diff options
| -rw-r--r-- | library/core/src/option.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/library/core/src/option.rs b/library/core/src/option.rs index a66ef16e3ca..154e52e288b 100644 --- a/library/core/src/option.rs +++ b/library/core/src/option.rs @@ -2543,3 +2543,27 @@ impl<T> Option<Option<T>> { } } } + +impl<T, const N: usize> [Option<T>; N] { + /// Transposes a `[Option<T>; N]` into a `Option<[T; N]>`. + /// + /// # Examples + /// + /// ``` + /// #![feature(option_array_transpose)] + /// # use std::option::Option; + /// + /// let data = [Some(0); 1000]; + /// let data: Option<[u8; 1000]> = data.transpose(); + /// assert_eq!(data, Some([0; 1000])); + /// + /// let data = [Some(0), None]; + /// let data: Option<[u8; 2]> = data.transpose(); + /// assert_eq!(data, None); + /// ``` + #[inline] + #[unstable(feature = "option_array_transpose", issue = "130828")] + pub fn transpose(self) -> Option<[T; N]> { + self.try_map(core::convert::identity) + } +} |
