core: use movable self to clean up option/result.

Author: Erick Tryzelaar

src/libcore/option.rs

@@ -96,19 +96,6 @@ pub pure fn get_ref<T>(opt: &r/Option<T>) -> &r/T {
     }
 }
 
-pub pure fn expect<T>(opt: Option<T>, reason: ~str) -> T {
-    /*!
-     * Gets the value out of an option without copying, printing a
-     * specified message on failure.
-     *
-     * # Failure
-     *
-     * Fails if the value equals `none`
-     */
-    if opt.is_some() { move option::unwrap(move opt) }
-    else { fail reason }
-}
-
 pub pure fn map<T, U>(opt: &Option<T>, f: fn(x: &T) -> U) -> Option<U> {
     //! Maps a `some` value by reference from one type to another
 
@@ -235,35 +222,46 @@ pub fn swap_unwrap<T>(opt: &mut Option<T>) -> T {
     unwrap(util::replace(opt, None))
 }
 
-pub pure fn unwrap_expect<T>(opt: Option<T>, reason: &str) -> T {
+pub pure fn expect<T>(opt: Option<T>, reason: &str) -> T {
     //! As unwrap, but with a specified failure message.
-    if opt.is_none() { fail reason.to_owned(); }
-    unwrap(move opt)
+    match move opt {
+        Some(move val) => val,
+        None => fail reason.to_owned(),
+    }
 }
 
-// Some of these should change to be &Option<T>, some should not. See below.
 impl<T> Option<T> {
     /// Returns true if the option equals `none`
-    pure fn is_none() -> bool { is_none(&self) }
+    #[inline(always)]
+    pure fn is_none(&self) -> bool { is_none(self) }
+
     /// Returns true if the option contains some value
-    pure fn is_some() -> bool { is_some(&self) }
-}
+    #[inline(always)]
+    pure fn is_some(&self) -> bool { is_some(self) }
 
-impl<T> &Option<T> {
     /**
      * Update an optional value by optionally running its content by reference
      * through a function that returns an option.
      */
-    pure fn chain_ref<U>(f: fn(x: &T) -> Option<U>) -> Option<U> {
+    #[inline(always)]
+    pure fn chain_ref<U>(&self, f: fn(x: &T) -> Option<U>) -> Option<U> {
         chain_ref(self, f)
     }
+
+    /// Maps a `some` value from one type to another by reference
+    #[inline(always)]
+    pure fn map<U>(&self, f: fn(x: &T) -> U) -> Option<U> { map(self, f) }
+
     /// Applies a function to the contained value or returns a default
-    pure fn map_default<U>(def: U, f: fn(x: &T) -> U) -> U
-        { map_default(self, move def, f) }
+    #[inline(always)]
+    pure fn map_default<U>(&self, def: U, f: fn(x: &T) -> U) -> U {
+        map_default(self, move def, f)
+    }
+
     /// Performs an operation on the contained value by reference
-    pure fn iter(f: fn(x: &T)) { iter(self, f) }
-    /// Maps a `some` value from one type to another by reference
-    pure fn map<U>(f: fn(x: &T) -> U) -> Option<U> { map(self, f) }
+    #[inline(always)]
+    pure fn iter(&self, f: fn(x: &T)) { iter(self, f) }
+
     /**
     Gets an immutable reference to the value inside an option.
 
@@ -278,7 +276,29 @@ impl<T> &Option<T> {
     Instead, prefer to use pattern matching and handle the `None`
     case explicitly.
      */
-    pure fn get_ref() -> &self/T { get_ref(self) }
+    #[inline(always)]
+    pure fn get_ref(&self) -> &self/T { get_ref(self) }
+
+    /**
+     * Gets the value out of an option without copying.
+     *
+     * # Failure
+     *
+     * Fails if the value equals `none`
+     */
+    #[inline(always)]
+    pure fn unwrap(self) -> T { unwrap(self) }
+
+    /**
+     * Gets the value out of an option, printing a specified message on
+     * failure
+     *
+     * # Failure
+     *
+     * Fails if the value equals `none`
+     */
+    #[inline(always)]
+    pure fn expect(self, reason: &str) -> T { expect(self, reason) }
 }
 
 impl<T: Copy> Option<T> {
@@ -296,19 +316,17 @@ impl<T: Copy> Option<T> {
     Instead, prefer to use pattern matching and handle the `None`
     case explicitly.
     */
-    pure fn get() -> T { get(self) }
-    pure fn get_default(def: T) -> T { get_default(self, def) }
-    /**
-     * Gets the value out of an option, printing a specified message on
-     * failure
-     *
-     * # Failure
-     *
-     * Fails if the value equals `none`
-     */
-    pure fn expect(reason: ~str) -> T { expect(self, move reason) }
+    #[inline(always)]
+    pure fn get(self) -> T { get(self) }
+
+    #[inline(always)]
+    pure fn get_default(self, def: T) -> T { get_default(self, def) }
+
     /// Applies a function zero or more times until the result is none.
-    pure fn while_some(blk: fn(v: T) -> Option<T>) { while_some(self, blk) }
+    #[inline(always)]
+    pure fn while_some(self, blk: fn(v: T) -> Option<T>) {
+        while_some(self, blk)
+    }
 }
 
 #[test]

src/libcore/pipes.rs

@@ -412,7 +412,7 @@ Fails if the sender closes the connection.
 */
 pub fn recv<T: Owned, Tbuffer: Owned>(
     p: RecvPacketBuffered<T, Tbuffer>) -> T {
-    option::unwrap_expect(try_recv(move p), "connection closed")
+    try_recv(move p).expect("connection closed")
 }
 
 /** Attempts to receive a message from a pipe.
@@ -1102,7 +1102,7 @@ impl<T: Owned> PortSet<T> : GenericPort<T> {
     }
 
     fn recv() -> T {
-        option::unwrap_expect(self.try_recv(), "port_set: endpoints closed")
+        self.try_recv().expect("port_set: endpoints closed")
     }
 
 }

src/libcore/result.rs

@@ -114,7 +114,7 @@ pub pure fn to_either<T: Copy, U: Copy>(res: &Result<U, T>)
  *         ok(parse_bytes(buf))
  *     }
  */
-pub fn chain<T, U, V>(res: Result<T, V>, op: fn(t: T)
+pub pure fn chain<T, U, V>(res: Result<T, V>, op: fn(T)
     -> Result<U, V>) -> Result<U, V> {
     match move res {
         Ok(move t) => op(move t),
@@ -130,7 +130,7 @@ pub fn chain<T, U, V>(res: Result<T, V>, op: fn(t: T)
  * immediately returned.  This function can be used to pass through a
  * successful result while handling an error.
  */
-pub fn chain_err<T, U, V>(
+pub pure fn chain_err<T, U, V>(
     res: Result<T, V>,
     op: fn(t: V) -> Result<T, U>)
     -> Result<T, U> {
@@ -154,7 +154,7 @@ pub fn chain_err<T, U, V>(
  *         print_buf(buf)
  *     }
  */
-pub fn iter<T, E>(res: &Result<T, E>, f: fn(&T)) {
+pub pure fn iter<T, E>(res: &Result<T, E>, f: fn(&T)) {
     match *res {
       Ok(ref t) => f(t),
       Err(_) => ()
@@ -169,7 +169,7 @@ pub fn iter<T, E>(res: &Result<T, E>, f: fn(&T)) {
  * This function can be used to pass through a successful result while
  * handling an error.
  */
-pub fn iter_err<T, E>(res: &Result<T, E>, f: fn(&E)) {
+pub pure fn iter_err<T, E>(res: &Result<T, E>, f: fn(&E)) {
     match *res {
       Ok(_) => (),
       Err(ref e) => f(e)
@@ -190,7 +190,7 @@ pub fn iter_err<T, E>(res: &Result<T, E>, f: fn(&E)) {
  *         parse_bytes(buf)
  *     }
  */
-pub fn map<T, E: Copy, U: Copy>(res: &Result<T, E>, op: fn(&T) -> U)
+pub pure fn map<T, E: Copy, U: Copy>(res: &Result<T, E>, op: fn(&T) -> U)
   -> Result<U, E> {
     match *res {
       Ok(ref t) => Ok(op(t)),
@@ -206,7 +206,7 @@ pub fn map<T, E: Copy, U: Copy>(res: &Result<T, E>, op: fn(&T) -> U)
  * is immediately returned.  This function can be used to pass through a
  * successful result while handling an error.
  */
-pub fn map_err<T: Copy, E, F: Copy>(res: &Result<T, E>, op: fn(&E) -> F)
+pub pure fn map_err<T: Copy, E, F: Copy>(res: &Result<T, E>, op: fn(&E) -> F)
   -> Result<T, F> {
     match *res {
       Ok(copy t) => Ok(t),
@@ -215,58 +215,55 @@ pub fn map_err<T: Copy, E, F: Copy>(res: &Result<T, E>, op: fn(&E) -> F)
 }
 
 impl<T, E> Result<T, E> {
+    #[inline(always)]
     pure fn get_ref(&self) -> &self/T { get_ref(self) }
 
-    pure fn is_ok() -> bool { is_ok(&self) }
+    #[inline(always)]
+    pure fn is_ok(&self) -> bool { is_ok(self) }
 
-    pure fn is_err() -> bool { is_err(&self) }
+    #[inline(always)]
+    pure fn is_err(&self) -> bool { is_err(self) }
 
-    pure fn iter(f: fn(&T)) {
-        match self {
-          Ok(ref t) => f(t),
-          Err(_) => ()
-        }
+    #[inline(always)]
+    pure fn iter(&self, f: fn(&T)) { iter(self, f) }
+
+    #[inline(always)]
+    pure fn iter_err(&self, f: fn(&E)) { iter_err(self, f) }
+
+    #[inline(always)]
+    pure fn unwrap(self) -> T { unwrap(self) }
+
+    #[inline(always)]
+    pure fn unwrap_err(self) -> T { unwrap(self) }
+
+    #[inline(always)]
+    pure fn chain<U>(self, op: fn(T) -> Result<U,E>) -> Result<U,E> {
+        chain(self, op)
     }
 
-    fn iter_err(f: fn(&E)) {
-        match self {
-          Ok(_) => (),
-          Err(ref e) => f(e)
-        }
+    #[inline(always)]
+    pure fn chain_err<F>(self, op: fn(E) -> Result<T,F>) -> Result<T,F> {
+        chain_err(self, op)
     }
 }
 
 impl<T: Copy, E> Result<T, E> {
-    pure fn get() -> T { get(&self) }
+    #[inline(always)]
+    pure fn get(&self) -> T { get(self) }
 
-    fn map_err<F:Copy>(op: fn(&E) -> F) -> Result<T,F> {
-        match self {
-          Ok(copy t) => Ok(t),
-          Err(ref e) => Err(op(e))
-        }
+    #[inline(always)]
+    pure fn map_err<F:Copy>(&self, op: fn(&E) -> F) -> Result<T,F> {
+        map_err(self, op)
     }
 }
 
 impl<T, E: Copy> Result<T, E> {
-    pure fn get_err() -> E { get_err(&self) }
-
-    fn map<U:Copy>(op: fn(&T) -> U) -> Result<U,E> {
-        match self {
-          Ok(ref t) => Ok(op(t)),
-          Err(copy e) => Err(e)
-        }
-    }
-}
-
-impl<T: Copy, E: Copy> Result<T, E> {
-    fn chain<U:Copy>(op: fn(t: T) -> Result<U,E>) -> Result<U,E> {
-        // XXX: Bad copy
-        chain(copy self, op)
-    }
+    #[inline(always)]
+    pure fn get_err(&self) -> E { get_err(self) }
 
-    fn chain_err<F:Copy>(op: fn(t: E) -> Result<T,F>) -> Result<T,F> {
-        // XXX: Bad copy
-        chain_err(copy self, op)
+    #[inline(always)]
+    pure fn map<U:Copy>(&self, op: fn(&T) -> U) -> Result<U,E> {
+        map(self, op)
     }
 }
 
@@ -360,15 +357,17 @@ pub fn iter_vec2<S,T,U:Copy>(ss: &[S], ts: &[T],
 }
 
 /// Unwraps a result, assuming it is an `ok(T)`
-pub fn unwrap<T, U>(res: Result<T, U>) -> T {
+#[inline(always)]
+pub pure fn unwrap<T, U>(res: Result<T, U>) -> T {
     match move res {
       Ok(move t) => move t,
       Err(_) => fail ~"unwrap called on an err result"
     }
 }
 
 /// Unwraps a result, assuming it is an `err(U)`
-pub fn unwrap_err<T, U>(res: Result<T, U>) -> U {
+#[inline(always)]
+pub pure fn unwrap_err<T, U>(res: Result<T, U>) -> U {
     match move res {
       Err(move u) => move u,
       Ok(_) => fail ~"unwrap called on an ok result"