planets_factory.cc
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	#include "planets_factory.hh"
	#include "compute_gravity.hh"
	#include "compute_verlet_integration.hh"
	#include "csv_reader.hh"
	#include "csv_writer.hh"
	#include "planet.hh"
	#include <cmath>
	/* -------------------------------------------------------------------------- */

	std::unique_ptr<Particle> PlanetsFactory::createParticle() {

	return std::make_unique<Planet>();

	}

	/* -------------------------------------------------------------------------- */

	SystemEvolution& PlanetsFactory::createSimulation(const std::string& fname,
	Real timestep) {

	this->system_evolution =
	std::make_unique<SystemEvolution>(std::make_unique<System>());

	CsvReader reader(fname);
	reader.read(this->system_evolution->getSystem());

	auto gravity = std::make_shared<ComputeGravity>();
	auto verlet = std::make_shared<ComputeVerletIntegration>(timestep);

	verlet->addInteraction(gravity);
	this->system_evolution->addCompute(verlet);

	return *this->system_evolution;

	}

	/* -------------------------------------------------------------------------- */

	ParticlesFactoryInterface& PlanetsFactory::getInstance() {

	if (not ParticlesFactoryInterface::factory)
	ParticlesFactoryInterface::factory = new PlanetsFactory;

	return *factory;

	}
	/* -------------------------------------------------------------------------- */