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main.cc
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	#include "compute_gravity.hh"
	#include "compute_verlet_integration.hh"
	#include "csv_reader.hh"
	#include "csv_writer.hh"
	#include "my_types.hh"
	#include "ping_pong_balls_factory.hh"
	#include "planets_factory.hh"
	#include "system.hh"
	/* -------------------------------------------------------------------------- */
	#include <cstdlib>
	#include <iostream>
	#include <sstream>
	/* -------------------------------------------------------------------------- */

	int main(int argc, char** argv) {
	if (argc != 6) {
	std::cout << "Usage: " << argv[0]
	<< " nsteps dump_freq input.csv particle_type timestep"
	<< std::endl;
	std::cout << "\tparticle type can be: planet, ping_pong" << std::endl;
	std::exit(EXIT_FAILURE);
	}


	// the number of steps to perform
	Real nsteps;
	std::stringstream(argv[1]) >> nsteps;
	// freq to dump
	int freq;
	std::stringstream(argv[2]) >> freq;
	// init file
	std::string filename = argv[3];
	// particle type
	std::string type = argv[4];
	// timestep
	Real timestep;
	std::stringstream(argv[5]) >> timestep;

	if (type == "planet")
	PlanetsFactory::getInstance();
	else if (type == "ping_pong")
	PingPongBallsFactory::getInstance();
	else {
	std::cout << "Unknown particle type: " << type << std::endl;
	std::exit(EXIT_FAILURE);
	}

	ParticlesFactoryInterface& factory = ParticlesFactoryInterface::getInstance();

	SystemEvolution& evol = factory.createSimulation(filename, timestep);

	evol.setNSteps(nsteps);
	evol.setDumpFreq(freq);

	evol.evolve();


	return EXIT_SUCCESS;
	}