Struct std::cell::Ref1.0.0 [] [src]

pub struct Ref<'b, T> where
    T: 'b + ?Sized
{ /* fields omitted */ }

Wraps a borrowed reference to a value in a RefCell box. A wrapper type for an immutably borrowed value from a RefCell<T>.

See the module-level documentation for more.

Methods

impl<'b, T> Ref<'b, T> where
    T: ?Sized
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1.15.0
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Copies a Ref.

The RefCell is already immutably borrowed, so this cannot fail.

This is an associated function that needs to be used as Ref::clone(...). A Clone implementation or a method would interfere with the widespread use of r.borrow().clone() to clone the contents of a RefCell.

1.8.0
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Make a new Ref for a component of the borrowed data.

The RefCell is already immutably borrowed, so this cannot fail.

This is an associated function that needs to be used as Ref::map(...). A method would interfere with methods of the same name on the contents of a RefCell used through Deref.

Examples

use std::cell::{RefCell, Ref};

let c = RefCell::new((5, 'b'));
let b1: Ref<(u32, char)> = c.borrow();
let b2: Ref<u32> = Ref::map(b1, |t| &t.0);
assert_eq!(*b2, 5)Run

Trait Implementations

impl<'b, T> Deref for Ref<'b, T> where
    T: ?Sized
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The resulting type after dereferencing.

Important traits for &'a mut I
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Dereferences the value.

impl<'a, T> Display for Ref<'a, T> where
    T: Display + ?Sized
1.20.0
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Formats the value using the given formatter. Read more

impl<'b, T, U> CoerceUnsized<Ref<'b, U>> for Ref<'b, T> where
    T: Unsize<U> + ?Sized,
    U: ?Sized
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impl<'b, T> Debug for Ref<'b, T> where
    T: Debug + ?Sized
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Formats the value using the given formatter. Read more