simulation.hh
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	#ifndef SIMULATION_HH
	#define SIMULATION_HH

	/* -------------------------------------------------------------------------- */
	#include "double_buffer.hh"
	#include "dumpers.hh"
	#include "grid.hh"
	/* -------------------------------------------------------------------------- */
	#include <tuple>
	/* -------------------------------------------------------------------------- */

	/* -------------------------------------------------------------------------- */
	class Simulation {
	public:
	Simulation(int m, int n);

	/// set the initial conditions, Dirichlet and source term
	virtual void set_initial_conditions();

	/// perform the simulation
	std::tuple<float, int> compute();

	/// access the precision
	void set_epsilon(float epsilon);
	float epsilon() const;

	protected:
	/// compute one step and return an error
	virtual float compute_step();

	private:
	/// Global problem size
	int m_local_m, m_local_n;

	/// Precision to achieve
	float m_epsilon;

	/// grid spacing
	float m_h_m;
	float m_h_n;

	/// Grids storage
	DoubleBuffer m_grids;

	/// source term
	Grid m_f;

	int m_prank{0}, m_psize{1};

	/// Dumper to use for outputs
	std::unique_ptr<Dumper> m_dumper;
	};

	#endif /* SIMULATION_HH */