Function ntex_service::fn_mut_service

pub fn fn_mut_service<F, Fut, Req, Res, Err>(
    f: F
) -> FnMutService<F, Fut, Req, Res, Err> where
    F: FnMut(Req) -> Fut,
    Fut: Future<Output = Result<Res, Err>>, 

Create Service for mut function that can act as a Service