#
actix_service/
map_config.rs

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    use core::marker::PhantomData;

    use super::{IntoServiceFactory, ServiceFactory};

    /// Adapt external config argument to a config for provided service factory
    ///
    /// Note that this function consumes the receiving service factory and returns
    /// a wrapped version of it.
    pub fn map_config<I, SF, Req, F, Cfg>(factory: I, f: F) -> MapConfig<SF, Req, F, Cfg>
    where
        I: IntoServiceFactory<SF, Req>,
        SF: ServiceFactory<Req>,
        F: Fn(Cfg) -> SF::Config,
    {
        MapConfig::new(factory.into_factory(), f)
    }

    /// Replace config with unit.
    pub fn unit_config<I, SF, Cfg, Req>(factory: I) -> UnitConfig<SF, Cfg, Req>
    where
        I: IntoServiceFactory<SF, Req>,
        SF: ServiceFactory<Req, Config = ()>,
    {
        UnitConfig::new(factory.into_factory())
    }

    /// `map_config()` adapter service factory
    pub struct MapConfig<SF, Req, F, Cfg> {
        factory: SF,
        cfg_mapper: F,
        e: PhantomData<fn(Cfg, Req)>,
    }

    impl<SF, Req, F, Cfg> MapConfig<SF, Req, F, Cfg> {
        /// Create new `MapConfig` combinator
        pub(crate) fn new(factory: SF, cfg_mapper: F) -> Self
        where
            SF: ServiceFactory<Req>,
            F: Fn(Cfg) -> SF::Config,
        {
            Self {
                factory,
                cfg_mapper,
                e: PhantomData,
            }
        }
    }

    impl<SF, Req, F, Cfg> Clone for MapConfig<SF, Req, F, Cfg>
    where
        SF: Clone,
        F: Clone,
    {
        fn clone(&self) -> Self {
            Self {
                factory: self.factory.clone(),
                cfg_mapper: self.cfg_mapper.clone(),
                e: PhantomData,
            }
        }
    }

    impl<SF, Req, F, Cfg> ServiceFactory<Req> for MapConfig<SF, Req, F, Cfg>
    where
        SF: ServiceFactory<Req>,
        F: Fn(Cfg) -> SF::Config,
    {
        type Response = SF::Response;
        type Error = SF::Error;

        type Config = Cfg;
        type Service = SF::Service;
        type InitError = SF::InitError;
        type Future = SF::Future;

        fn new_service(&self, cfg: Self::Config) -> Self::Future {
            let mapped_cfg = (self.cfg_mapper)(cfg);
            self.factory.new_service(mapped_cfg)
        }
    }

    /// `unit_config()` config combinator
    pub struct UnitConfig<SF, Cfg, Req> {
        factory: SF,
        _phantom: PhantomData<fn(Cfg, Req)>,
    }

    impl<SF, Cfg, Req> UnitConfig<SF, Cfg, Req>
    where
        SF: ServiceFactory<Req, Config = ()>,
    {
        /// Create new `UnitConfig` combinator
        pub(crate) fn new(factory: SF) -> Self {
            Self {
                factory,
                _phantom: PhantomData,
            }
        }
    }

    impl<SF, Cfg, Req> Clone for UnitConfig<SF, Cfg, Req>
    where
        SF: Clone,
    {
        fn clone(&self) -> Self {
            Self {
                factory: self.factory.clone(),
                _phantom: PhantomData,
            }
        }
    }

    impl<SF, Cfg, Req> ServiceFactory<Req> for UnitConfig<SF, Cfg, Req>
    where
        SF: ServiceFactory<Req, Config = ()>,
    {
        type Response = SF::Response;
        type Error = SF::Error;

        type Config = Cfg;
        type Service = SF::Service;
        type InitError = SF::InitError;
        type Future = SF::Future;

        fn new_service(&self, _: Cfg) -> Self::Future {
            self.factory.new_service(())
        }
    }