Function frappe::lift::lift3

pub fn lift3<T, F, S1, S2, S3>(
    f: F, 
    s1: Signal<S1>, 
    s2: Signal<S2>, 
    s3: Signal<S3>
) -> Signal<T> where
    F: Fn(MaybeOwned<S1>, MaybeOwned<S2>, MaybeOwned<S3>) -> T + 'static,
    T: 'static,
    S1: 'static,
    S2: 'static,
    S3: 'static, 

Lifts a function into a signal.