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Add doc comments about safest way to initialize a vector of zeros #54860

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Merged
merged 2 commits into from
Oct 12, 2018
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Add doc comments about safest way to initialize a vector of zeros #54860

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82444aa
Add doc comments about safest way to initialize a vector of zeros
mandeep Oct 5, 2018
1e584bf
Refactor macro comment and add resize with zeros example
mandeep Oct 9, 2018
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8 changes: 7 additions & 1 deletion src/liballoc/vec.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -120,11 +120,17 @@ use raw_vec::RawVec;
/// assert_eq!(vec, [1, 2, 3, 4]);
/// ```
///
/// It can also initialize each element of a `Vec<T>` with a given value:
/// It can also initialize each element of a `Vec<T>` with a given value.
/// This may be more efficient than performing allocation and initialization
/// in separate steps, especially when initializing a vector of zeros:
///
/// ```
/// let vec = vec![0; 5];
/// assert_eq!(vec, [0, 0, 0, 0, 0]);
///
/// // The following is equivalent, but potentially slower:
/// let mut vec1 = Vec::with_capacity(5);
/// vec1.resize(5, 0);
/// ```
///
/// Use a `Vec<T>` as an efficient stack:
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