Duplicated IndexPath extension to NSIndexPath

For Objective-C usage

Source/Utility/IndexPath+DataGrid.swift

@@ -38,3 +38,33 @@ public extension IndexPath {
         return self[0]
     }
 }
+
+
+public extension NSIndexPath {
+    /**
+     Returns an index-path object initialized with the indexes of a specific row and column in a data grid view.
+
+     - parameter column: An index number identifying a column in a DataGridView object in a row identified by the row parameter.
+     - parameter row:    An index number identifying a row in a DataGridView object.
+
+     - returns: An NSIndexPath object.
+     */
+    convenience init(forColumn column: Int, row: Int) {
+        self.init(item: column, section: row)
+    }
+
+    /// An index number identifying a column in a row of a data grid view. (read-only)
+    var dataGridColumn: Int {
+        return self.index(atPosition: 1)
+    }
+
+    /// An index number identifying a row in a data grid view. (read-only)
+    var dataGridRow: Int {
+        return self.index(atPosition: 0)
+    }
+
+    /// An index number for single-item indexPath
+    var index: Int {
+        return self.index(atPosition: 0)
+    }
+}