4#ifndef ROOT_Math_GenVector_CylindricalEta3Dfwd 
    5#define ROOT_Math_GenVector_CylindricalEta3Dfwd  1 
   18class CylindricalEta3D;
 
Namespace for new Math classes and functions.
 
tbb::task_arena is an alias of tbb::interface7::task_arena, which doesn't allow to forward declare tb...