WeakEquationChargeDiffusion.h
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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