Struct Rc 

pub struct Rc<T, A = Global>
where
    A: Allocator,
    T: ?Sized,
{ /* private fields */ }

A single-threaded reference-counting pointer. ‘Rc’ stands for ‘Reference Counted’.

See the module-level documentation for more details.

The inherent methods of Rc are all associated functions, which means that you have to call them as e.g., Rc::get_mut(&mut value) instead of value.get_mut(). This avoids conflicts with methods of the inner type T.

Implementations

impl<T> Rc<T>

pub fn new(value: T) -> Rc<T>

Constructs a new Rc<T>.

Examples

use std::rc::Rc;

let five = Rc::new(5);

pub fn new_cyclic<F>(data_fn: F) -> Rc<T>

where F: FnOnce(&Weak<T>) -> T,

Constructs a new Rc<T> while giving you a Weak<T> to the allocation, to allow you to construct a T which holds a weak pointer to itself.

Generally, a structure circularly referencing itself, either directly or indirectly, should not hold a strong reference to itself to prevent a memory leak. Using this function, you get access to the weak pointer during the initialization of T, before the Rc<T> is created, such that you can clone and store it inside the T.

new_cyclic first allocates the managed allocation for the Rc<T>, then calls your closure, giving it a Weak<T> to this allocation, and only afterwards completes the construction of the Rc<T> by placing the T returned from your closure into the allocation.

Since the new Rc<T> is not fully-constructed until Rc<T>::new_cyclic returns, calling upgrade on the weak reference inside your closure will fail and result in a None value.

Panics

If data_fn panics, the panic is propagated to the caller, and the temporary Weak<T> is dropped normally.

Examples

use std::rc::{Rc, Weak};

struct Gadget {
    me: Weak<Gadget>,
}

impl Gadget {
    /// Constructs a reference counted Gadget.
    fn new() -> Rc<Self> {
        // `me` is a `Weak<Gadget>` pointing at the new allocation of the
        // `Rc` we're constructing.
        Rc::new_cyclic(|me| {
            // Create the actual struct here.
            Gadget { me: me.clone() }
        })
    }

    /// Returns a reference counted pointer to Self.
    fn me(&self) -> Rc<Self> {
        self.me.upgrade().unwrap()
    }
}

pub fn new_uninit() -> Rc<MaybeUninit<T>>

Constructs a new Rc with uninitialized contents.

Examples

use std::rc::Rc;

let mut five = Rc::<u32>::new_uninit();

// Deferred initialization:
Rc::get_mut(&mut five).unwrap().write(5);

let five = unsafe { five.assume_init() };

assert_eq!(*five, 5)

pub fn new_zeroed() -> Rc<MaybeUninit<T>>

Constructs a new Rc with uninitialized contents, with the memory being filled with 0 bytes.

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

use std::rc::Rc;

let zero = Rc::<u32>::new_zeroed();
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0)

pub fn try_new(value: T) -> Result<Rc<T>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc<T>, returning an error if the allocation fails

Examples

#![feature(allocator_api)]
use std::rc::Rc;

let five = Rc::try_new(5);

pub fn try_new_uninit() -> Result<Rc<MaybeUninit<T>>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc with uninitialized contents, returning an error if the allocation fails

Examples

#![feature(allocator_api)]

use std::rc::Rc;

let mut five = Rc::<u32>::try_new_uninit()?;

// Deferred initialization:
Rc::get_mut(&mut five).unwrap().write(5);

let five = unsafe { five.assume_init() };

assert_eq!(*five, 5);

pub fn try_new_zeroed() -> Result<Rc<MaybeUninit<T>>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc with uninitialized contents, with the memory being filled with 0 bytes, returning an error if the allocation fails

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(allocator_api)]

use std::rc::Rc;

let zero = Rc::<u32>::try_new_zeroed()?;
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0);

pub fn pin(value: T) -> Pin<Rc<T>>

Constructs a new Pin<Rc<T>>. If T does not implement Unpin, then value will be pinned in memory and unable to be moved.

pub fn map<U>(this: Rc<T>, f: impl FnOnce(&T) -> U) -> Rc<U>

🔬This is a nightly-only experimental API. (smart_pointer_try_map)

Maps the value in an Rc, reusing the allocation if possible.

f is called on a reference to the value in the Rc, and the result is returned, also in an Rc.

Note: this is an associated function, which means that you have to call it as Rc::map(r, f) instead of r.map(f). This is so that there is no conflict with a method on the inner type.

Examples

#![feature(smart_pointer_try_map)]

use std::rc::Rc;

let r = Rc::new(7);
let new = Rc::map(r, |i| i + 7);
assert_eq!(*new, 14);

pub fn try_map<R>( this: Rc<T>, f: impl FnOnce(&T) -> R, ) -> <<R as Try>::Residual as Residual<Rc<<R as Try>::Output>>>::TryType

where R: Try, <R as Try>::Residual: Residual<Rc<<R as Try>::Output>>,

🔬This is a nightly-only experimental API. (smart_pointer_try_map)

Attempts to map the value in an Rc, reusing the allocation if possible.

f is called on a reference to the value in the Rc, and if the operation succeeds, the result is returned, also in an Rc.

Note: this is an associated function, which means that you have to call it as Rc::try_map(r, f) instead of r.try_map(f). This is so that there is no conflict with a method on the inner type.

Examples

#![feature(smart_pointer_try_map)]

use std::rc::Rc;

let b = Rc::new(7);
let new = Rc::try_map(b, |&i| u32::try_from(i)).unwrap();
assert_eq!(*new, 7);

impl<T, A> Rc<T, A>

where A: Allocator,

pub fn new_in(value: T, alloc: A) -> Rc<T, A>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc in the provided allocator.

Examples

#![feature(allocator_api)]
use std::rc::Rc;
use std::alloc::System;

let five = Rc::new_in(5, System);

pub fn new_uninit_in(alloc: A) -> Rc<MaybeUninit<T>, A>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc with uninitialized contents in the provided allocator.

Examples

#![feature(get_mut_unchecked)]
#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let mut five = Rc::<u32, _>::new_uninit_in(System);

let five = unsafe {
    // Deferred initialization:
    Rc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);

    five.assume_init()
};

assert_eq!(*five, 5)

pub fn new_zeroed_in(alloc: A) -> Rc<MaybeUninit<T>, A>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc with uninitialized contents, with the memory being filled with 0 bytes, in the provided allocator.

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let zero = Rc::<u32, _>::new_zeroed_in(System);
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0)

pub fn new_cyclic_in<F>(data_fn: F, alloc: A) -> Rc<T, A>

where F: FnOnce(&Weak<T, A>) -> T,

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc<T, A> in the given allocator while giving you a Weak<T, A> to the allocation, to allow you to construct a T which holds a weak pointer to itself.

Generally, a structure circularly referencing itself, either directly or indirectly, should not hold a strong reference to itself to prevent a memory leak. Using this function, you get access to the weak pointer during the initialization of T, before the Rc<T, A> is created, such that you can clone and store it inside the T.

new_cyclic_in first allocates the managed allocation for the Rc<T, A>, then calls your closure, giving it a Weak<T, A> to this allocation, and only afterwards completes the construction of the Rc<T, A> by placing the T returned from your closure into the allocation.

Since the new Rc<T, A> is not fully-constructed until Rc<T, A>::new_cyclic_in returns, calling upgrade on the weak reference inside your closure will fail and result in a None value.

Panics

If data_fn panics, the panic is propagated to the caller, and the temporary Weak<T, A> is dropped normally.

Examples

See new_cyclic.

pub fn try_new_in(value: T, alloc: A) -> Result<Rc<T, A>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc<T> in the provided allocator, returning an error if the allocation fails

Examples

#![feature(allocator_api)]
use std::rc::Rc;
use std::alloc::System;

let five = Rc::try_new_in(5, System);

pub fn try_new_uninit_in(alloc: A) -> Result<Rc<MaybeUninit<T>, A>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc with uninitialized contents, in the provided allocator, returning an error if the allocation fails

Examples

#![feature(allocator_api)]
#![feature(get_mut_unchecked)]

use std::rc::Rc;
use std::alloc::System;

let mut five = Rc::<u32, _>::try_new_uninit_in(System)?;

let five = unsafe {
    // Deferred initialization:
    Rc::get_mut_unchecked(&mut five).as_mut_ptr().write(5);

    five.assume_init()
};

assert_eq!(*five, 5);

pub fn try_new_zeroed_in(alloc: A) -> Result<Rc<MaybeUninit<T>, A>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Rc with uninitialized contents, with the memory being filled with 0 bytes, in the provided allocator, returning an error if the allocation fails

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let zero = Rc::<u32, _>::try_new_zeroed_in(System)?;
let zero = unsafe { zero.assume_init() };

assert_eq!(*zero, 0);

pub fn pin_in(value: T, alloc: A) -> Pin<Rc<T, A>>

where A: 'static,

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new Pin<Rc<T>> in the provided allocator. If T does not implement Unpin, then value will be pinned in memory and unable to be moved.

pub fn try_unwrap(this: Rc<T, A>) -> Result<T, Rc<T, A>>

Returns the inner value, if the Rc has exactly one strong reference.

Otherwise, an Err is returned with the same Rc that was passed in.

This will succeed even if there are outstanding weak references.

Examples

use std::rc::Rc;

let x = Rc::new(3);
assert_eq!(Rc::try_unwrap(x), Ok(3));

let x = Rc::new(4);
let _y = Rc::clone(&x);
assert_eq!(*Rc::try_unwrap(x).unwrap_err(), 4);

pub fn into_inner(this: Rc<T, A>) -> Option<T>

Returns the inner value, if the Rc has exactly one strong reference.

Otherwise, None is returned and the Rc is dropped.

This will succeed even if there are outstanding weak references.

If Rc::into_inner is called on every clone of this Rc, it is guaranteed that exactly one of the calls returns the inner value. This means in particular that the inner value is not dropped.

Rc::try_unwrap is conceptually similar to Rc::into_inner. And while they are meant for different use-cases, Rc::into_inner(this) is in fact equivalent to Rc::try_unwrap(this).ok(). (Note that the same kind of equivalence does not hold true for Arc, due to race conditions that do not apply to Rc!)

Examples

use std::rc::Rc;

let x = Rc::new(3);
assert_eq!(Rc::into_inner(x), Some(3));

let x = Rc::new(4);
let y = Rc::clone(&x);

assert_eq!(Rc::into_inner(y), None);
assert_eq!(Rc::into_inner(x), Some(4));

impl<T> Rc<[T]>

pub fn new_uninit_slice(len: usize) -> Rc<[MaybeUninit<T>]>

Constructs a new reference-counted slice with uninitialized contents.

Examples

use std::rc::Rc;

let mut values = Rc::<[u32]>::new_uninit_slice(3);

// Deferred initialization:
let data = Rc::get_mut(&mut values).unwrap();
data[0].write(1);
data[1].write(2);
data[2].write(3);

let values = unsafe { values.assume_init() };

assert_eq!(*values, [1, 2, 3])

pub fn new_zeroed_slice(len: usize) -> Rc<[MaybeUninit<T>]>

Constructs a new reference-counted slice with uninitialized contents, with the memory being filled with 0 bytes.

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

use std::rc::Rc;

let values = Rc::<[u32]>::new_zeroed_slice(3);
let values = unsafe { values.assume_init() };

assert_eq!(*values, [0, 0, 0])

pub fn into_array<const N: usize>(self) -> Option<Rc<[T; N]>>

🔬This is a nightly-only experimental API. (alloc_slice_into_array)

Converts the reference-counted slice into a reference-counted array.

This operation does not reallocate; the underlying array of the slice is simply reinterpreted as an array type.

If N is not exactly equal to the length of self, then this method returns None.

impl<T, A> Rc<[T], A>

where A: Allocator,

pub fn new_uninit_slice_in(len: usize, alloc: A) -> Rc<[MaybeUninit<T>], A>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new reference-counted slice with uninitialized contents.

Examples

#![feature(get_mut_unchecked)]
#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let mut values = Rc::<[u32], _>::new_uninit_slice_in(3, System);

let values = unsafe {
    // Deferred initialization:
    Rc::get_mut_unchecked(&mut values)[0].as_mut_ptr().write(1);
    Rc::get_mut_unchecked(&mut values)[1].as_mut_ptr().write(2);
    Rc::get_mut_unchecked(&mut values)[2].as_mut_ptr().write(3);

    values.assume_init()
};

assert_eq!(*values, [1, 2, 3])

pub fn new_zeroed_slice_in(len: usize, alloc: A) -> Rc<[MaybeUninit<T>], A>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs a new reference-counted slice with uninitialized contents, with the memory being filled with 0 bytes.

See MaybeUninit::zeroed for examples of correct and incorrect usage of this method.

Examples

#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let values = Rc::<[u32], _>::new_zeroed_slice_in(3, System);
let values = unsafe { values.assume_init() };

assert_eq!(*values, [0, 0, 0])

impl<T, A> Rc<MaybeUninit<T>, A>

where A: Allocator,

pub unsafe fn assume_init(self) -> Rc<T, A>

Converts to Rc<T>.

Safety

As with MaybeUninit::assume_init, it is up to the caller to guarantee that the inner value really is in an initialized state. Calling this when the content is not yet fully initialized causes immediate undefined behavior.

Examples

use std::rc::Rc;

let mut five = Rc::<u32>::new_uninit();

// Deferred initialization:
Rc::get_mut(&mut five).unwrap().write(5);

let five = unsafe { five.assume_init() };

assert_eq!(*five, 5)

impl<T> Rc<T>

where T: CloneToUninit + ?Sized,

pub fn clone_from_ref(value: &T) -> Rc<T>

🔬This is a nightly-only experimental API. (clone_from_ref)

Constructs a new Rc<T> with a clone of value.

Examples

#![feature(clone_from_ref)]
use std::rc::Rc;

let hello: Rc<str> = Rc::clone_from_ref("hello");

pub fn try_clone_from_ref(value: &T) -> Result<Rc<T>, AllocError>

🔬This is a nightly-only experimental API. (clone_from_ref)

Constructs a new Rc<T> with a clone of value, returning an error if allocation fails

Examples

#![feature(clone_from_ref)]
#![feature(allocator_api)]
use std::rc::Rc;

let hello: Rc<str> = Rc::try_clone_from_ref("hello")?;

impl<T, A> Rc<T, A>

where T: CloneToUninit + ?Sized, A: Allocator,

pub fn clone_from_ref_in(value: &T, alloc: A) -> Rc<T, A>

🔬This is a nightly-only experimental API. (clone_from_ref)

Constructs a new Rc<T> with a clone of value in the provided allocator.

Examples

#![feature(clone_from_ref)]
#![feature(allocator_api)]
use std::rc::Rc;
use std::alloc::System;

let hello: Rc<str, System> = Rc::clone_from_ref_in("hello", System);

pub fn try_clone_from_ref_in( value: &T, alloc: A, ) -> Result<Rc<T, A>, AllocError>

🔬This is a nightly-only experimental API. (clone_from_ref)

Constructs a new Rc<T> with a clone of value in the provided allocator, returning an error if allocation fails

Examples

#![feature(clone_from_ref)]
#![feature(allocator_api)]
use std::rc::Rc;
use std::alloc::System;

let hello: Rc<str, System> = Rc::try_clone_from_ref_in("hello", System)?;

impl<T, A> Rc<[MaybeUninit<T>], A>

where A: Allocator,

pub unsafe fn assume_init(self) -> Rc<[T], A>

Converts to Rc<[T]>.

Safety

As with MaybeUninit::assume_init, it is up to the caller to guarantee that the inner value really is in an initialized state. Calling this when the content is not yet fully initialized causes immediate undefined behavior.

Examples

use std::rc::Rc;

let mut values = Rc::<[u32]>::new_uninit_slice(3);

// Deferred initialization:
let data = Rc::get_mut(&mut values).unwrap();
data[0].write(1);
data[1].write(2);
data[2].write(3);

let values = unsafe { values.assume_init() };

assert_eq!(*values, [1, 2, 3])

impl<T> Rc<T>

where T: ?Sized,

pub unsafe fn from_raw(ptr: *const T) -> Rc<T>

Constructs an Rc<T> from a raw pointer.

The raw pointer must have been previously returned by a call to Rc<U>::into_raw with the following requirements:

• If U is sized, it must have the same size and alignment as T. This is trivially true if U is T.
• If U is unsized, its data pointer must have the same size and alignment as T. This is trivially true if Rc<U> was constructed through Rc<T> and then converted to Rc<U> through an unsized coercion.

Note that if U or U’s data pointer is not T but has the same size and alignment, this is basically like transmuting references of different types. See mem::transmute for more information on what restrictions apply in this case.

The raw pointer must point to a block of memory allocated by the global allocator

The user of from_raw has to make sure a specific value of T is only dropped once.

This function is unsafe because improper use may lead to memory unsafety, even if the returned Rc<T> is never accessed.

Examples

use std::rc::Rc;

let x = Rc::new("hello".to_owned());
let x_ptr = Rc::into_raw(x);

unsafe {
    // Convert back to an `Rc` to prevent leak.
    let x = Rc::from_raw(x_ptr);
    assert_eq!(&*x, "hello");

    // Further calls to `Rc::from_raw(x_ptr)` would be memory-unsafe.
}

// The memory was freed when `x` went out of scope above, so `x_ptr` is now dangling!

Convert a slice back into its original array:

use std::rc::Rc;

let x: Rc<[u32]> = Rc::new([1, 2, 3]);
let x_ptr: *const [u32] = Rc::into_raw(x);

unsafe {
    let x: Rc<[u32; 3]> = Rc::from_raw(x_ptr.cast::<[u32; 3]>());
    assert_eq!(&*x, &[1, 2, 3]);
}

pub fn into_raw(this: Rc<T>) -> *const T

Consumes the Rc, returning the wrapped pointer.

To avoid a memory leak the pointer must be converted back to an Rc using Rc::from_raw.

Examples

use std::rc::Rc;

let x = Rc::new("hello".to_owned());
let x_ptr = Rc::into_raw(x);
assert_eq!(unsafe { &*x_ptr }, "hello");

pub unsafe fn increment_strong_count(ptr: *const T)

Increments the strong reference count on the Rc<T> associated with the provided pointer by one.

Safety

The pointer must have been obtained through Rc::into_raw and must satisfy the same layout requirements specified in Rc::from_raw_in. The associated Rc instance must be valid (i.e. the strong count must be at least 1) for the duration of this method, and ptr must point to a block of memory allocated by the global allocator.

Examples

use std::rc::Rc;

let five = Rc::new(5);

unsafe {
    let ptr = Rc::into_raw(five);
    Rc::increment_strong_count(ptr);

    let five = Rc::from_raw(ptr);
    assert_eq!(2, Rc::strong_count(&five));
}

pub unsafe fn decrement_strong_count(ptr: *const T)

Decrements the strong reference count on the Rc<T> associated with the provided pointer by one.

Safety

The pointer must have been obtained through Rc::into_rawand must satisfy the same layout requirements specified in Rc::from_raw_in. The associated Rc instance must be valid (i.e. the strong count must be at least 1) when invoking this method, and ptr must point to a block of memory allocated by the global allocator. This method can be used to release the final Rc and backing storage, but should not be called after the final Rc has been released.

Examples

use std::rc::Rc;

let five = Rc::new(5);

unsafe {
    let ptr = Rc::into_raw(five);
    Rc::increment_strong_count(ptr);

    let five = Rc::from_raw(ptr);
    assert_eq!(2, Rc::strong_count(&five));
    Rc::decrement_strong_count(ptr);
    assert_eq!(1, Rc::strong_count(&five));
}

impl<T, A> Rc<T, A>

where A: Allocator, T: ?Sized,

pub fn allocator(this: &Rc<T, A>) -> &A

🔬This is a nightly-only experimental API. (allocator_api)

Returns a reference to the underlying allocator.

Note: this is an associated function, which means that you have to call it as Rc::allocator(&r) instead of r.allocator(). This is so that there is no conflict with a method on the inner type.

pub fn into_raw_with_allocator(this: Rc<T, A>) -> (*const T, A)

🔬This is a nightly-only experimental API. (allocator_api)

Consumes the Rc, returning the wrapped pointer and allocator.

To avoid a memory leak the pointer must be converted back to an Rc using Rc::from_raw_in.

Examples

#![feature(allocator_api)]
use std::rc::Rc;
use std::alloc::System;

let x = Rc::new_in("hello".to_owned(), System);
let (ptr, alloc) = Rc::into_raw_with_allocator(x);
assert_eq!(unsafe { &*ptr }, "hello");
let x = unsafe { Rc::from_raw_in(ptr, alloc) };
assert_eq!(&*x, "hello");

pub fn as_ptr(this: &Rc<T, A>) -> *const T

Provides a raw pointer to the data.

The counts are not affected in any way and the Rc is not consumed. The pointer is valid for as long as there are strong counts in the Rc.

Examples

use std::rc::Rc;

let x = Rc::new(0);
let y = Rc::clone(&x);
let x_ptr = Rc::as_ptr(&x);
assert_eq!(x_ptr, Rc::as_ptr(&y));
assert_eq!(unsafe { *x_ptr }, 0);

pub unsafe fn from_raw_in(ptr: *const T, alloc: A) -> Rc<T, A>

🔬This is a nightly-only experimental API. (allocator_api)

Constructs an Rc<T, A> from a raw pointer in the provided allocator.

The raw pointer must have been previously returned by a call to Rc<U, A>::into_raw with the following requirements:

• If U is sized, it must have the same size and alignment as T. This is trivially true if U is T.
• If U is unsized, its data pointer must have the same size and alignment as T. This is trivially true if Rc<U> was constructed through Rc<T> and then converted to Rc<U> through an unsized coercion.

Note that if U or U’s data pointer is not T but has the same size and alignment, this is basically like transmuting references of different types. See mem::transmute for more information on what restrictions apply in this case.

The raw pointer must point to a block of memory allocated by alloc

The user of from_raw has to make sure a specific value of T is only dropped once.

This function is unsafe because improper use may lead to memory unsafety, even if the returned Rc<T> is never accessed.

Examples

#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let x = Rc::new_in("hello".to_owned(), System);
let (x_ptr, _alloc) = Rc::into_raw_with_allocator(x);

unsafe {
    // Convert back to an `Rc` to prevent leak.
    let x = Rc::from_raw_in(x_ptr, System);
    assert_eq!(&*x, "hello");

    // Further calls to `Rc::from_raw(x_ptr)` would be memory-unsafe.
}

// The memory was freed when `x` went out of scope above, so `x_ptr` is now dangling!

Convert a slice back into its original array:

#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let x: Rc<[u32], _> = Rc::new_in([1, 2, 3], System);
let x_ptr: *const [u32] = Rc::into_raw_with_allocator(x).0;

unsafe {
    let x: Rc<[u32; 3], _> = Rc::from_raw_in(x_ptr.cast::<[u32; 3]>(), System);
    assert_eq!(&*x, &[1, 2, 3]);
}

pub fn downgrade(this: &Rc<T, A>) -> Weak<T, A>

where A: Clone,

Creates a new Weak pointer to this allocation.

Examples

use std::rc::Rc;

let five = Rc::new(5);

let weak_five = Rc::downgrade(&five);

pub fn weak_count(this: &Rc<T, A>) -> usize

Gets the number of Weak pointers to this allocation.

Examples

use std::rc::Rc;

let five = Rc::new(5);
let _weak_five = Rc::downgrade(&five);

assert_eq!(1, Rc::weak_count(&five));

pub fn strong_count(this: &Rc<T, A>) -> usize

Gets the number of strong (Rc) pointers to this allocation.

Examples

use std::rc::Rc;

let five = Rc::new(5);
let _also_five = Rc::clone(&five);

assert_eq!(2, Rc::strong_count(&five));

pub unsafe fn increment_strong_count_in(ptr: *const T, alloc: A)

where A: Clone,

🔬This is a nightly-only experimental API. (allocator_api)

Increments the strong reference count on the Rc<T> associated with the provided pointer by one.

Safety

The pointer must have been obtained through Rc::into_raw and must satisfy the same layout requirements specified in Rc::from_raw_in. The associated Rc instance must be valid (i.e. the strong count must be at least 1) for the duration of this method, and ptr must point to a block of memory allocated by alloc.

Examples

#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let five = Rc::new_in(5, System);

unsafe {
    let (ptr, _alloc) = Rc::into_raw_with_allocator(five);
    Rc::increment_strong_count_in(ptr, System);

    let five = Rc::from_raw_in(ptr, System);
    assert_eq!(2, Rc::strong_count(&five));
}

pub unsafe fn decrement_strong_count_in(ptr: *const T, alloc: A)

🔬This is a nightly-only experimental API. (allocator_api)

Decrements the strong reference count on the Rc<T> associated with the provided pointer by one.

Safety

The pointer must have been obtained through Rc::into_rawand must satisfy the same layout requirements specified in Rc::from_raw_in. The associated Rc instance must be valid (i.e. the strong count must be at least 1) when invoking this method, and ptr must point to a block of memory allocated by alloc. This method can be used to release the final Rc and backing storage, but should not be called after the final Rc has been released.

Examples

#![feature(allocator_api)]

use std::rc::Rc;
use std::alloc::System;

let five = Rc::new_in(5, System);

unsafe {
    let (ptr, _alloc) = Rc::into_raw_with_allocator(five);
    Rc::increment_strong_count_in(ptr, System);

    let five = Rc::from_raw_in(ptr, System);
    assert_eq!(2, Rc::strong_count(&five));
    Rc::decrement_strong_count_in(ptr, System);
    assert_eq!(1, Rc::strong_count(&five));
}

pub fn get_mut(this: &mut Rc<T, A>) -> Option<&mut T>

Returns a mutable reference into the given Rc, if there are no other Rc or Weak pointers to the same allocation.

Returns None otherwise, because it is not safe to mutate a shared value.

See also make_mut, which will clone the inner value when there are other Rc pointers.

Examples

use std::rc::Rc;

let mut x = Rc::new(3);
*Rc::get_mut(&mut x).unwrap() = 4;
assert_eq!(*x, 4);

let _y = Rc::clone(&x);
assert!(Rc::get_mut(&mut x).is_none());

pub unsafe fn get_mut_unchecked(this: &mut Rc<T, A>) -> &mut T

🔬This is a nightly-only experimental API. (get_mut_unchecked)

Returns a mutable reference into the given Rc, without any check.

See also get_mut, which is safe and does appropriate checks.

Safety

If any other Rc or Weak pointers to the same allocation exist, then they must not be dereferenced or have active borrows for the duration of the returned borrow, and their inner type must be exactly the same as the inner type of this Rc (including lifetimes). This is trivially the case if no such pointers exist, for example immediately after Rc::new.

Examples

#![feature(get_mut_unchecked)]

use std::rc::Rc;

let mut x = Rc::new(String::new());
unsafe {
    Rc::get_mut_unchecked(&mut x).push_str("foo")
}
assert_eq!(*x, "foo");

Other Rc pointers to the same allocation must be to the same type.

#![feature(get_mut_unchecked)]

use std::rc::Rc;

let x: Rc<str> = Rc::from("Hello, world!");
let mut y: Rc<[u8]> = x.clone().into();
unsafe {
    // this is Undefined Behavior, because x's inner type is str, not [u8]
    Rc::get_mut_unchecked(&mut y).fill(0xff); // 0xff is invalid in UTF-8
}
println!("{}", &*x); // Invalid UTF-8 in a str

Other Rc pointers to the same allocation must be to the exact same type, including lifetimes.

#![feature(get_mut_unchecked)]

use std::rc::Rc;

let x: Rc<&str> = Rc::new("Hello, world!");
{
    let s = String::from("Oh, no!");
    let mut y: Rc<&str> = x.clone();
    unsafe {
        // this is Undefined Behavior, because x's inner type
        // is &'long str, not &'short str
        *Rc::get_mut_unchecked(&mut y) = &s;
    }
}
println!("{}", &*x); // Use-after-free

pub fn ptr_eq(this: &Rc<T, A>, other: &Rc<T, A>) -> bool

Returns true if the two Rcs point to the same allocation in a vein similar to ptr::eq. This function ignores the metadata of dyn Trait pointers.

Examples

use std::rc::Rc;

let five = Rc::new(5);
let same_five = Rc::clone(&five);
let other_five = Rc::new(5);

assert!(Rc::ptr_eq(&five, &same_five));
assert!(!Rc::ptr_eq(&five, &other_five));

impl<T, A> Rc<T, A>

where T: CloneToUninit + ?Sized, A: Allocator + Clone,

pub fn make_mut(this: &mut Rc<T, A>) -> &mut T

Makes a mutable reference into the given Rc.

If there are other Rc pointers to the same allocation, then make_mut will clone the inner value to a new allocation to ensure unique ownership. This is also referred to as clone-on-write.

However, if there are no other Rc pointers to this allocation, but some Weak pointers, then the Weak pointers will be disassociated and the inner value will not be cloned.

See also get_mut, which will fail rather than cloning the inner value or disassociating Weak pointers.

Examples

use std::rc::Rc;

let mut data = Rc::new(5);

*Rc::make_mut(&mut data) += 1;         // Won't clone anything
let mut other_data = Rc::clone(&data); // Won't clone inner data
*Rc::make_mut(&mut data) += 1;         // Clones inner data
*Rc::make_mut(&mut data) += 1;         // Won't clone anything
*Rc::make_mut(&mut other_data) *= 2;   // Won't clone anything

// Now `data` and `other_data` point to different allocations.
assert_eq!(*data, 8);
assert_eq!(*other_data, 12);

Weak pointers will be disassociated:

use std::rc::Rc;

let mut data = Rc::new(75);
let weak = Rc::downgrade(&data);

assert!(75 == *data);
assert!(75 == *weak.upgrade().unwrap());

*Rc::make_mut(&mut data) += 1;

assert!(76 == *data);
assert!(weak.upgrade().is_none());

impl<T, A> Rc<T, A>

where T: Clone, A: Allocator,

pub fn unwrap_or_clone(this: Rc<T, A>) -> T

If we have the only reference to T then unwrap it. Otherwise, clone T and return the clone.

Assuming rc_t is of type Rc<T>, this function is functionally equivalent to (*rc_t).clone(), but will avoid cloning the inner value where possible.

Examples

let inner = String::from("test");
let ptr = inner.as_ptr();

let rc = Rc::new(inner);
let inner = Rc::unwrap_or_clone(rc);
// The inner value was not cloned
assert!(ptr::eq(ptr, inner.as_ptr()));

let rc = Rc::new(inner);
let rc2 = rc.clone();
let inner = Rc::unwrap_or_clone(rc);
// Because there were 2 references, we had to clone the inner value.
assert!(!ptr::eq(ptr, inner.as_ptr()));
// `rc2` is the last reference, so when we unwrap it we get back
// the original `String`.
let inner = Rc::unwrap_or_clone(rc2);
assert!(ptr::eq(ptr, inner.as_ptr()));

impl<A> Rc<dyn Any, A>

where A: Allocator,

pub fn downcast<T>(self) -> Result<Rc<T, A>, Rc<dyn Any, A>>

where T: Any,

Attempts to downcast the Rc<dyn Any> to a concrete type.

Examples

use std::any::Any;
use std::rc::Rc;

fn print_if_string(value: Rc<dyn Any>) {
    if let Ok(string) = value.downcast::<String>() {
        println!("String ({}): {}", string.len(), string);
    }
}

let my_string = "Hello World".to_string();
print_if_string(Rc::new(my_string));
print_if_string(Rc::new(0i8));

pub unsafe fn downcast_unchecked<T>(self) -> Rc<T, A>

where T: Any,

🔬This is a nightly-only experimental API. (downcast_unchecked)

Downcasts the Rc<dyn Any> to a concrete type.

For a safe alternative see downcast.

Examples

#![feature(downcast_unchecked)]

use std::any::Any;
use std::rc::Rc;

let x: Rc<dyn Any> = Rc::new(1_usize);

unsafe {
    assert_eq!(*x.downcast_unchecked::<usize>(), 1);
}

Safety

The contained value must be of type T. Calling this method with the incorrect type is undefined behavior.

Trait Implementations

impl<T, A> Allocator for Rc<T, A>

where T: Allocator + ?Sized, A: Allocator,

fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Attempts to allocate a block of memory.

fn allocate_zeroed(&self, layout: Layout) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Behaves like allocate, but also ensures that the returned memory is zero-initialized.

unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout)

🔬This is a nightly-only experimental API. (allocator_api)

Deallocates the memory referenced by ptr.

unsafe fn grow( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Attempts to extend the memory block.

unsafe fn grow_zeroed( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Behaves like grow, but also ensures that the new contents are set to zero before being returned.

unsafe fn shrink( &self, ptr: NonNull<u8>, old_layout: Layout, new_layout: Layout, ) -> Result<NonNull<[u8]>, AllocError>

🔬This is a nightly-only experimental API. (allocator_api)

Attempts to shrink the memory block.

fn by_ref(&self) -> &Self

where Self: Sized,

🔬This is a nightly-only experimental API. (allocator_api)

Creates a “by reference” adapter for this instance of Allocator.

impl<T> AsFd for Rc<T>

where T: AsFd + ?Sized,

fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

impl<T> AsRawFd for Rc<T>

where T: AsRawFd,

fn as_raw_fd(&self) -> i32

Extracts the raw file descriptor.

impl<T, A> AsRef<T> for Rc<T, A>

where A: Allocator, T: ?Sized,

fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.

impl<T, A> Borrow<T> for Rc<T, A>

where A: Allocator, T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value.

impl<T, A> Clone for Rc<T, A>

where A: Allocator + Clone, T: ?Sized,

fn clone(&self) -> Rc<T, A>

Makes a clone of the Rc pointer.

This creates another pointer to the same allocation, increasing the strong reference count.

Examples

use std::rc::Rc;

let five = Rc::new(5);

let _ = Rc::clone(&five);

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T, A> Debug for Rc<T, A>

where T: Debug + ?Sized, A: Allocator,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Default for Pin<Rc<T>>

where Rc<T>: Default, T: ?Sized,

Available on non-no_global_oom_handling only.

fn default() -> Pin<Rc<T>>

Returns the “default value” for a type.

impl<T> Default for Rc<[T]>

Available on non-no_global_oom_handling only.

fn default() -> Rc<[T]>

Creates an empty [T] inside an Rc.

This may or may not share an allocation with other Rcs on the same thread.

impl Default for Rc<CStr>

Available on non-no_global_oom_handling only.

fn default() -> Rc<CStr>

Creates an empty CStr inside an Rc

This may or may not share an allocation with other Rcs on the same thread.

impl<T> Default for Rc<T>

where T: Default,

Available on non-no_global_oom_handling only.

fn default() -> Rc<T>

Creates a new Rc<T>, with the Default value for T.

Examples

use std::rc::Rc;

let x: Rc<i32> = Default::default();
assert_eq!(*x, 0);

impl Default for Rc<str>

Available on non-no_global_oom_handling only.

fn default() -> Rc<str>

Creates an empty str inside an Rc.

This may or may not share an allocation with other Rcs on the same thread.

impl<T, A> Deref for Rc<T, A>

where A: Allocator, T: ?Sized,

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<'de, T, U> DeserializeAs<'de, Pin<Rc<T>>> for Pin<Rc<U>>

where U: DeserializeAs<'de, T>,

fn deserialize_as<D>( deserializer: D, ) -> Result<Pin<Rc<T>>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de, T, U> DeserializeAs<'de, Rc<T>> for Rc<U>

where U: DeserializeAs<'de, T>,

Available on crate feature alloc only.

fn deserialize_as<D>( deserializer: D, ) -> Result<Rc<T>, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T, A> Display for Rc<T, A>

where T: Display + ?Sized, A: Allocator,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T, A> Drop for Rc<T, A>

where A: Allocator, T: ?Sized,

fn drop(&mut self)

Drops the Rc.

This will decrement the strong reference count. If the strong reference count reaches zero then the only other references (if any) are Weak, so we drop the inner value.

Examples

use std::rc::Rc;

struct Foo;

impl Drop for Foo {
    fn drop(&mut self) {
        println!("dropped!");
    }
}

let foo  = Rc::new(Foo);
let foo2 = Rc::clone(&foo);

drop(foo);    // Doesn't print anything
drop(foo2);   // Prints "dropped!"

impl<T> From<&[T]> for Rc<[T]>

where T: Clone,

Available on non-no_global_oom_handling only.

fn from(v: &[T]) -> Rc<[T]>

Allocates a reference-counted slice and fills it by cloning v’s items.

Example

let original: &[i32] = &[1, 2, 3];
let shared: Rc<[i32]> = Rc::from(original);
assert_eq!(&[1, 2, 3], &shared[..]);

impl From<&CStr> for Rc<CStr>

fn from(s: &CStr) -> Rc<CStr>

Converts a &CStr into a Rc<CStr>, by copying the contents into a newly allocated Rc.

impl From<&OsStr> for Rc<OsStr>

fn from(s: &OsStr) -> Rc<OsStr>

Copies the string into a newly allocated Rc<OsStr>.

impl From<&Path> for Rc<Path>

fn from(s: &Path) -> Rc<Path>

Converts a Path into an Rc by copying the Path data into a new Rc buffer.

impl<T> From<&mut [T]> for Rc<[T]>

where T: Clone,

Available on non-no_global_oom_handling only.

fn from(v: &mut [T]) -> Rc<[T]>

Allocates a reference-counted slice and fills it by cloning v’s items.

Example

let mut original = [1, 2, 3];
let original: &mut [i32] = &mut original;
let shared: Rc<[i32]> = Rc::from(original);
assert_eq!(&[1, 2, 3], &shared[..]);

impl From<&mut CStr> for Rc<CStr>

fn from(s: &mut CStr) -> Rc<CStr>

Converts a &mut CStr into a Rc<CStr>, by copying the contents into a newly allocated Rc.

impl From<&mut OsStr> for Rc<OsStr>

fn from(s: &mut OsStr) -> Rc<OsStr>

Copies the string into a newly allocated Rc<OsStr>.

impl From<&mut Path> for Rc<Path>

fn from(s: &mut Path) -> Rc<Path>

Converts a Path into an Rc by copying the Path data into a new Rc buffer.

impl From<&mut str> for Rc<str>

Available on non-no_global_oom_handling only.

fn from(v: &mut str) -> Rc<str>

Allocates a reference-counted string slice and copies v into it.

Example

let mut original = String::from("statue");
let original: &mut str = &mut original;
let shared: Rc<str> = Rc::from(original);
assert_eq!("statue", &shared[..]);

impl From<&str> for Rc<str>

Available on non-no_global_oom_handling only.

fn from(v: &str) -> Rc<str>

Allocates a reference-counted string slice and copies v into it.

Example

let shared: Rc<str> = Rc::from("statue");
assert_eq!("statue", &shared[..]);

impl<T, const N: usize> From<[T; N]> for Rc<[T]>

Available on non-no_global_oom_handling only.

fn from(v: [T; N]) -> Rc<[T]>

Converts a [T; N] into an Rc<[T]>.

The conversion moves the array into a newly allocated Rc.

Example

let original: [i32; 3] = [1, 2, 3];
let shared: Rc<[i32]> = Rc::from(original);
assert_eq!(&[1, 2, 3], &shared[..]);

impl<T, A> From<Box<T, A>> for Rc<T, A>

where A: Allocator, T: ?Sized,

Available on non-no_global_oom_handling only.

fn from(v: Box<T, A>) -> Rc<T, A>

Move a boxed object to a new, reference counted, allocation.

Example

let original: Box<i32> = Box::new(1);
let shared: Rc<i32> = Rc::from(original);
assert_eq!(1, *shared);

impl From<CString> for Rc<CStr>

fn from(s: CString) -> Rc<CStr>

Converts a CString into an Rc<CStr> by moving the CString data into a new Rc buffer.

impl<'a, B> From<Cow<'a, B>> for Rc<B>

where B: ToOwned + ?Sized, Rc<B>: From<&'a B> + From<<B as ToOwned>::Owned>,

fn from(cow: Cow<'a, B>) -> Rc<B>

Creates a reference-counted pointer from a clone-on-write pointer by copying its content.

Example

let cow: Cow<'_, str> = Cow::Borrowed("eggplant");
let shared: Rc<str> = Rc::from(cow);
assert_eq!("eggplant", &shared[..]);

impl From<OsString> for Rc<OsStr>

fn from(s: OsString) -> Rc<OsStr>

Converts an OsString into an Rc<OsStr> by moving the OsString data into a new Rc buffer.

impl From<PathBuf> for Rc<Path>

fn from(s: PathBuf) -> Rc<Path>

Converts a PathBuf into an Rc<Path> by moving the PathBuf data into a new Rc buffer.

impl From<Rc<[u8]>> for Rc<ByteStr>

Available on non-no_rc only.

fn from(s: Rc<[u8]>) -> Rc<ByteStr>

Converts to this type from the input type.

impl From<Rc<ByteStr>> for Rc<[u8]>

Available on non-no_rc only.

fn from(s: Rc<ByteStr>) -> Rc<[u8]>

Converts to this type from the input type.

impl<W> From<Rc<W>> for LocalWaker

where W: LocalWake + 'static,

fn from(waker: Rc<W>) -> LocalWaker

Use a Wake-able type as a LocalWaker.

No heap allocations or atomic operations are used for this conversion.

impl<W> From<Rc<W>> for RawWaker

where W: LocalWake + 'static,

fn from(waker: Rc<W>) -> RawWaker

Use a Wake-able type as a RawWaker.

No heap allocations or atomic operations are used for this conversion.

impl From<Rc<str>> for Rc<[u8]>

fn from(rc: Rc<str>) -> Rc<[u8]>

Converts a reference-counted string slice into a byte slice.

Example

let string: Rc<str> = Rc::from("eggplant");
let bytes: Rc<[u8]> = Rc::from(string);
assert_eq!("eggplant".as_bytes(), bytes.as_ref());

impl From<String> for Rc<str>

Available on non-no_global_oom_handling only.

fn from(v: String) -> Rc<str>

Allocates a reference-counted string slice and copies v into it.

Example

let original: String = "statue".to_owned();
let shared: Rc<str> = Rc::from(original);
assert_eq!("statue", &shared[..]);

impl<T> From<T> for Rc<T>

Available on non-no_global_oom_handling only.

fn from(t: T) -> Rc<T>

Converts a generic type T into an Rc<T>

The conversion allocates on the heap and moves t from the stack into it.

Example

let x = 5;
let rc = Rc::new(5);

assert_eq!(Rc::from(x), rc);

impl<T, A> From<Vec<T, A>> for Rc<[T], A>

where A: Allocator,

Available on non-no_global_oom_handling only.

fn from(v: Vec<T, A>) -> Rc<[T], A>

Allocates a reference-counted slice and moves v’s items into it.

Example

let unique: Vec<i32> = vec![1, 2, 3];
let shared: Rc<[i32]> = Rc::from(unique);
assert_eq!(&[1, 2, 3], &shared[..]);

impl<T> FromIterator<T> for Rc<[T]>

Available on non-no_global_oom_handling only.

fn from_iter<I>(iter: I) -> Rc<[T]>

where I: IntoIterator<Item = T>,

Takes each element in the Iterator and collects it into an Rc<[T]>.

Performance characteristics

The general case

In the general case, collecting into Rc<[T]> is done by first collecting into a Vec<T>. That is, when writing the following:

let evens: Rc<[u8]> = (0..10).filter(|&x| x % 2 == 0).collect();

this behaves as if we wrote:

let evens: Rc<[u8]> = (0..10).filter(|&x| x % 2 == 0)
    .collect::<Vec<_>>() // The first set of allocations happens here.
    .into(); // A second allocation for `Rc<[T]>` happens here.

This will allocate as many times as needed for constructing the Vec<T> and then it will allocate once for turning the Vec<T> into the Rc<[T]>.

Iterators of known length

When your Iterator implements TrustedLen and is of an exact size, a single allocation will be made for the Rc<[T]>. For example:

let evens: Rc<[u8]> = (0..10).collect(); // Just a single allocation happens here.

impl<T, A> Hash for Rc<T, A>

where T: Hash + ?Sized, A: Allocator,

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> JsonSchema for Rc<T>

where T: JsonSchema + ?Sized,

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

impl<T, TA> JsonSchemaAs<Rc<T>> for Rc<TA>

where TA: JsonSchemaAs<T>, T: ?Sized,

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(gen: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON schemas generated for this type should be included directly in arent schemas, rather than being re-used where possible using the $ref keyword.

impl<T> LanguageServer for Rc<T>

where T: LanguageServer + ?Sized, Rc<T>: 'static,

fn initialize<'life0, 'async_trait>( &'life0 self, params: InitializeParams, ) -> Pin<Box<dyn Future<Output = Result<InitializeResult, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The initialize request is the first request sent from the client to the server.

fn initialized<'life0, 'async_trait>( &'life0 self, params: InitializedParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The initialized notification is sent from the client to the server after the client received the result of the initialize request but before the client sends anything else.

fn shutdown<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The shutdown request asks the server to gracefully shut down, but to not exit.

fn did_open<'life0, 'async_trait>( &'life0 self, params: DidOpenTextDocumentParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/didOpen notification is sent from the client to the server to signal that a new text document has been opened by the client.

fn did_change<'life0, 'async_trait>( &'life0 self, params: DidChangeTextDocumentParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/didChange notification is sent from the client to the server to signal changes to a text document.

fn will_save<'life0, 'async_trait>( &'life0 self, params: WillSaveTextDocumentParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/willSave notification is sent from the client to the server before the document is actually saved.

fn will_save_wait_until<'life0, 'async_trait>( &'life0 self, params: WillSaveTextDocumentParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<TextEdit>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/willSaveWaitUntil request is sent from the client to the server before the document is actually saved.

fn did_save<'life0, 'async_trait>( &'life0 self, params: DidSaveTextDocumentParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/didSave notification is sent from the client to the server when the document was saved in the client.

fn did_close<'life0, 'async_trait>( &'life0 self, params: DidCloseTextDocumentParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/didClose notification is sent from the client to the server when the document got closed in the client.

fn goto_declaration<'life0, 'async_trait>( &'life0 self, params: GotoDefinitionParams, ) -> Pin<Box<dyn Future<Output = Result<Option<GotoDefinitionResponse>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/declaration request asks the server for the declaration location of a symbol at a given text document position.

fn goto_definition<'life0, 'async_trait>( &'life0 self, params: GotoDefinitionParams, ) -> Pin<Box<dyn Future<Output = Result<Option<GotoDefinitionResponse>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/definition request asks the server for the definition location of a symbol at a given text document position.

fn goto_type_definition<'life0, 'async_trait>( &'life0 self, params: GotoDefinitionParams, ) -> Pin<Box<dyn Future<Output = Result<Option<GotoDefinitionResponse>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/typeDefinition request asks the server for the type definition location of a symbol at a given text document position.

fn goto_implementation<'life0, 'async_trait>( &'life0 self, params: GotoDefinitionParams, ) -> Pin<Box<dyn Future<Output = Result<Option<GotoDefinitionResponse>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/implementation request is sent from the client to the server to resolve the implementation location of a symbol at a given text document position.

fn references<'life0, 'async_trait>( &'life0 self, params: ReferenceParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<Location>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/references request is sent from the client to the server to resolve project-wide references for the symbol denoted by the given text document position.

fn prepare_call_hierarchy<'life0, 'async_trait>( &'life0 self, params: CallHierarchyPrepareParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<CallHierarchyItem>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/prepareCallHierarchy request is sent from the client to the server to return a call hierarchy for the language element of given text document positions.

fn incoming_calls<'life0, 'async_trait>( &'life0 self, params: CallHierarchyIncomingCallsParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<CallHierarchyIncomingCall>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The callHierarchy/incomingCalls request is sent from the client to the server to resolve incoming calls for a given call hierarchy item.

fn outgoing_calls<'life0, 'async_trait>( &'life0 self, params: CallHierarchyOutgoingCallsParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<CallHierarchyOutgoingCall>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The callHierarchy/outgoingCalls request is sent from the client to the server to resolve outgoing calls for a given call hierarchy item.

fn prepare_type_hierarchy<'life0, 'async_trait>( &'life0 self, params: TypeHierarchyPrepareParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<TypeHierarchyItem>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/prepareTypeHierarchy request is sent from the client to the server to return a type hierarchy for the language element of given text document positions.

fn supertypes<'life0, 'async_trait>( &'life0 self, params: TypeHierarchySupertypesParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<TypeHierarchyItem>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The [typeHierarchy/supertypes] request is sent from the client to the server to resolve the supertypes for a given type hierarchy item.

fn subtypes<'life0, 'async_trait>( &'life0 self, params: TypeHierarchySubtypesParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<TypeHierarchyItem>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The [typeHierarchy/subtypes] request is sent from the client to the server to resolve the subtypes for a given type hierarchy item.

fn document_highlight<'life0, 'async_trait>( &'life0 self, params: DocumentHighlightParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<DocumentHighlight>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/documentHighlight request is sent from the client to the server to resolve appropriate highlights for a given text document position.

fn document_link<'life0, 'async_trait>( &'life0 self, params: DocumentLinkParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<DocumentLink>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/documentLink request is sent from the client to the server to request the location of links in a document.

fn document_link_resolve<'life0, 'async_trait>( &'life0 self, params: DocumentLink, ) -> Pin<Box<dyn Future<Output = Result<DocumentLink, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The documentLink/resolve request is sent from the client to the server to resolve the target of a given document link.

fn hover<'life0, 'async_trait>( &'life0 self, params: HoverParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Hover>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/hover request asks the server for hover information at a given text document position.

fn code_lens<'life0, 'async_trait>( &'life0 self, params: CodeLensParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<CodeLens>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/codeLens request is sent from the client to the server to compute code lenses for a given text document.

fn code_lens_resolve<'life0, 'async_trait>( &'life0 self, params: CodeLens, ) -> Pin<Box<dyn Future<Output = Result<CodeLens, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The codeLens/resolve request is sent from the client to the server to resolve the command for a given code lens item.

fn folding_range<'life0, 'async_trait>( &'life0 self, params: FoldingRangeParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<FoldingRange>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/foldingRange request is sent from the client to the server to return all folding ranges found in a given text document.

fn selection_range<'life0, 'async_trait>( &'life0 self, params: SelectionRangeParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<SelectionRange>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/selectionRange request is sent from the client to the server to return suggested selection ranges at an array of given positions. A selection range is a range around the cursor position which the user might be interested in selecting.

fn document_symbol<'life0, 'async_trait>( &'life0 self, params: DocumentSymbolParams, ) -> Pin<Box<dyn Future<Output = Result<Option<DocumentSymbolResponse>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/documentSymbol request is sent from the client to the server to retrieve all symbols found in a given text document.

fn semantic_tokens_full<'life0, 'async_trait>( &'life0 self, params: SemanticTokensParams, ) -> Pin<Box<dyn Future<Output = Result<Option<SemanticTokensResult>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/semanticTokens/full request is sent from the client to the server to resolve the semantic tokens of a given file.

fn semantic_tokens_full_delta<'life0, 'async_trait>( &'life0 self, params: SemanticTokensDeltaParams, ) -> Pin<Box<dyn Future<Output = Result<Option<SemanticTokensFullDeltaResult>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/semanticTokens/full/delta request is sent from the client to the server to resolve the semantic tokens of a given file, returning only the delta.

fn semantic_tokens_range<'life0, 'async_trait>( &'life0 self, params: SemanticTokensRangeParams, ) -> Pin<Box<dyn Future<Output = Result<Option<SemanticTokensRangeResult>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/semanticTokens/range request is sent from the client to the server to resolve the semantic tokens for the visible range of a given file.

fn inline_value<'life0, 'async_trait>( &'life0 self, params: InlineValueParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<InlineValue>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/inlineValue request is sent from the client to the server to compute inline values for a given text document that may be rendered in the editor at the end of lines.

fn inlay_hint<'life0, 'async_trait>( &'life0 self, params: InlayHintParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<InlayHint>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/inlayHint request is sent from the client to the server to compute inlay hints for a given (text document, range) tuple that may be rendered in the editor in place with other text.

fn inlay_hint_resolve<'life0, 'async_trait>( &'life0 self, params: InlayHint, ) -> Pin<Box<dyn Future<Output = Result<InlayHint, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The inlayHint/resolve request is sent from the client to the server to resolve additional information for a given inlay hint.

fn moniker<'life0, 'async_trait>( &'life0 self, params: MonikerParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<Moniker>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/moniker request is sent from the client to the server to get the symbol monikers for a given text document position.

fn completion<'life0, 'async_trait>( &'life0 self, params: CompletionParams, ) -> Pin<Box<dyn Future<Output = Result<Option<CompletionResponse>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/completion request is sent from the client to the server to compute completion items at a given cursor position.

fn completion_resolve<'life0, 'async_trait>( &'life0 self, params: CompletionItem, ) -> Pin<Box<dyn Future<Output = Result<CompletionItem, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The completionItem/resolve request is sent from the client to the server to resolve additional information for a given completion item.

fn diagnostic<'life0, 'async_trait>( &'life0 self, params: DocumentDiagnosticParams, ) -> Pin<Box<dyn Future<Output = Result<DocumentDiagnosticReportResult, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/diagnostic request is sent from the client to the server to ask the server to compute the diagnostics for a given document.

fn workspace_diagnostic<'life0, 'async_trait>( &'life0 self, params: WorkspaceDiagnosticParams, ) -> Pin<Box<dyn Future<Output = Result<WorkspaceDiagnosticReportResult, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/diagnostic request is sent from the client to the server to ask the server to compute workspace wide diagnostics which previously where pushed from the server to the client.

fn signature_help<'life0, 'async_trait>( &'life0 self, params: SignatureHelpParams, ) -> Pin<Box<dyn Future<Output = Result<Option<SignatureHelp>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/signatureHelp request is sent from the client to the server to request signature information at a given cursor position.

fn code_action<'life0, 'async_trait>( &'life0 self, params: CodeActionParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<CodeActionOrCommand>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/codeAction request is sent from the client to the server to compute commands for a given text document and range. These commands are typically code fixes to either fix problems or to beautify/refactor code.

fn code_action_resolve<'life0, 'async_trait>( &'life0 self, params: CodeAction, ) -> Pin<Box<dyn Future<Output = Result<CodeAction, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The codeAction/resolve request is sent from the client to the server to resolve additional information for a given code action.

fn document_color<'life0, 'async_trait>( &'life0 self, params: DocumentColorParams, ) -> Pin<Box<dyn Future<Output = Result<Vec<ColorInformation>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/documentColor request is sent from the client to the server to list all color references found in a given text document. Along with the range, a color value in RGB is returned.

fn color_presentation<'life0, 'async_trait>( &'life0 self, params: ColorPresentationParams, ) -> Pin<Box<dyn Future<Output = Result<Vec<ColorPresentation>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/colorPresentation request is sent from the client to the server to obtain a list of presentations for a color value at a given location.

fn formatting<'life0, 'async_trait>( &'life0 self, params: DocumentFormattingParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<TextEdit>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/formatting request is sent from the client to the server to format a whole document.

fn range_formatting<'life0, 'async_trait>( &'life0 self, params: DocumentRangeFormattingParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<TextEdit>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/rangeFormatting request is sent from the client to the server to format a given range in a document.

fn on_type_formatting<'life0, 'async_trait>( &'life0 self, params: DocumentOnTypeFormattingParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<TextEdit>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/onTypeFormatting request is sent from the client to the server to format parts of the document during typing.

fn rename<'life0, 'async_trait>( &'life0 self, params: RenameParams, ) -> Pin<Box<dyn Future<Output = Result<Option<WorkspaceEdit>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/rename request is sent from the client to the server to ask the server to compute a workspace change so that the client can perform a workspace-wide rename of a symbol.

fn prepare_rename<'life0, 'async_trait>( &'life0 self, params: TextDocumentPositionParams, ) -> Pin<Box<dyn Future<Output = Result<Option<PrepareRenameResponse>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/prepareRename request is sent from the client to the server to setup and test the validity of a rename operation at a given location.

fn linked_editing_range<'life0, 'async_trait>( &'life0 self, params: LinkedEditingRangeParams, ) -> Pin<Box<dyn Future<Output = Result<Option<LinkedEditingRanges>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The textDocument/linkedEditingRange request is sent from the client to the server to return for a given position in a document the range of the symbol at the position and all ranges that have the same content.

fn symbol<'life0, 'async_trait>( &'life0 self, params: WorkspaceSymbolParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Vec<SymbolInformation>>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/symbol request is sent from the client to the server to list project-wide symbols matching the given query string.

fn symbol_resolve<'life0, 'async_trait>( &'life0 self, params: WorkspaceSymbol, ) -> Pin<Box<dyn Future<Output = Result<WorkspaceSymbol, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspaceSymbol/resolve request is sent from the client to the server to resolve additional information for a given workspace symbol.

fn did_change_configuration<'life0, 'async_trait>( &'life0 self, params: DidChangeConfigurationParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/didChangeConfiguration notification is sent from the client to the server to signal the change of configuration settings.

fn did_change_workspace_folders<'life0, 'async_trait>( &'life0 self, params: DidChangeWorkspaceFoldersParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/didChangeWorkspaceFolders notification is sent from the client to the server to inform about workspace folder configuration changes.

fn will_create_files<'life0, 'async_trait>( &'life0 self, params: CreateFilesParams, ) -> Pin<Box<dyn Future<Output = Result<Option<WorkspaceEdit>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/willCreateFiles request is sent from the client to the server before files are actually created as long as the creation is triggered from within the client.

fn did_create_files<'life0, 'async_trait>( &'life0 self, params: CreateFilesParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/didCreateFiles request is sent from the client to the server when files were created from within the client.

fn will_rename_files<'life0, 'async_trait>( &'life0 self, params: RenameFilesParams, ) -> Pin<Box<dyn Future<Output = Result<Option<WorkspaceEdit>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/willRenameFiles request is sent from the client to the server before files are actually renamed as long as the rename is triggered from within the client.

fn did_rename_files<'life0, 'async_trait>( &'life0 self, params: RenameFilesParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/didRenameFiles notification is sent from the client to the server when files were renamed from within the client.

fn will_delete_files<'life0, 'async_trait>( &'life0 self, params: DeleteFilesParams, ) -> Pin<Box<dyn Future<Output = Result<Option<WorkspaceEdit>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/willDeleteFiles request is sent from the client to the server before files are actually deleted as long as the deletion is triggered from within the client either by a user action or by applying a workspace edit.

fn did_delete_files<'life0, 'async_trait>( &'life0 self, params: DeleteFilesParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/didDeleteFiles notification is sent from the client to the server when files were deleted from within the client.

fn did_change_watched_files<'life0, 'async_trait>( &'life0 self, params: DidChangeWatchedFilesParams, ) -> Pin<Box<dyn Future<Output = ()> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/didChangeWatchedFiles notification is sent from the client to the server when the client detects changes to files watched by the language client.

fn execute_command<'life0, 'async_trait>( &'life0 self, params: ExecuteCommandParams, ) -> Pin<Box<dyn Future<Output = Result<Option<Value>, Error>> + 'async_trait>>

where 'life0: 'async_trait, Rc<T>: 'async_trait,

The workspace/executeCommand request is sent from the client to the server to trigger command execution on the server.

impl<Sp> LocalSpawn for Rc<Sp>

where Sp: LocalSpawn + ?Sized,

fn spawn_local_obj( &self, future: LocalFutureObj<'static, ()>, ) -> Result<(), SpawnError>

Spawns a future that will be run to completion.

fn status_local(&self) -> Result<(), SpawnError>

Determines whether the executor is able to spawn new tasks.

impl<T, A> Ord for Rc<T, A>

where T: Ord + ?Sized, A: Allocator,

fn cmp(&self, other: &Rc<T, A>) -> Ordering

Comparison for two Rcs.

The two are compared by calling cmp() on their inner values.

Examples

use std::rc::Rc;
use std::cmp::Ordering;

let five = Rc::new(5);

assert_eq!(Ordering::Less, five.cmp(&Rc::new(6)));

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl<T, A> PartialEq for Rc<T, A>

where T: PartialEq + ?Sized, A: Allocator,

fn eq(&self, other: &Rc<T, A>) -> bool

Equality for two Rcs.

Two Rcs are equal if their inner values are equal, even if they are stored in different allocation.

If T also implements Eq (implying reflexivity of equality), two Rcs that point to the same allocation are always equal.

Examples

use std::rc::Rc;

let five = Rc::new(5);

assert!(five == Rc::new(5));

fn ne(&self, other: &Rc<T, A>) -> bool

Inequality for two Rcs.

Two Rcs are not equal if their inner values are not equal.

If T also implements Eq (implying reflexivity of equality), two Rcs that point to the same allocation are always equal.

Examples

use std::rc::Rc;

let five = Rc::new(5);

assert!(five != Rc::new(6));

impl<T, A> PartialOrd for Rc<T, A>

where T: PartialOrd + ?Sized, A: Allocator,

fn partial_cmp(&self, other: &Rc<T, A>) -> Option<Ordering>

Partial comparison for two Rcs.

The two are compared by calling partial_cmp() on their inner values.

Examples

use std::rc::Rc;
use std::cmp::Ordering;

let five = Rc::new(5);

assert_eq!(Some(Ordering::Less), five.partial_cmp(&Rc::new(6)));

fn lt(&self, other: &Rc<T, A>) -> bool

Less-than comparison for two Rcs.

The two are compared by calling < on their inner values.

Examples

use std::rc::Rc;

let five = Rc::new(5);

assert!(five < Rc::new(6));

fn le(&self, other: &Rc<T, A>) -> bool

‘Less than or equal to’ comparison for two Rcs.

The two are compared by calling <= on their inner values.

Examples

use std::rc::Rc;

let five = Rc::new(5);

assert!(five <= Rc::new(5));

fn gt(&self, other: &Rc<T, A>) -> bool

Greater-than comparison for two Rcs.

The two are compared by calling > on their inner values.

Examples

use std::rc::Rc;

let five = Rc::new(5);

assert!(five > Rc::new(4));

fn ge(&self, other: &Rc<T, A>) -> bool

‘Greater than or equal to’ comparison for two Rcs.

The two are compared by calling >= on their inner values.

Examples

use std::rc::Rc;

let five = Rc::new(5);

assert!(five >= Rc::new(5));

impl<T, A> Pointer for Rc<T, A>

where A: Allocator, T: ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> RefCnt for Pin<Rc<T>>

type Base = T

The base type the pointer points to.

fn into_ptr(me: Pin<Rc<T>>) -> *mut T

Converts the smart pointer into a raw pointer, without affecting the reference count.

fn as_ptr(me: &Pin<Rc<T>>) -> *mut T

Provides a view into the smart pointer as a raw pointer.

unsafe fn from_ptr(ptr: *const T) -> Pin<Rc<T>>

Converts a raw pointer back into the smart pointer, without affecting the reference count.

fn inc(me: &Self) -> *mut Self::Base

Increments the reference count by one.

unsafe fn dec(ptr: *const Self::Base)

Decrements the reference count by one.

impl<T> RefCnt for Rc<T>

type Base = T

The base type the pointer points to.

fn into_ptr(me: Rc<T>) -> *mut T

Converts the smart pointer into a raw pointer, without affecting the reference count.

fn as_ptr(me: &Rc<T>) -> *mut T

Provides a view into the smart pointer as a raw pointer.

unsafe fn from_ptr(ptr: *const T) -> Rc<T>

Converts a raw pointer back into the smart pointer, without affecting the reference count.

fn inc(me: &Self) -> *mut Self::Base

Increments the reference count by one.

unsafe fn dec(ptr: *const Self::Base)

Decrements the reference count by one.

impl<T, U> SerializeAs<Pin<Rc<T>>> for Pin<Rc<U>>

where U: SerializeAs<T>,

fn serialize_as<S>( source: &Pin<Rc<T>>, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<T, U> SerializeAs<Rc<T>> for Rc<U>

where U: SerializeAs<T>,

Available on crate feature alloc only.

fn serialize_as<S>( source: &Rc<T>, serializer: S, ) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<Request, S> Service<Request> for Rc<S>

where S: Service<Request> + ?Sized,

type Response = <S as Service<Request>>::Response

Responses given by the service.

type Error = <S as Service<Request>>::Error

Errors produced by the service.

type Future = <S as Service<Request>>::Future

The future response value.

fn call(&self, req: Request) -> <Rc<S> as Service<Request>>::Future

Process the request and return the response asynchronously. call takes &self instead of mut &self because:

impl<Sp> Spawn for Rc<Sp>

where Sp: Spawn + ?Sized,

fn spawn_obj(&self, future: FutureObj<'static, ()>) -> Result<(), SpawnError>

Spawns a future that will be run to completion.

fn status(&self) -> Result<(), SpawnError>

Determines whether the executor is able to spawn new tasks.

impl<T, A, const N: usize> TryFrom<Rc<[T], A>> for Rc<[T; N], A>

where A: Allocator,

type Error = Rc<[T], A>

The type returned in the event of a conversion error.

fn try_from( boxed_slice: Rc<[T], A>, ) -> Result<Rc<[T; N], A>, <Rc<[T; N], A> as TryFrom<Rc<[T], A>>>::Error>

Performs the conversion.

impl<T> CloneFromCell for Rc<T>

where T: ?Sized,

impl<T, U, A> CoerceUnsized<Rc<U, A>> for Rc<T, A>

where T: Unsize<U> + ?Sized, A: Allocator, U: ?Sized,

impl<T, A> DerefPure for Rc<T, A>

where A: Allocator, T: ?Sized,

impl<T, U> DispatchFromDyn<Rc<U>> for Rc<T>

where T: Unsize<U> + ?Sized, U: ?Sized,

impl<T, A> Eq for Rc<T, A>

where T: Eq + ?Sized, A: Allocator,

impl<T, A> PinCoerceUnsized for Rc<T, A>

where A: Allocator, T: ?Sized,

impl<T, A> RefUnwindSafe for Rc<T, A>

where T: RefUnwindSafe + ?Sized, A: Allocator + UnwindSafe,

impl<T, A> !Send for Rc<T, A>

where A: Allocator, T: ?Sized,

impl<T, A> !Sync for Rc<T, A>

where A: Allocator, T: ?Sized,

impl<T, A> Unpin for Rc<T, A>

where A: Allocator, T: ?Sized,

impl<T, A> UnwindSafe for Rc<T, A>

where T: RefUnwindSafe + ?Sized, A: Allocator + UnwindSafe,

impl<T, A> UseCloned for Rc<T, A>

where A: Allocator + Clone, T: ?Sized,