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#ifndef WEAK_EQUATION_CHARGE_DIFFUSION_H
#define WEAK_EQUATION_CHARGE_DIFFUSION_H
#include <set>
#include <string>
#include "WeakEquation.h"
namespace ATC{
/**
* @class WeakEquationChargeDiffusion
* @brief Charge density computation
* int M q = sum_s N q_s
*/
class WeakEquationChargeDiffusion : public WeakEquation {
public:
// constructor
WeakEquationChargeDiffusion();
// destructor
virtual ~WeakEquationChargeDiffusion();
/** density that used to form the mass matrix */
virtual bool has_M_integrand(void) const {return true;}
virtual void M_integrand(const FIELD_MATS &fields,
const Material * material,
DENS_MAT &density ) const ;
/** necessary interfaces */
virtual std::set<std::string> needs_material_functions(void) const
{
std::set<std::string> needs;
return needs;
}
};
};
#endif
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