4 files changed, 100 insertions, 1 deletions

diff --git a/src/clj/clojure/core.clj b/src/clj/clojure/core.clj
index 8e716cf4..42c359ee 100644
--- a/src/clj/clojure/core.clj
+++ b/src/clj/clojure/core.clj
@@ -4544,6 +4544,18 @@
   [#^clojure.lang.ITransientVector coll] 
   (.pop coll)) 
 
+(defn disj!
+  "disj[oin]. Returns a transient set of the same (hashed/sorted) type, that
+  does not contain key(s)."
+  ([set] set)
+  ([#^clojure.lang.ITransientSet set key]
+   (. set (disjoin key)))
+  ([set key & ks]
+   (let [ret (disj set key)]
+     (if ks
+       (recur ret (first ks) (next ks))
+       ret))))
+
 ;redef into with batch support
 (defn into
   "Returns a new coll consisting of to-coll with all of the items of
diff --git a/src/jvm/clojure/lang/ATransientSet.java b/src/jvm/clojure/lang/ATransientSet.java
new file mode 100644
index 00000000..6eec807a
--- /dev/null
+++ b/src/jvm/clojure/lang/ATransientSet.java
@@ -0,0 +1,54 @@
+/**
+ *   Copyright (c) Rich Hickey. All rights reserved.
+ *   The use and distribution terms for this software are covered by the
+ *   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
+ *   which can be found in the file epl-v10.html at the root of this distribution.
+ *   By using this software in any fashion, you are agreeing to be bound by
+ * 	 the terms of this license.
+ *   You must not remove this notice, or any other, from this software.
+ **/
+
+/* rich Mar 3, 2008 */
+
+package clojure.lang;
+
+public abstract class ATransientSet extends AFn implements ITransientSet{
+	ITransientMap impl;
+
+	ATransientSet(ITransientMap impl) {
+		this.impl = impl;
+	}
+	
+	public int count() {
+		return impl.count();
+	}
+
+	public ITransientSet conj(Object val) {
+		ITransientMap m = impl.assoc(val, val);
+		if (m != impl) this.impl = m;
+		return this;
+	}
+
+	public boolean contains(Object key) {
+		return this != impl.valAt(key, this);
+	}
+
+	public ITransientSet disjoin(Object key) throws Exception {
+		ITransientMap m = impl.without(key);
+		if (m != impl) this.impl = m;
+		return this;
+	}
+
+	public Object get(Object key) {
+		return impl.valAt(key);
+	}
+
+	public Object invoke(Object key, Object notFound) throws Exception {
+		return impl.valAt(key, notFound);
+	}
+
+	public Object invoke(Object key) throws Exception {
+		return impl.valAt(key);	
+	}
+	
+}
diff --git a/src/jvm/clojure/lang/ITransientSet.java b/src/jvm/clojure/lang/ITransientSet.java
new file mode 100644
index 00000000..b7a369cb
--- /dev/null
+++ b/src/jvm/clojure/lang/ITransientSet.java
@@ -0,0 +1,19 @@
+/**
+ *   Copyright (c) Rich Hickey. All rights reserved.
+ *   The use and distribution terms for this software are covered by the
+ *   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
+ *   which can be found in the file epl-v10.html at the root of this distribution.
+ *   By using this software in any fashion, you are agreeing to be bound by
+ * 	 the terms of this license.
+ *   You must not remove this notice, or any other, from this software.
+ **/
+
+/* rich Mar 3, 2008 */
+
+package clojure.lang;
+
+public interface ITransientSet extends ITransientCollection, Counted{
+	public ITransientSet disjoin(Object key) throws Exception;
+	public boolean contains(Object key);
+	public Object get(Object key);
+}
diff --git a/src/jvm/clojure/lang/PersistentHashSet.java b/src/jvm/clojure/lang/PersistentHashSet.java
index 35c6fa95..73a5a61f 100644
--- a/src/jvm/clojure/lang/PersistentHashSet.java
+++ b/src/jvm/clojure/lang/PersistentHashSet.java
@@ -14,7 +14,7 @@ package clojure.lang;
 
 import java.util.List;
 
-public class PersistentHashSet extends APersistentSet{
+public class PersistentHashSet extends APersistentSet implements IEditableCollection {
 
 static public final PersistentHashSet EMPTY = new PersistentHashSet(null, PersistentHashMap.EMPTY);
 
@@ -69,4 +69,18 @@ public PersistentHashSet withMeta(IPersistentMap meta){
 	return new PersistentHashSet(meta, impl);
 }
 
+public ITransientCollection asTransient() {
+	return new TransientHashSet(((PersistentHashMap) impl).asTransient());
+}
+
+static final class TransientHashSet extends ATransientSet {
+	TransientHashSet(ITransientMap impl) {
+		super(impl);
+	}
+
+	public IPersistentCollection persistent() {
+		return new PersistentHashSet(null, impl.persistent());
+	}
+}
+
 }