Function actix_service::apply_transform

pub fn apply_transform<T, S, F, U>(
    t: F, 
    service: U
) -> impl NewService<Config = S::Config, Request = T::Request, Response = T::Response, Error = T::Error, Service = T::Transform, InitError = S::InitError> + Clone where
    S: NewService,
    T: Transform<S::Service, InitError = S::InitError>,
    F: IntoTransform<T, S::Service>,
    U: IntoNewService<S>, 

Apply transform to service factory. Function returns services factory that in initialization creates service and applies transform to this service.