Remove AlwaysSome

kernel/aster-nix/src/net/socket/ip/always_some.rs

@@ -1,54 +0,0 @@
-// SPDX-License-Identifier: MPL-2.0
-
-use core::ops::{Deref, DerefMut};
-
-use crate::prelude::*;
-
-/// AlwaysSome is a wrapper for Option.
-///
-/// AlwaysSome should always be Some(T), so we can treat it as a smart pointer.
-/// If it becomes None, the AlwaysSome should be viewed invalid and cannot be used anymore.
-pub struct AlwaysSome<T>(Option<T>);
-
-impl<T> AlwaysSome<T> {
-    pub fn new(value: T) -> Self {
-        AlwaysSome(Some(value))
-    }
-
-    pub fn try_take_with<R, E: Into<Error>, F: FnOnce(T) -> core::result::Result<R, (E, T)>>(
-        &mut self,
-        f: F,
-    ) -> Result<R> {
-        let value = if let Some(value) = self.0.take() {
-            value
-        } else {
-            return_errno_with_message!(Errno::EINVAL, "the take cell is none");
-        };
-        match f(value) {
-            Ok(res) => Ok(res),
-            Err((err, t)) => {
-                self.0 = Some(t);
-                Err(err.into())
-            }
-        }
-    }
-
-    /// Takes inner value
-    pub fn take(&mut self) -> T {
-        debug_assert!(self.0.is_some());
-        self.0.take().unwrap()
-    }
-}
-
-impl<T> Deref for AlwaysSome<T> {
-    type Target = T;
-    fn deref(&self) -> &Self::Target {
-        self.0.as_ref().unwrap()
-    }
-}
-
-impl<T> DerefMut for AlwaysSome<T> {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        self.0.as_mut().unwrap()
-    }
-}