Struct alloc::arc::ArcStable
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pub struct Arc<T> {
// some fields omitted
}An atomically reference counted wrapper for shared state.
Example
In this example, a large vector of floats is shared between several tasks.
With simple pipes, without Arc, a copy would have to be made for each
task.
use std::sync::Arc; use std::thread; fn main() { let numbers: Vec<_> = (0..100u32).map(|i| i as f32).collect(); let shared_numbers = Arc::new(numbers); for _ in 0..10 { let child_numbers = shared_numbers.clone(); thread::spawn(move || { let local_numbers = child_numbers.as_slice(); // Work with the local numbers }); } }
Methods
impl<T> Arc<T>
fn new(data: T) -> Arc<T>
fn downgrade(&self) -> Weak<T>
Downgrades the Arc<T> to a Weak<T> reference.
Examples
use std::sync::Arc; let five = Arc::new(5); let weak_five = five.downgrade();
impl<T: Send + Sync + Clone> Arc<T>
fn make_unique(&mut self) -> &mut T
Make a mutable reference from the given Arc<T>.
This is also referred to as a copy-on-write operation because the inner data is cloned if the reference count is greater than one.
Examples
use std::sync::Arc; let mut five = Arc::new(5); let mut_five = five.make_unique();
Trait Implementations
impl<T: Sync + Send> Send for Arc<T>
impl<T: Sync + Send> Sync for Arc<T>
impl<T> Clone for Arc<T>
fn clone(&self) -> Arc<T>
Makes a clone of the Arc<T>.
This increases the strong reference count.
Examples
use std::sync::Arc; let five = Arc::new(5); five.clone();
fn clone_from(&mut self, source: &Self)
impl<T> Deref for Arc<T>
type Target = T
fn deref(&self) -> &T
impl<T: Sync + Send> Drop for Arc<T>
fn drop(&mut self)
Drops the Arc<T>.
This will decrement the strong reference count. If the strong reference count becomes zero
and the only other references are Weak<T> ones, drops the inner value.
Examples
use std::sync::Arc; { let five = Arc::new(5); // stuff drop(five); // explicit drop } { let five = Arc::new(5); // stuff } // implicit drop
impl<T: PartialEq> PartialEq for Arc<T>
fn eq(&self, other: &Arc<T>) -> bool
Equality for two Arc<T>s.
Two Arc<T>s are equal if their inner value are equal.
Examples
use std::sync::Arc; let five = Arc::new(5); five == Arc::new(5);
fn ne(&self, other: &Arc<T>) -> bool
Inequality for two Arc<T>s.
Two Arc<T>s are unequal if their inner value are unequal.
Examples
use std::sync::Arc; let five = Arc::new(5); five != Arc::new(5);
impl<T: PartialOrd> PartialOrd for Arc<T>
fn partial_cmp(&self, other: &Arc<T>) -> Option<Ordering>
Partial comparison for two Arc<T>s.
The two are compared by calling partial_cmp() on their inner values.
Examples
use std::sync::Arc; let five = Arc::new(5); five.partial_cmp(&Arc::new(5));
fn lt(&self, other: &Arc<T>) -> bool
Less-than comparison for two Arc<T>s.
The two are compared by calling < on their inner values.
Examples
use std::sync::Arc; let five = Arc::new(5); five < Arc::new(5);
fn le(&self, other: &Arc<T>) -> bool
'Less-than or equal to' comparison for two Arc<T>s.
The two are compared by calling <= on their inner values.
Examples
use std::sync::Arc; let five = Arc::new(5); five <= Arc::new(5);
fn gt(&self, other: &Arc<T>) -> bool
Greater-than comparison for two Arc<T>s.
The two are compared by calling > on their inner values.
Examples
use std::sync::Arc; let five = Arc::new(5); five > Arc::new(5);
fn ge(&self, other: &Arc<T>) -> bool
'Greater-than or equal to' comparison for two Arc<T>s.
The two are compared by calling >= on their inner values.
Examples
use std::sync::Arc; let five = Arc::new(5); five >= Arc::new(5);