hp::Collection::CollectionIterator: add some more comparisons.

These are required by _GLIBCXX_DEBUG.

diff --git a/include/deal.II/hp/collection.h b/include/deal.II/hp/collection.h
index 22781fea136b8ae872d439ab36c3c49e9a28a29e..d9ed5521c5b8b37971d2f4ba47377ead09e23c74 100644 (file)
--- a/include/deal.II/hp/collection.h
+++ b/include/deal.II/hp/collection.h
@@ -88,6 +88,46 @@ namespace hp
       return this->index != other.index;
     }
 
+    /**
+     * Compare indices.
+     */
+    bool
+    operator<(const CollectionIterator<T> &other) const
+    {
+      Assert(this->data == other.data, ExcDifferentCollection());
+      return this->index < other.index;
+    }
+
+    /**
+     * Compare indices.
+     */
+    bool
+    operator<=(const CollectionIterator<T> &other) const
+    {
+      Assert(this->data == other.data, ExcDifferentCollection());
+      return this->index <= other.index;
+    }
+
+    /**
+     * Compare indices.
+     */
+    bool
+    operator>(const CollectionIterator<T> &other) const
+    {
+      Assert(this->data == other.data, ExcDifferentCollection());
+      return this->index > other.index;
+    }
+
+    /**
+     * Compare indices.
+     */
+    bool
+    operator>=(const CollectionIterator<T> &other) const
+    {
+      Assert(this->data == other.data, ExcDifferentCollection());
+      return this->index >= other.index;
+    }
+
     /**
      * Dereferencing operator: returns the value of the current index.
      */