fn try_all()

in gazebo/src/ext/iter.rs [256:277]

• 20 lines of code
• 1 McCabe index (conditional complexity)

    fn try_all<F, E>(mut self, f: F) -> Result<bool, E>
    where
        Self: Sized,
        F: FnMut(Self::Item) -> Result<bool, E>,
    {
        // TODO migrate use of Result<(), Option<E>> to ControlFlow when it's no longer unstable
        fn check<T, E>(
            mut f: impl FnMut(T) -> Result<bool, E>,
        ) -> impl FnMut((), T) -> Result<(), Option<E>> {
            move |(), x| match f(x) {
                Ok(true) => Ok(()),
                Ok(false) => Err(None),
                Err(e) => Err(Some(e)),
            }
        }

        match self.try_fold((), check(f)) {
            Ok(()) => Ok(true),
            Err(None) => Ok(false),
            Err(Some(e)) => Err(e),
        }
    }