rungekutta2.hh

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#ifndef rungekutta2_hh
#define rungekutta2_hh
 
#include "basics/typedefs.hh"
#include "function/vector.hh"
#include "strategy.hh"
 
namespace concepts {
  template<typename F>
  class Operator;
}
 
namespace timestepping {
 
  using concepts::Real;
 
  class TimeVector;
 
  // ************************************************* Runge Kutta 2nd order **
 
  class RungeKutta2 : public TimeStepStrategy {
  public:
    RungeKutta2(concepts::SolverFabric<Real>& fabric,
                concepts::Operator<Real>& D1,
                concepts::Operator<Real>& D0,
                timestepping::TimeVector& trhs,
                const concepts::Vector<Real>& Y0,
                Real dt,
                Real alpha = 0.5);
    virtual ~RungeKutta2();
  protected:
    virtual std::ostream& info(std::ostream& os) const;
    virtual void next();
  private:
    concepts::Operator<Real> &D0_;
    timestepping::TimeVector &trhs_;
    concepts::Vector<Real> Yn1_;    // Yn1 = Y(t_{n-1})
    Real alpha_;
  };
 
}
 
#endif // rungekutta2_hh