#[unstable(feature = "pin", issue = "49150")]
#[fundamental]
pub struct PinMut<'a, T: ?Sized + 'a> {
inner: &'a mut T,
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: ?Sized + Unpin> PinMut<'a, T> {
#[unstable(feature = "pin", issue = "49150")]
pub fn new(reference: &'a mut T) -> PinMut<'a, T> {
PinMut { inner: reference }
}
#[unstable(feature = "pin", issue = "49150")]
pub fn get_mut(this: PinMut<'a, T>) -> &'a mut T {
this.inner
}
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: ?Sized> PinMut<'a, T> {
#[unstable(feature = "pin", issue = "49150")]
pub unsafe fn new_unchecked(reference: &'a mut T) -> PinMut<'a, T> {
PinMut { inner: reference }
}
#[unstable(feature = "pin", issue = "49150")]
pub fn reborrow<'b>(&'b mut self) -> PinMut<'b, T> {
PinMut { inner: self.inner }
}
#[unstable(feature = "pin", issue = "49150")]
pub unsafe fn get_mut_unchecked(this: PinMut<'a, T>) -> &'a mut T {
this.inner
}
#[unstable(feature = "pin", issue = "49150")]
pub unsafe fn map_unchecked<U, F>(this: PinMut<'a, T>, f: F) -> PinMut<'a, U> where
F: FnOnce(&mut T) -> &mut U
{
PinMut { inner: f(this.inner) }
}
#[unstable(feature = "pin", issue = "49150")]
pub fn set(this: PinMut<'a, T>, value: T)
where T: Sized,
{
*this.inner = value;
}
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: ?Sized> Deref for PinMut<'a, T> {
type Target = T;
fn deref(&self) -> &T {
&*self.inner
}
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: ?Sized + Unpin> DerefMut for PinMut<'a, T> {
fn deref_mut(&mut self) -> &mut T {
self.inner
}
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: fmt::Debug + ?Sized> fmt::Debug for PinMut<'a, T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(&**self, f)
}
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: fmt::Display + ?Sized> fmt::Display for PinMut<'a, T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&**self, f)
}
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: ?Sized> fmt::Pointer for PinMut<'a, T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Pointer::fmt(&(&*self.inner as *const T), f)
}
}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<PinMut<'a, U>> for PinMut<'a, T> {}
#[unstable(feature = "pin", issue = "49150")]
impl<'a, T: ?Sized> Unpin for PinMut<'a, T> {}
#[unstable(feature = "futures_api", issue = "50547")]
unsafe impl<'a, T, F> UnsafeFutureObj<'a, T> for PinMut<'a, F>
where F: Future<Output = T> + 'a
{
fn into_raw(self) -> *mut () {
unsafe { PinMut::get_mut_unchecked(self) as *mut F as *mut () }
}
unsafe fn poll(ptr: *mut (), cx: &mut Context) -> Poll<T> {
PinMut::new_unchecked(&mut *(ptr as *mut F)).poll(cx)
}
unsafe fn drop(_ptr: *mut ()) {}
}