[libgee/collections-new-virtuals] Temp

[Maciej Marcin Piechotka <mpiechotka src gnome org>]

commit 8ed0c659cd0ce24dd204e94c8c1df0213e7e9d54
Author: Maciej Piechotka <uzytkownik2 gmail com>
Date:   Sat Oct 6 06:42:23 2012 +0100

    Temp

 gee/collection.vala |   38 +++++++++-----------------------------
 1 files changed, 9 insertions(+), 29 deletions(-)
---
diff --git a/gee/collection.vala b/gee/collection.vala
index e480450..5f7f6a7 100644
--- a/gee/collection.vala
+++ b/gee/collection.vala
@@ -85,15 +85,7 @@ public interface Gee.Collection<G> : Iterable<G> {
         * @return     ``true`` if the collection has been changed, ``false`` otherwise
         */
        public virtual bool add_all (Collection<G> collection) {
-               if (collection.is_empty) {
-                       return false;
-               }
-
-               bool changed = false;
-               foreach (G item in collection) {
-                       changed = changed | add (item);
-               }
-               return changed;
+               return collection.fold<bool> ((item, changed) => changed | add (item), false);
        }
 
        /**
@@ -106,16 +98,7 @@ public interface Gee.Collection<G> : Iterable<G> {
         * @return     ``true`` if the collection has been changed, ``false`` otherwise
         */
        public virtual bool contains_all (Collection<G> collection) {
-               if (collection.size > size) {
-                       return false;
-               }
-
-               foreach (G item in collection) {
-                       if (!contains (item)) {
-                               return false;
-                       }
-               }
-               return true;
+               return collection.foreach ((item) => contains (item));
        }
 
        /**
@@ -130,11 +113,7 @@ public interface Gee.Collection<G> : Iterable<G> {
         * @return     ``true`` if the collection has been changed, ``false`` otherwise
         */
        public virtual bool remove_all (Collection<G> collection) {
-               bool changed = false;
-               foreach (G item in collection) {
-                       changed = changed | remove (item);
-               }
-               return changed;
+               return collection.fold<bool> ((item, changed) => changed | remove (item), false);
        }
 
        /**
@@ -149,11 +128,12 @@ public interface Gee.Collection<G> : Iterable<G> {
         */
        public virtual bool retain_all (Collection<G> collection) {
                bool changed = false;
-               G[] items = to_array ();
-               int size_of_items = size;
-               for (int index = 0; index < size_of_items; index++) {
-                       if (!collection.contains (items[index])) {
-                               changed = changed | remove (items[index]);
+               for (Iterator<G> iter = iterator(); iter.next ();) {
+                       G item = iter.get ();
+                       stderr.printf ("%s\n", (string)item);
+                       if (!collection.contains (item)) {
+                               iter.remove ();
+                               changed = true;
                        }
                }
                return changed;