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//! Non-empty [reference-counted][`rc`] collections.
//!
//! [`rc`]: alloc::rc
#![cfg(feature = "alloc")]
#![cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
use alloc::rc::{Rc, Weak};
use crate::array1::Array1;
use crate::borrow1::{CowSlice1, CowSlice1Ext as _, CowStr1, CowStr1Ext as _};
use crate::boxed1::{BoxedSlice1, BoxedSlice1Ext as _, BoxedStr1, BoxedStr1Ext as _};
use crate::iter1::{FromIterator1, IntoIterator1};
use crate::slice1::Slice1;
use crate::str1::Str1;
use crate::vec1::Vec1;
use crate::{EmptyError, MaybeEmpty};
pub type RcSlice1<T> = Rc<Slice1<T>>;
pub trait RcSlice1Ext<T>: Sized {
/// # Safety
///
/// `items` must be non-empty. For example, it is unsound to call this function with
/// [`Rc::<T>::from([])`][`Rc::from`].
///
/// [`Rc::from`]: alloc::rc::Rc::from
unsafe fn from_rc_slice_unchecked(items: Rc<[T]>) -> Self;
fn try_from_rc_slice(items: Rc<[T]>) -> Result<Self, EmptyError<Rc<[T]>>>;
fn from_array1<const N: usize>(items: [T; N]) -> Self
where
[T; N]: Array1;
fn from_boxed_slice1(items: BoxedSlice1<T>) -> Self;
fn from_cow_slice1(items: CowSlice1<T>) -> Self
where
T: Clone;
fn try_into_rc_array<const N: usize>(self) -> Result<Rc<[T; N]>, Self>;
fn into_rc_slice(self) -> Rc<[T]>;
fn as_slice1(&self) -> &Slice1<T>;
}
impl<T> RcSlice1Ext<T> for RcSlice1<T> {
unsafe fn from_rc_slice_unchecked(items: Rc<[T]>) -> Self {
let items = Rc::into_raw(items);
// SAFETY: Client code is responsible for asserting that the input slice is non-empty (and
// so this function is unsafe). This transmutation is safe, because `[T]` and
// `Slice1<T>` have the same representation (`Slice1<T>` is `repr(transparent)`).
// Moreover, the allocator only requires that the memory location and layout are
// the same when deallocating, so dropping the transmuted `Rc` is sound.
unsafe { Rc::from_raw(items as *const Slice1<T>) }
}
fn try_from_rc_slice(items: Rc<[T]>) -> Result<Self, EmptyError<Rc<[T]>>> {
match items.as_ref().cardinality() {
None => Err(EmptyError::from_empty(items)),
// SAFETY: `items` is non-empty.
_ => Ok(unsafe { RcSlice1::from_rc_slice_unchecked(items) }),
}
}
fn from_array1<const N: usize>(items: [T; N]) -> Self
where
[T; N]: Array1,
{
// SAFETY: `items` is non-empty.
unsafe { RcSlice1::from_rc_slice_unchecked(Rc::from(items)) }
}
fn from_boxed_slice1(items: BoxedSlice1<T>) -> Self {
// SAFETY: `items` is non-empty.
unsafe { RcSlice1::from_rc_slice_unchecked(Rc::from(items.into_boxed_slice())) }
}
fn from_cow_slice1(items: CowSlice1<T>) -> Self
where
T: Clone,
{
// SAFETY: `items` is non-empty.
unsafe { RcSlice1::from_rc_slice_unchecked(Rc::from(items.into_cow_slice())) }
}
fn try_into_rc_array<const N: usize>(self) -> Result<Rc<[T; N]>, Self> {
match self.into_rc_slice().try_into() {
Ok(items) => Ok(items),
// SAFETY: `self` and therefore `items` must be non-empty.
Err(items) => Err(unsafe { RcSlice1::from_rc_slice_unchecked(items) }),
}
}
fn into_rc_slice(self) -> Rc<[T]> {
let items = Rc::into_raw(self);
// SAFETY: This transmutation is safe, because `[T]` and `Slice1<T>` have the same
// representation (`Slice1<T>` is `repr(transparent)`). Moreover, the allocator
// only requires that the memory location and layout are the same when
// deallocating, so dropping the transmuted `Rc` is sound.
unsafe { Rc::from_raw(items as *mut [T]) }
}
fn as_slice1(&self) -> &Slice1<T> {
self.as_ref()
}
}
impl<'a, T> From<&'a Slice1<T>> for RcSlice1<T>
where
T: Clone,
{
fn from(items: &'a Slice1<T>) -> Self {
// SAFETY: `items` is non-empty.
unsafe { RcSlice1::from_rc_slice_unchecked(Rc::from(items.as_slice())) }
}
}
impl<T> From<Vec1<T>> for RcSlice1<T> {
fn from(items: Vec1<T>) -> Self {
// SAFETY: `items` is non-empty.
unsafe { RcSlice1::from_rc_slice_unchecked(Rc::from(items.items)) }
}
}
impl<T> FromIterator1<T> for RcSlice1<T> {
fn from_iter1<I>(items: I) -> Self
where
I: IntoIterator1<Item = T>,
{
// SAFETY: `items` is non-empty.
unsafe { RcSlice1::from_rc_slice_unchecked(items.into_iter().collect()) }
}
}
pub type WeakSlice1<T> = Weak<Slice1<T>>;
pub trait WeakSlice1Ext<T>: Sized {
/// # Safety
///
/// `items` must be non-empty. For example, it is unsound to call this function with
/// [`Rc::downgrade(&Rc::<T>::from([]))`][`Rc::downgrade`].
///
/// [`Rc::downgrade`]: alloc::rc::Rc::downgrade
unsafe fn from_weak_slice_unchecked(items: Weak<[T]>) -> Self;
}
impl<T> WeakSlice1Ext<T> for WeakSlice1<T> {
unsafe fn from_weak_slice_unchecked(items: Weak<[T]>) -> Self {
let items = Weak::into_raw(items);
// SAFETY: Client code is responsible for asserting that the input slice is non-empty (and
// so this function is unsafe). This transmutation is safe, because `[T]` and
// `Slice1<T>` have the same representation (`Slice1<T>` is `repr(transparent)`).
// Moreover, the allocator only requires that the memory location and layout are
// the same when deallocating, so dropping the transmuted `Weak` is sound.
unsafe { Weak::from_raw(items as *const Slice1<T>) }
}
}
pub type RcStr1 = Rc<Str1>;
pub trait RcStr1Ext: Sized {
/// # Safety
///
/// `items` must be non-empty. For example, it is unsound to call this function with
/// [`Rc::<str>::from("")`][`Rc::from`].
///
/// [`Rc::from`]: alloc::rc::Rc::from
unsafe fn from_rc_str_unchecked(items: Rc<str>) -> Self;
fn try_from_rc_str(items: Rc<str>) -> Result<Self, EmptyError<Rc<str>>>;
fn from_boxed_str1(items: BoxedStr1) -> Self;
fn from_cow_str1(items: CowStr1) -> Self;
fn into_rc_str(self) -> Rc<str>;
fn as_str1(&self) -> &Str1;
}
impl RcStr1Ext for RcStr1 {
unsafe fn from_rc_str_unchecked(items: Rc<str>) -> Self {
let items = Rc::into_raw(items);
// SAFETY: Client code is responsible for asserting that the input string is non-empty (and
// so this function is unsafe). This transmutation is safe, because `str` and
// `Str1` have the same representation (`Str1` is `repr(transparent)`). Moreover,
// the allocator only requires that the memory location and layout are the same
// when deallocating, so dropping the transmuted `Rc` is sound.
unsafe { Rc::from_raw(items as *const Str1) }
}
fn try_from_rc_str(items: Rc<str>) -> Result<Self, EmptyError<Rc<str>>> {
match items.as_ref().cardinality() {
None => Err(EmptyError::from_empty(items)),
// SAFETY: `items` is non-empty.
_ => Ok(unsafe { RcStr1::from_rc_str_unchecked(items) }),
}
}
fn from_boxed_str1(items: BoxedStr1) -> Self {
// SAFETY: `items` is non-empty.
unsafe { RcStr1::from_rc_str_unchecked(Rc::from(items.into_boxed_str())) }
}
fn from_cow_str1(items: CowStr1) -> Self {
// SAFETY: `items` is non-empty.
unsafe { RcStr1::from_rc_str_unchecked(Rc::from(items.into_cow_str())) }
}
fn into_rc_str(self) -> Rc<str> {
let items = Rc::into_raw(self);
// SAFETY: This transmutation is safe, because `str` and `Str1` have the same
// representation (`Str1` is `repr(transparent)`). Moreover, the allocator only
// requires that the memory location and layout are the same when deallocating, so
// dropping the transmuted `Rc` is sound.
unsafe { Rc::from_raw(items as *mut str) }
}
fn as_str1(&self) -> &Str1 {
self.as_ref()
}
}
pub type WeakStr1 = Weak<Str1>;
pub trait WeakStr1Ext: Sized {
/// # Safety
///
/// `items` must be non-empty. For example, it is unsound to call this function with
/// [`Rc::downgrade(&Rc::<str>::from(""))`][`Rc::downgrade`].
///
/// [`Rc::downgrade`]: alloc::rc::Rc::downgrade
unsafe fn from_weak_str_unchecked(items: Weak<str>) -> Self;
}
impl WeakStr1Ext for WeakStr1 {
unsafe fn from_weak_str_unchecked(items: Weak<str>) -> Self {
let items = Weak::into_raw(items);
// SAFETY: Client code is responsible for asserting that the input string is non-empty (and
// so this function is unsafe). This transmutation is safe, because `str` and
// `Str1` have the same representation (`Str1` is `repr(transparent)`). Moreover,
// the allocator only requires that the memory location and layout are the same
// when deallocating, so dropping the transmuted `Weak` is sound.
unsafe { Weak::from_raw(items as *const Str1) }
}
}