ode.h

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#pragma once
#include <functional>
#include "blas1.h"
#include "backend/tensor_traits.h"
 
namespace dg
{
 
enum class to
{
    exact, 
    at_least 
};
 
inline static std::string to2str( enum to mode)
{
    std::string s;
    switch(mode)
    {
        case(dg::to::exact): s = "exact"; break;
        case(dg::to::at_least): s = "at_least"; break;
        default: s = "Not specified!!";
    }
    return s;
}
 
template<class ContainerType>
struct aTimeloop
{
    using value_type = dg::get_value_type<ContainerType>;
    using container_type = ContainerType;
 
    void integrate( value_type t0, const ContainerType& u0,
                   value_type t1, ContainerType& u1)
    {
        if( t0 == t1)
        {
            dg::blas1::copy( u0, u1);
            return;
        }
        value_type time = t0;
        try{
            do_integrate( time, u0, t1, u1, dg::to::exact);
        }
        catch ( dg::Error& err)
        {
            err.append_line( dg::Message(_ping_) << "Error in aTimeloop::integrate at time "<<time<<" with t0 "<<t0<<" and t1 "<<t1);
            throw;
        }
    }
 
    void integrate( value_type& t0, const ContainerType& u0,
                   value_type t1, ContainerType& u1, enum to mode )
    {
        if( t0 == t1)
        {
            dg::blas1::copy( u0, u1);
            return;
        }
 
        value_type t_begin = t0;
        try{
            do_integrate( t0, u0, t1, u1, mode);
        }
        catch ( dg::Error& err)
        {
            err.append_line( dg::Message(_ping_) << "Error in aTimeloop::integrate at time "<<t0<<" with t0 "<<t_begin<<" and t1 "<<t1 << " and mode "<<to2str(mode));
            throw;
        }
    }
 
    value_type get_dt() const { return do_dt(); }
 
 
    virtual aTimeloop* clone() const=0;
 
    virtual ~aTimeloop(){}
    protected:
    aTimeloop(){}
    aTimeloop(const aTimeloop& ){}
    aTimeloop& operator=(const aTimeloop& ){ return *this; }
    private:
    // the bool indicates whether or not to check the end time condition
    virtual void do_integrate(value_type& t0, const container_type& u0,
            value_type t1, container_type& u1, enum to mode) const = 0;
    virtual value_type do_dt() const = 0;
 
 
};
 
 
}//namespace dg