auto merge of #8054 : sammykim/rust/move-EnumSet, r=alexcrichton

Fix #8004

src/librustc/util/enum_set.rs → src/libextra/enum_set.rs

@@ -11,14 +11,18 @@
 use std::iterator::Iterator;
 
 #[deriving(Clone, Eq, IterBytes, ToStr)]
+/// A specialized Set implementation to use enum types.
 pub struct EnumSet<E> {
     // We must maintain the invariant that no bits are set
     // for which no variant exists
     priv bits: uint
 }
 
+/// An iterface for casting C-like enum to uint and back.
 pub trait CLike {
+    /// Converts C-like enum to uint.
     pub fn to_uint(&self) -> uint;
+    /// Converts uint to C-like enum.
     pub fn from_uint(uint) -> Self;
 }
 
@@ -27,54 +31,47 @@ fn bit<E:CLike>(e: E) -> uint {
 }
 
 impl<E:CLike> EnumSet<E> {
+    /// Returns an empty EnumSet.
     pub fn empty() -> EnumSet<E> {
         EnumSet {bits: 0}
     }
 
+    /// Returns true if an EnumSet is empty.
     pub fn is_empty(&self) -> bool {
         self.bits == 0
     }
 
+    /// Returns true if an EnumSet contains any enum of a given EnumSet
     pub fn intersects(&self, e: EnumSet<E>) -> bool {
         (self.bits & e.bits) != 0
     }
 
+    /// Returns an intersection of both EnumSets.
     pub fn intersection(&self, e: EnumSet<E>) -> EnumSet<E> {
         EnumSet {bits: self.bits & e.bits}
     }
 
+    /// Returns true if a given EnumSet is included in an EnumSet.
     pub fn contains(&self, e: EnumSet<E>) -> bool {
         (self.bits & e.bits) == e.bits
     }
 
+    /// Returns a union of both EnumSets.
     pub fn union(&self, e: EnumSet<E>) -> EnumSet<E> {
         EnumSet {bits: self.bits | e.bits}
     }
 
+    /// Add an enum to an EnumSet
     pub fn add(&mut self, e: E) {
         self.bits |= bit(e);
     }
 
+    /// Returns true if an EnumSet contains a given enum
     pub fn contains_elem(&self, e: E) -> bool {
         (self.bits & bit(e)) != 0
     }
 
-    pub fn each(&self, f: &fn(E) -> bool) -> bool {
-        let mut bits = self.bits;
-        let mut index = 0;
-        while bits != 0 {
-            if (bits & 1) != 0 {
-                let e = CLike::from_uint(index);
-                if !f(e) {
-                    return false;
-                }
-            }
-            index += 1;
-            bits >>= 1;
-        }
-        return true;
-    }
-
+    /// Returns an iterator over an EnumSet
     pub fn iter(&self) -> EnumSetIterator<E> {
         EnumSetIterator::new(self.bits)
     }
@@ -98,6 +95,7 @@ fn bitand(&self, e: &EnumSet<E>) -> EnumSet<E> {
     }
 }
 
+/// An iterator over an EnumSet
 pub struct EnumSetIterator<E> {
     priv index: uint,
     priv bits: uint,
@@ -136,7 +134,7 @@ mod test {
 
     use std::cast;
 
-    use util::enum_set::*;
+    use enum_set::*;
 
     #[deriving(Eq)]
     enum Foo {
@@ -236,7 +234,7 @@ fn test_contains_elem() {
     }
 
     ///////////////////////////////////////////////////////////////////////////
-    // iter / each
+    // iter
 
     #[test]
     fn test_iterator() {
@@ -262,34 +260,6 @@ fn test_iterator() {
         assert_eq!(~[A,B,C], elems)
     }
 
-    #[test]
-    fn test_each() {
-        let mut e1: EnumSet<Foo> = EnumSet::empty();
-
-        assert_eq!(~[], collect(e1))
-
-        e1.add(A);
-        assert_eq!(~[A], collect(e1))
-
-        e1.add(C);
-        assert_eq!(~[A,C], collect(e1))
-
-        e1.add(C);
-        assert_eq!(~[A,C], collect(e1))
-
-        e1.add(B);
-        assert_eq!(~[A,B,C], collect(e1))
-    }
-
-    fn collect(e: EnumSet<Foo>) -> ~[Foo] {
-        let mut elems = ~[];
-        e.each(|elem| {
-           elems.push(elem);
-           true
-        });
-        elems
-    }
-
     ///////////////////////////////////////////////////////////////////////////
     // operators
 

src/libextra/extra.rs

@@ -91,6 +91,7 @@
 pub mod base64;
 pub mod rl;
 pub mod workcache;
+pub mod enum_set;
 #[path="num/bigint.rs"]
 pub mod bigint;
 #[path="num/rational.rs"]

src/librustc/metadata/tyencode.rs

@@ -413,15 +413,14 @@ fn enc_fn_sig(w: @io::Writer, cx: @ctxt, fsig: &ty::FnSig) {
 }
 
 fn enc_bounds(w: @io::Writer, cx: @ctxt, bs: &ty::ParamBounds) {
-    do bs.builtin_bounds.each |bound| {
+    for bound in bs.builtin_bounds.iter() {
         match bound {
             ty::BoundSend => w.write_char('S'),
             ty::BoundFreeze => w.write_char('K'),
             ty::BoundStatic => w.write_char('O'),
             ty::BoundSized => w.write_char('Z'),
         }
-        true
-    };
+    }
 
     for &tp in bs.trait_bounds.iter() {
         w.write_char('I');

src/librustc/middle/kind.rs

@@ -338,12 +338,11 @@ pub fn check_builtin_bounds(cx: Context, ty: ty::t, bounds: ty::BuiltinBounds,
 {
     let kind = ty::type_contents(cx.tcx, ty);
     let mut missing = ty::EmptyBuiltinBounds();
-    do bounds.each |bound| {
+    for bound in bounds.iter() {
         if !kind.meets_bound(cx.tcx, bound) {
             missing.add(bound);
         }
-        true
-    };
+    }
     if !missing.is_empty() {
         any_missing(missing);
     }

src/librustc/middle/ty.rs

@@ -25,7 +25,6 @@
 use util::ppaux::{trait_store_to_str, ty_to_str, vstore_to_str};
 use util::ppaux::{Repr, UserString};
 use util::common::{indenter};
-use util::enum_set::{EnumSet, CLike};
 
 use std::cast;
 use std::cmp;
@@ -48,6 +47,7 @@
 use syntax::opt_vec;
 use syntax::abi::AbiSet;
 use syntax;
+use extra::enum_set::{EnumSet, CLike};
 
 pub static INITIAL_DISCRIMINANT_VALUE: uint = 0;
 
@@ -2287,7 +2287,7 @@ fn trait_contents(store: TraitStore, mutbl: ast::mutability,
         // This is like with typarams below, but less "pessimistic" and also
         // dependent on the trait store.
         let mut bt = TC_NONE;
-        do (AllBuiltinBounds() - bounds).each |bound| {
+        for bound in (AllBuiltinBounds() - bounds).iter() {
             bt = bt + match bound {
                 BoundStatic if bounds.contains_elem(BoundSend)
                             => TC_NONE, // Send bound implies static bound.
@@ -2296,8 +2296,7 @@ fn trait_contents(store: TraitStore, mutbl: ast::mutability,
                 BoundFreeze => TC_MUTABLE,
                 BoundSized  => TC_NONE, // don't care if interior is sized
             };
-            true
-        };
+        }
         st + mt + bt
     }
 
@@ -2308,7 +2307,7 @@ fn type_param_def_to_contents(cx: ctxt,
         let _i = indenter();
 
         let mut tc = TC_ALL;
-        do type_param_def.bounds.builtin_bounds.each |bound| {
+        for bound in type_param_def.bounds.builtin_bounds.iter() {
             debug!("tc = %s, bound = %?", tc.to_str(), bound);
             tc = tc - match bound {
                 BoundStatic => TypeContents::nonstatic(cx),
@@ -2317,8 +2316,7 @@ fn type_param_def_to_contents(cx: ctxt,
                 // The dynamic-size bit can be removed at pointer-level, etc.
                 BoundSized => TypeContents::dynamically_sized(cx),
             };
-            true
-        };
+        }
 
         debug!("result = %s", tc.to_str());
         return tc;

src/librustc/rustc.rs

@@ -96,7 +96,6 @@ pub mod back {
 pub mod util {
     pub mod common;
     pub mod ppaux;
-    pub mod enum_set;
 }
 
 pub mod lib {

src/librustc/util/ppaux.rs

@@ -589,15 +589,14 @@ fn repr(&self, tcx: ctxt) -> ~str {
 impl Repr for ty::ParamBounds {
     fn repr(&self, tcx: ctxt) -> ~str {
         let mut res = ~[];
-        do self.builtin_bounds.each |b| {
+        for b in self.builtin_bounds.iter() {
             res.push(match b {
                 ty::BoundStatic => ~"'static",
                 ty::BoundSend => ~"Send",
                 ty::BoundFreeze => ~"Freeze",
                 ty::BoundSized => ~"Sized",
             });
-            true
-        };
+        }
         for t in self.trait_bounds.iter() {
             res.push(t.repr(tcx));
         }
@@ -833,10 +832,9 @@ impl UserString for ty::BuiltinBounds {
     fn user_string(&self, tcx: ctxt) -> ~str {
         if self.is_empty() { ~"<no-bounds>" } else {
             let mut result = ~[];
-            do self.each |bb| {
+            for bb in self.iter() {
                 result.push(bb.user_string(tcx));
-                true
-            };
+            }
             result.connect("+")
         }
     }