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from_fn_boxed

monkey_test::shrinks

Function from_fn_boxed 

Source 
pub fn from_fn_boxed<E, F>(f: F) -> BoxShrink<E>
where
    E: Clone + 'static,
    F: Fn(E) -> BoxIter<E> + Clone + 'static,
Expand description

Create a new shrinker where each request for candidates-iterator calls the provided closure F: Fn(E) -> BoxIter<E> + Clone + 'static.

This function does the same thing as from_fn, but with the exception that the returned iterator must be boxed, as in being a trait object. This can be convenient when the closure want to return one of several different iterator implementations, hence iterator type being unclear.

For more details see from_fn.