Method filter

ctutils/src/ct_option.rs:301–307

(mut self, predicate: P)

    #[inline]
    #[must_use]
    pub fn filter<P>(mut self, predicate: P) -> Self
    where
        P: FnOnce(&T) -> Choice,
    {
        self.is_some &= predicate(&self.value);
        self
    }

    /// Apply an additional [`Choice`] requirement to `is_some`.
    #[inline]