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Make Arc cloning mechanics clearer in module docs #53782

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merged 3 commits into from
Sep 1, 2018
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Make Arc cloning mechanics clearer in module docs #53782

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5399616
Make Arc cloning mechanics clearer in module docs
rask Aug 29, 2018
6020219
Rephrase Arc documentation changes regarding clones
rask Aug 30, 2018
bf7e324
Add clearer wording to Arc clone example code
rask Aug 31, 2018
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9 changes: 5 additions & 4 deletions src/liballoc/sync.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -49,9 +49,10 @@ const MAX_REFCOUNT: usize = (isize::MAX) as usize;
///
/// The type `Arc<T>` provides shared ownership of a value of type `T`,
/// allocated in the heap. Invoking [`clone`][clone] on `Arc` produces
/// a new pointer to the same value in the heap. When the last `Arc`
/// pointer to a given value is destroyed, the pointed-to value is
/// also destroyed.
/// a new `Arc` instance, which points to the same value on the heap as the
/// source `Arc`, while increasing a reference count. When the last `Arc`
/// pointer to a given value is destroyed, the pointed-to value is also
/// destroyed.
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Sounds better now!

///
/// Shared references in Rust disallow mutation by default, and `Arc` is no
/// exception: you cannot generally obtain a mutable reference to something
Expand Down Expand Up @@ -107,7 +108,7 @@ const MAX_REFCOUNT: usize = (isize::MAX) as usize;
/// // The two syntaxes below are equivalent.
/// let a = foo.clone();
/// let b = Arc::clone(&foo);
/// // a and b both point to the same memory location as foo.
/// // a, b, and foo are all Arcs that point to the same memory location
/// ```
///
/// The [`Arc::clone(&from)`] syntax is the most idiomatic because it conveys more explicitly
Expand Down