namespace NumericMethods

class Gear;
class GearUserProc;
struct GearEngineContext;
class GearEngineCallback;

class Gear
{
public:
  void set(int n, GearUserProc* derFunc, GearUserProc* jacFunc);
  void setCallback(GearEngineCallback& f) { callback = &f;}
   
  Message solve(const double t_begin, const double t_end, const double* y0);

};