ode_backward_euler.h

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#ifndef ODE_BACKWARD_EULER_H_
#define ODE_BACKWARD_EULER_H_
 
 
#include "ode_adaptive.h"
#include "ode_irk.h"
#include "ode_newton_bridge.h"
 
namespace ode {
 
//forward declaration to set up Newton class
class OdeBackwardEuler;
 
class NewtonBackwardEuler : public OdeNewtonIRK<OdeBackwardEuler> {
    public:
 
        NewtonBackwardEuler (unsigned long neq, unsigned long nnew, OdeBackwardEuler *integrator) : OdeNewtonIRK (neq, nnew, integrator) {};
    private:
        void f_Newton (double *x, double *y);
        void J_Newton (double *x, double **J);
};
 
 
class OdeBackwardEuler : public OdeAdaptive, private OdeIRK {
    //friends!
    friend class OdeNewtonBridge<OdeBackwardEuler>;
    friend class OdeNewtonIRK<OdeBackwardEuler>;
 
    public:
 
        OdeBackwardEuler (unsigned long neq);
 
        ~OdeBackwardEuler ();
 
        NewtonBackwardEuler *get_newton () { return(newton_); }
 
    private:
        double **a;
        double *b;
        NewtonBackwardEuler *newton_;
        void step_ (double dt);
};
 
} // namespace ode
 
#endif