+// ----------------------------------------------------------------------------
+// private helpers
+// ----------------------------------------------------------------------------
+
+namespace
+{
+
+ // ensure that first is less or equal to second, swapping the values if
+ // necessary
+ void EnsureFirstLessThanSecond(int& first, int& second)
+ {
+ if ( first > second )
+ wxSwap(first, second);
+ }
+
+} // anonymous namespace
+