system_evolution.cc
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	#include "system_evolution.hh"
	#include "csv_writer.hh"
	/* -------------------------------------------------------------------------- */
	#include <iomanip>
	#include <sstream>
	/* -------------------------------------------------------------------------- */

	SystemEvolution::SystemEvolution(std::unique_ptr<System> system)
	: system(std::move(system)) {}

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

	void SystemEvolution::evolve() {

	for (UInt i = 0; i < nsteps; ++i) {

	for (auto & compute : computes)
	compute->compute(*system);

	if (i % freq == 0) {
	std::stringstream sstr;
	sstr << "dumps/step-" << std::setfill('0') << std::setw(5) << i << ".csv";
	CsvWriter dumper(sstr.str());
	dumper.write(*system);
	}
	}

	}

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

	void SystemEvolution::addCompute(const std::shared_ptr<Compute>& compute) {
	computes.push_back(compute);
	}

	/* -------------------------------------------------------------------------- */
	void SystemEvolution::setNSteps(UInt nsteps) { this->nsteps = nsteps; }
	/* -------------------------------------------------------------------------- */
	void SystemEvolution::setDumpFreq(UInt freq) { this->freq = freq; }
	/* -------------------------------------------------------------------------- */
	System& SystemEvolution::getSystem() { return *system; }
	/* -------------------------------------------------------------------------- */