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// //! borrowed from [http::Extensions](https://docs.rs/http/0.2.7/http/index.html)
// //!
// //! https://docs.rs/http/latest/src/http/extensions.rs.html#35-39
// //!
// use std::any::{Any, TypeId};
// use std::collections::HashMap;
// use std::fmt;
// use std::hash::{BuildHasherDefault, Hasher};
// type AnyMap = HashMap<TypeId, Box<dyn Any + Send + Sync>, BuildHasherDefault<IdHasher>>;
// // With TypeIds as keys, there's no need to hash them. They are already hashes
// // themselves, coming from the compiler. The IdHasher just holds the u64 of
// // the TypeId, and then returns it, instead of doing any bit fiddling.
// #[derive(Default)]
// struct IdHasher(u64);
// impl Hasher for IdHasher {
// fn write(&mut self, _: &[u8]) {
// unreachable!("TypeId calls write_u64");
// }
// #[inline]
// fn write_u64(&mut self, id: u64) {
// self.0 = id;
// }
// #[inline]
// fn finish(&self) -> u64 {
// self.0
// }
// }
// /// A type map of protocol extensions.
// ///
// /// `Extensions` can be used by `Request` and `Response` to store
// /// extra data derived from the underlying protocol.
// #[derive(Default)]
// pub(crate) struct Extensions {
// // If extensions are never used, no need to carry around an empty HashMap.
// // That's 3 words. Instead, this is only 1 word.
// map: Option<Box<AnyMap>>,
// }
// impl Extensions {
// /// Create an empty `Extensions`.
// #[inline]
// pub fn new() -> Extensions {
// Extensions { map: None }
// }
// /// Insert a type into this `Extensions`.
// ///
// /// If a extension of this type already existed, it will
// /// be returned.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext = Extensions::new();
// /// assert!(ext.insert(5i32).is_none());
// /// assert!(ext.insert(4u8).is_none());
// /// assert_eq!(ext.insert(9i32), Some(5i32));
// /// ```
// pub fn insert<T: Send + Sync + 'static>(&mut self, val: T) -> Option<T> {
// self.map
// .get_or_insert_with(|| Box::new(HashMap::default()))
// .insert(TypeId::of::<T>(), Box::new(val))
// .and_then(|boxed| {
// (boxed as Box<dyn Any + 'static>)
// .downcast()
// .ok()
// .map(|boxed| *boxed)
// })
// }
// /// Get a reference to a type previously inserted on this `Extensions`.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext = Extensions::new();
// /// assert!(ext.get::<i32>().is_none());
// /// ext.insert(5i32);
// ///
// /// assert_eq!(ext.get::<i32>(), Some(&5i32));
// /// ```
// pub fn get<T: Send + Sync + 'static>(&self) -> Option<&T> {
// self.map
// .as_ref()
// .and_then(|map| map.get(&TypeId::of::<T>()))
// .and_then(|boxed| (&**boxed as &(dyn Any + 'static)).downcast_ref())
// }
// /// Get a mutable reference to a type previously inserted on this `Extensions`.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext = Extensions::new();
// /// ext.insert(String::from("Hello"));
// /// ext.get_mut::<String>().unwrap().push_str(" World");
// ///
// /// assert_eq!(ext.get::<String>().unwrap(), "Hello World");
// /// ```
// pub fn get_mut<T: Send + Sync + 'static>(&mut self) -> Option<&mut T> {
// self.map
// .as_mut()
// .and_then(|map| map.get_mut(&TypeId::of::<T>()))
// .and_then(|boxed| (&mut **boxed as &mut (dyn Any + 'static)).downcast_mut())
// }
// /// Remove a type from this `Extensions`.
// ///
// /// If a extension of this type existed, it will be returned.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext = Extensions::new();
// /// ext.insert(5i32);
// /// assert_eq!(ext.remove::<i32>(), Some(5i32));
// /// assert!(ext.get::<i32>().is_none());
// /// ```
// pub fn remove<T: Send + Sync + 'static>(&mut self) -> Option<T> {
// self.map
// .as_mut()
// .and_then(|map| map.remove(&TypeId::of::<T>()))
// .and_then(|boxed| {
// (boxed as Box<dyn Any + 'static>)
// .downcast()
// .ok()
// .map(|boxed| *boxed)
// })
// }
// /// Clear the `Extensions` of all inserted extensions.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext = Extensions::new();
// /// ext.insert(5i32);
// /// ext.clear();
// ///
// /// assert!(ext.get::<i32>().is_none());
// /// ```
// #[inline]
// pub fn clear(&mut self) {
// if let Some(ref mut map) = self.map {
// map.clear();
// }
// }
// /// Check whether the extension set is empty or not.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext = Extensions::new();
// /// assert!(ext.is_empty());
// /// ext.insert(5i32);
// /// assert!(!ext.is_empty());
// /// ```
// #[inline]
// pub fn is_empty(&self) -> bool {
// self.map.as_ref().map_or(true, |map| map.is_empty())
// }
// /// Get the numer of extensions available.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext = Extensions::new();
// /// assert_eq!(ext.len(), 0);
// /// ext.insert(5i32);
// /// assert_eq!(ext.len(), 1);
// /// ```
// #[inline]
// pub fn len(&self) -> usize {
// self.map.as_ref().map_or(0, |map| map.len())
// }
// /// Extends `self` with another `Extensions`.
// ///
// /// If an instance of a specific type exists in both, the one in `self` is overwritten with the
// /// one from `other`.
// ///
// /// # Example
// ///
// /// ```
// /// # use http::Extensions;
// /// let mut ext_a = Extensions::new();
// /// ext_a.insert(8u8);
// /// ext_a.insert(16u16);
// ///
// /// let mut ext_b = Extensions::new();
// /// ext_b.insert(4u8);
// /// ext_b.insert("hello");
// ///
// /// ext_a.extend(ext_b);
// /// assert_eq!(ext_a.len(), 3);
// /// assert_eq!(ext_a.get::<u8>(), Some(&4u8));
// /// assert_eq!(ext_a.get::<u16>(), Some(&16u16));
// /// assert_eq!(ext_a.get::<&'static str>().copied(), Some("hello"));
// /// ```
// pub fn extend(&mut self, other: Self) {
// if let Some(other) = other.map {
// if let Some(map) = &mut self.map {
// map.extend(*other);
// } else {
// self.map = Some(other);
// }
// }
// }
// }
// impl fmt::Debug for Extensions {
// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// f.debug_struct("Extensions").finish()
// }
// }
// #[test]
// fn test_extensions() {
// #[derive(Debug, PartialEq)]
// struct MyType(i32);
// let mut extensions = Extensions::new();
// extensions.insert(5i32);
// extensions.insert(MyType(10));
// assert_eq!(extensions.get(), Some(&5i32));
// assert_eq!(extensions.get_mut(), Some(&mut 5i32));
// assert_eq!(extensions.remove::<i32>(), Some(5i32));
// assert!(extensions.get::<i32>().is_none());
// assert_eq!(extensions.get::<bool>(), None);
// assert_eq!(extensions.get(), Some(&MyType(10)));
// }