diff --git a/src/flux_function.h b/src/flux_function.h
new file mode 100644
--- /dev/null
+++ b/src/flux_function.h
@@ -0,0 +1,22 @@
+/*
+ *  flux_function.h
+ *  VirtualLeaf
+ *
+ *  Created by Roeland Merks on 07-06-10.
+ *  Copyright 2010 __MyCompanyName__. All rights reserved.
+ *
+ */
+
+// This header file defines a macro "SumFluxFromWalls" that attempts to hide this 
+// horrendously confusing member function wrapper construct from VirtualLeaf's end users
+
+// required format of flux_function is:
+// double [model class name]::[function name](CellBase *this_cell, CellBase *adjacent_cell, Wall *w)
+// e.g.:
+// double MyModel::PINflux(CellBase *this_cell, CellBase *adjacent_cell, Wall *w)
+
+#include "far_mem_5.h"
+
+#define SumFluxFromWalls( _vleafcellp_, _flux_function_ ) \
+(( _vleafcellp_->ReduceCellAndWalls<double>( far_3_arg_mem_fun( *this, &_flux_function_ ) ) ))
+