stdont/
option.rs

1/// Extensions for [`Option<T>`].
2///
3/// See also [ACP #212](https://github.com/rust-lang/libs-team/issues/212)
4pub trait OptionExt<T> {
5    /// Returns `true` if the option is a [`None`] or the value inside of it matches a predicate.
6    ///
7    /// ```rust
8    /// # use stdont::OptionExt as _;
9    ///
10    /// let x: Option<u32> = Some(2);
11    /// assert_eq!(x.is_none_or(|x| x > 1), true);
12    ///
13    /// let x: Option<u32> = Some(0);
14    /// assert_eq!(x.is_none_or(|x| x > 1), false);
15    ///
16    /// let x: Option<u32> = None;
17    /// assert_eq!(x.is_none_or(|x| x > 1), true);
18    /// ```
19    #[allow(clippy::wrong_self_convention)]
20    fn is_none_or(self, f: impl FnOnce(T) -> bool) -> bool;
21}
22
23impl<T> OptionExt<T> for Option<T> {
24    #[inline]
25    fn is_none_or(self, f: impl FnOnce(T) -> bool) -> bool {
26        match self {
27            None => true,
28            Some(x) => f(x),
29        }
30    }
31}
stdont/option.rs

stdont/
option.rs
