add getChild to VararyNode

alib2std/src/extensions/container/tree_base.hpp

@@ -1058,6 +1058,30 @@ public:
 			child.parent = static_cast < Cast * > ( this );
 	}
+	/**
+	 * \brief
+	 * Getter of the child at given index.
+	 *
+	 * \param index the index to retrieve
+	 *
+	 * \return reference to the child at given index
+	 */
+	Data & getChild ( int index ) {
+		return m_children [ index ];
+	}
+
+	/**
+	 * \brief
+	 * Getter of the child at given index.
+	 *
+	 * \param index the index to retrieve
+	 *
+	 * \return reference to the child at given index
+	 */
+	const Data & getChild ( int index ) const {
+		return m_children [ index ];
+	}
+
 	/**
 	 * \brief
 	 * Setter of the single child of the node.