diff options
| author | Craig Ferguson <me@craigfe.io> | 2022-10-31 10:40:38 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-10-31 11:40:38 +0100 |
| commit | fc06c7df6392b1054efbf99217290dc9bc28ec34 (patch) | |
| tree | e46256bb3c70358596c96b7ac86d4eb624ab2aae /stdlib/listLabels.mli | |
| parent | cc3d9cb9bbe594b89e0339c6ef8b1da74a537972 (diff) | |
| download | ocaml-fc06c7df6392b1054efbf99217290dc9bc28ec34.tar.gz | |
stdlib: add `List.is_empty` (#10464)
As of #10681, the native compiler is able to simplify this
pattern-matching to use bitwise operations rather than an explicit
branch (as was previously the case) or an integer comparison (as is the
case for the implementation using `( = )`).
Co-authored-by: David Allsopp <david.allsopp@metastack.com>
Diffstat (limited to 'stdlib/listLabels.mli')
| -rw-r--r-- | stdlib/listLabels.mli | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/stdlib/listLabels.mli b/stdlib/listLabels.mli index 832d7de753..5669bf80d4 100644 --- a/stdlib/listLabels.mli +++ b/stdlib/listLabels.mli @@ -57,6 +57,12 @@ val compare_length_with : 'a list -> len:int -> int @since 4.05.0 *) +val is_empty : 'a list -> bool +(** [is_empty l] is true if and only if [l] has no elements. It is equivalent to + [compare_length_with l 0 = 0]. + @since 5.1 + *) + val cons : 'a -> 'a list -> 'a list (** [cons x xs] is [x :: xs] @since 4.03.0 (4.05.0 in ListLabels) |