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Add guarantee that Vec::default() does not alloc

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Currently `Vec::new()` is guaranteed to not allocate until elements are
pushed onto the `Vec`, but such a guarantee is missing for `Vec`'s
implementation of `Default::default`. This adds such a guarantee for
`Vec::default()` to the API reference.
This commit is contained in:
Jan Behrens 2022-08-22 12:36:44 +02:00
parent a9bb589cd6
commit 0227b71865
1 changed files with 2 additions and 0 deletions
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library/alloc/src/vec/mod.rs
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@ -2927,6 +2927,8 @@ unsafe impl<#[may_dangle] T, A: Allocator> Drop for Vec<T, A> {
#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")] #[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
impl<T> const Default for Vec<T> { impl<T> const Default for Vec<T> {
/// Creates an empty `Vec<T>`. /// Creates an empty `Vec<T>`.
///
/// The vector will not allocate until elements are pushed onto it.
fn default() -> Vec<T> { fn default() -> Vec<T> {
Vec::new() Vec::new()
} }