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-rw-r--r--src/libstd/mutable.rs307
1 files changed, 0 insertions, 307 deletions
diff --git a/src/libstd/mutable.rs b/src/libstd/mutable.rs
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index 44efbc149c1..00000000000
--- a/src/libstd/mutable.rs
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@@ -1,307 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! A mutable memory location with dynamically checked borrow rules
-
-use prelude::*;
-
-use cast;
-use util::NonCopyable;
-
-/// A mutable memory location with dynamically checked borrow rules
-#[no_freeze]
-pub struct Mut<T> {
-    priv value: T,
-    priv borrow: BorrowFlag,
-    priv nc: NonCopyable
-}
-
-// Values [1, MAX-1] represent the number of `Ref` active
-// (will not outgrow its range since `uint` is the size of the address space)
-type BorrowFlag = uint;
-static UNUSED: BorrowFlag = 0;
-static WRITING: BorrowFlag = -1;
-
-impl<T> Mut<T> {
-    /// Create a new `Mut` containing `value`
-    pub fn new(value: T) -> Mut<T> {
-        Mut {
-            value: value,
-            borrow: UNUSED,
-            nc: NonCopyable
-        }
-    }
-
-    /// Consumes the `Mut`, returning the wrapped value.
-    pub fn unwrap(self) -> T {
-        assert!(self.borrow == UNUSED);
-        self.value
-    }
-
-    unsafe fn as_mut<'a>(&'a self) -> &'a mut Mut<T> {
-        cast::transmute_mut(self)
-    }
-
-    /// Attempts to immutably borrow the wrapped value.
-    ///
-    /// The borrow lasts until the returned `Ref` exits scope. Multiple
-    /// immutable borrows can be taken out at the same time.
-    ///
-    /// Returns `None` if the value is currently mutably borrowed.
-    pub fn try_borrow<'a>(&'a self) -> Option<Ref<'a, T>> {
-        match self.borrow {
-            WRITING => None,
-            _ => {
-                unsafe { self.as_mut().borrow += 1; }
-                Some(Ref { parent: self })
-            }
-        }
-    }
-
-    /// Immutably borrows the wrapped value.
-    ///
-    /// The borrow lasts until the returned `Ref` exits scope. Multiple
-    /// immutable borrows can be taken out at the same time.
-    ///
-    /// # Failure
-    ///
-    /// Fails if the value is currently mutably borrowed.
-    pub fn borrow<'a>(&'a self) -> Ref<'a, T> {
-        match self.try_borrow() {
-            Some(ptr) => ptr,
-            None => fail!("Mut<T> already mutably borrowed")
-        }
-    }
-
-    /// Mutably borrows the wrapped value.
-    ///
-    /// The borrow lasts untile the returned `RefMut` exits scope. The value
-    /// cannot be borrowed while this borrow is active.
-    ///
-    /// Returns `None` if the value is currently borrowed.
-    pub fn try_borrow_mut<'a>(&'a self) -> Option<RefMut<'a, T>> {
-        match self.borrow {
-            UNUSED => unsafe {
-                let mut_self = self.as_mut();
-                mut_self.borrow = WRITING;
-                Some(RefMut { parent: mut_self })
-            },
-            _ => None
-        }
-    }
-
-    /// Mutably borrows the wrapped value.
-    ///
-    /// The borrow lasts untile the returned `RefMut` exits scope. The value
-    /// cannot be borrowed while this borrow is active.
-    ///
-    /// # Failure
-    ///
-    /// Fails if the value is currently borrowed.
-    pub fn borrow_mut<'a>(&'a self) -> RefMut<'a, T> {
-        match self.try_borrow_mut() {
-            Some(ptr) => ptr,
-            None => fail!("Mut<T> already borrowed")
-        }
-    }
-
-    /// Immutably borrows the wrapped value and applies `blk` to it.
-    ///
-    /// # Failure
-    ///
-    /// Fails if the value is currently mutably borrowed.
-    #[inline]
-    pub fn with<U>(&self, blk: |&T| -> U) -> U {
-        let ptr = self.borrow();
-        blk(ptr.get())
-    }
-
-    /// Mutably borrows the wrapped value and applies `blk` to it.
-    ///
-    /// # Failure
-    ///
-    /// Fails if the value is currently borrowed.
-    #[inline]
-    pub fn with_mut<U>(&self, blk: |&mut T| -> U) -> U {
-        let mut ptr = self.borrow_mut();
-        blk(ptr.get())
-    }
-}
-
-impl<T: Clone> Clone for Mut<T> {
-    fn clone(&self) -> Mut<T> {
-        let x = self.borrow();
-        Mut::new(x.get().clone())
-    }
-}
-
-impl<T: DeepClone> DeepClone for Mut<T> {
-    fn deep_clone(&self) -> Mut<T> {
-        let x = self.borrow();
-        Mut::new(x.get().deep_clone())
-    }
-}
-
-impl<T: Eq> Eq for Mut<T> {
-    fn eq(&self, other: &Mut<T>) -> bool {
-        let a = self.borrow();
-        let b = other.borrow();
-        a.get() == b.get()
-    }
-}
-
-/// Wraps a borrowed reference to a value in a `Mut` box.
-pub struct Ref<'box, T> {
-    priv parent: &'box Mut<T>
-}
-
-#[unsafe_destructor]
-impl<'box, T> Drop for Ref<'box, T> {
-    fn drop(&mut self) {
-        assert!(self.parent.borrow != WRITING && self.parent.borrow != UNUSED);
-        unsafe { self.parent.as_mut().borrow -= 1; }
-    }
-}
-
-impl<'box, T> Ref<'box, T> {
-    /// Retrieve an immutable reference to the stored value.
-    #[inline]
-    pub fn get<'a>(&'a self) -> &'a T {
-        &self.parent.value
-    }
-}
-
-/// Wraps a mutable borrowed reference to a value in a `Mut` box.
-pub struct RefMut<'box, T> {
-    priv parent: &'box mut Mut<T>
-}
-
-#[unsafe_destructor]
-impl<'box, T> Drop for RefMut<'box, T> {
-    fn drop(&mut self) {
-        assert!(self.parent.borrow == WRITING);
-        self.parent.borrow = UNUSED;
-    }
-}
-
-impl<'box, T> RefMut<'box, T> {
-    /// Retrieve a mutable reference to the stored value.
-    #[inline]
-    pub fn get<'a>(&'a mut self) -> &'a mut T {
-        &mut self.parent.value
-    }
-}
-
-#[cfg(test)]
-mod test {
-    use super::*;
-
-    #[test]
-    fn double_imm_borrow() {
-        let x = Mut::new(0);
-        let _b1 = x.borrow();
-        x.borrow();
-    }
-
-    #[test]
-    fn no_mut_then_imm_borrow() {
-        let x = Mut::new(0);
-        let _b1 = x.borrow_mut();
-        assert!(x.try_borrow().is_none());
-    }
-
-    #[test]
-    fn no_imm_then_borrow_mut() {
-        let x = Mut::new(0);
-        let _b1 = x.borrow();
-        assert!(x.try_borrow_mut().is_none());
-    }
-
-    #[test]
-    fn no_double_borrow_mut() {
-        let x = Mut::new(0);
-        let _b1 = x.borrow_mut();
-        assert!(x.try_borrow_mut().is_none());
-    }
-
-    #[test]
-    fn imm_release_borrow_mut() {
-        let x = Mut::new(0);
-        {
-            let _b1 = x.borrow();
-        }
-        x.borrow_mut();
-    }
-
-    #[test]
-    fn mut_release_borrow_mut() {
-        let x = Mut::new(0);
-        {
-            let _b1 = x.borrow_mut();
-        }
-        x.borrow();
-    }
-
-    #[test]
-    fn double_borrow_single_release_no_borrow_mut() {
-        let x = Mut::new(0);
-        let _b1 = x.borrow();
-        {
-            let _b2 = x.borrow();
-        }
-        assert!(x.try_borrow_mut().is_none());
-    }
-
-    #[test]
-    fn with_ok() {
-        let x = Mut::new(0);
-        assert_eq!(1, x.with(|x| *x+1));
-    }
-
-    #[test]
-    #[should_fail]
-    fn mut_borrow_with() {
-        let x = Mut::new(0);
-        let _b1 = x.borrow_mut();
-        x.with(|x| *x+1);
-    }
-
-    #[test]
-    fn borrow_with() {
-        let x = Mut::new(0);
-        let _b1 = x.borrow();
-        assert_eq!(1, x.with(|x| *x+1));
-    }
-
-    #[test]
-    fn with_mut_ok() {
-        let x = Mut::new(0);
-        x.with_mut(|x| *x += 1);
-        let b = x.borrow();
-        assert_eq!(1, *b.get());
-    }
-
-    #[test]
-    #[should_fail]
-    fn borrow_with_mut() {
-        let x = Mut::new(0);
-        let _b = x.borrow();
-        x.with_mut(|x| *x += 1);
-    }
-
-    #[test]
-    #[should_fail]
-    fn discard_doesnt_unborrow() {
-        let x = Mut::new(0);
-        let _b = x.borrow();
-        let _ = _b;
-        let _b = x.borrow_mut();
-    }
-}
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