Added ArrayCollection::createFrom.

lib/Doctrine/Common/Collections/ArrayCollection.php

@@ -55,6 +55,21 @@ public function __construct(array $elements = array())
         $this->elements = $elements;
     }
 
+    /**
+     * Creates a new instance from the specified elements.
+     *
+     * This method is provided for derived classes to specify how a new
+     * instance should be created when constructor semantics have changed.
+     *
+     * @param array $elements Elements.
+     *
+     * @return static
+     */
+    protected function createFrom(array $elements)
+    {
+        return new static($elements);
+    }
+
     /**
      * {@inheritDoc}
      */
@@ -289,15 +304,15 @@ public function getIterator()
      */
     public function map(Closure $func)
     {
-        return new static(array_map($func, $this->elements));
+        return $this->createFrom(array_map($func, $this->elements));
     }
 
     /**
      * {@inheritDoc}
      */
     public function filter(Closure $p)
     {
-        return new static(array_filter($this->elements, $p));
+        return $this->createFrom(array_filter($this->elements, $p));
     }
 
     /**
@@ -329,7 +344,7 @@ public function partition(Closure $p)
             }
         }
 
-        return array(new static($matches), new static($noMatches));
+        return array($this->createFrom($matches), $this->createFrom($noMatches));
     }
 
     /**
@@ -388,6 +403,6 @@ public function matching(Criteria $criteria)
             $filtered = array_slice($filtered, (int)$offset, $length);
         }
 
-        return new static($filtered);
+        return $this->createFrom($filtered);
     }
 }