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This commit is contained in:
Tymoteusz Jankowski 2017-07-24 21:45:21 +02:00
parent 8286075346
commit beb072a893

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@ -187,9 +187,12 @@ use ops::{Deref, DerefMut, CoerceUnsized};
use ptr;
/// A mutable memory location.
///
/// # Examples
///
/// Here you can see how using `Cell<T>` allows to use mutable field inside
/// immutable struct (which is also called 'interior mutability').
///
/// ```
/// use std::cell::Cell;
///
@ -204,8 +207,10 @@ use ptr;
/// };
///
/// let new_value = 100;
///
/// // ERROR, because my_struct is immutable
/// // immutable.regular_field = new_value;
///
/// // WORKS, although `my_struct` is immutable, field `special_field` is mutable because it is Cell
/// immutable.special_field.set(new_value);
/// assert_eq!(immutable.special_field.get(), new_value);