Add liballoc APIs.

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boats 2018-03-15 12:55:37 -07:00
parent 918ef671b0
commit e3c5f6958f
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2 changed files with 96 additions and 2 deletions
src/liballoc

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@ -64,8 +64,8 @@ use core::cmp::Ordering;
use core::fmt;
use core::hash::{self, Hash, Hasher};
use core::iter::FusedIterator;
use core::marker::{self, Unsize};
use core::mem;
use core::marker::{self, Unpin, Unsize};
use core::mem::{self, Pin};
use core::ops::{CoerceUnsized, Deref, DerefMut, Generator, GeneratorState};
use core::ops::{BoxPlace, Boxed, InPlace, Place, Placer};
use core::ptr::{self, NonNull, Unique};
@ -896,3 +896,96 @@ impl<T> Generator for Box<T>
(**self).resume()
}
}
/// A pinned, heap allocated reference.
#[unstable(feature = "pin", issue = "0")]
pub struct PinBox<T: ?Sized> {
inner: Box<T>,
}
#[unstable(feature = "pin", issue = "0")]
impl<T> PinBox<T> {
/// Allocate memory on the heap, move the data into it and pin it.
#[unstable(feature = "pin", issue = "0")]
pub fn new(data: T) -> PinBox<T> {
PinBox { inner: Box::new(data) }
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: ?Sized> PinBox<T> {
/// Get a pinned reference to the data in this PinBox.
pub fn as_pin<'a>(&'a mut self) -> Pin<'a, T> {
unsafe { Pin::new_unchecked(&mut *self.inner) }
}
/// Get a mutable reference to the data inside this PinBox.
///
/// This function is unsafe. Users must guarantee that the data is never
/// moved out of this reference.
pub unsafe fn get_mut<'a>(this: &'a mut PinBox<T>) -> &'a mut T {
&mut *this.inner
}
/// Convert this PinBox into an unpinned Box.
///
/// This function is unsafe. Users must guarantee that the data is never
/// moved out of the box.
pub unsafe fn unpin(this: PinBox<T>) -> Box<T> {
this.inner
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: ?Sized> From<Box<T>> for PinBox<T> {
fn from(boxed: Box<T>) -> PinBox<T> {
PinBox { inner: boxed }
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: Unpin + ?Sized> From<PinBox<T>> for Box<T> {
fn from(pinned: PinBox<T>) -> Box<T> {
pinned.inner
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: ?Sized> Deref for PinBox<T> {
type Target = T;
fn deref(&self) -> &T {
&*self.inner
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: Unpin + ?Sized> DerefMut for PinBox<T> {
fn deref_mut(&mut self) -> &mut T {
&mut *self.inner
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: fmt::Display + ?Sized> fmt::Display for PinBox<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(&*self.inner, f)
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: fmt::Debug + ?Sized> fmt::Debug for PinBox<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(&*self.inner, f)
}
}
#[unstable(feature = "pin", issue = "0")]
impl<T: ?Sized> fmt::Pointer for PinBox<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// It's not possible to extract the inner Uniq directly from the Box,
// instead we cast it to a *const which aliases the Unique
let ptr: *const T = &*self.inner;
fmt::Pointer::fmt(&ptr, f)
}
}

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@ -107,6 +107,7 @@
#![feature(offset_to)]
#![feature(optin_builtin_traits)]
#![feature(pattern)]
#![feature(pin)]
#![feature(placement_in_syntax)]
#![feature(placement_new_protocol)]
#![feature(ptr_internals)]