From: mandeep Date: Tue, 9 Oct 2018 05:51:22 +0000 (-0400) Subject: Refactor macro comment and add resize with zeros example X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=1e584bf5c9858bee54a9fbff25ab28b2ad29eb57;p=rust.git Refactor macro comment and add resize with zeros example --- diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs index 3188de51266..f7a0bbdceaf 100644 --- a/src/liballoc/vec.rs +++ b/src/liballoc/vec.rs @@ -121,12 +121,16 @@ /// ``` /// /// It can also initialize each element of a `Vec` with a given value. -/// Initializing a `Vec` in this manner is the most efficient and safest way to allocate a -/// vector of zeros as previously zeroed memory is requested from the operating system: +/// 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` as an efficient stack: