HepMC2Writer.cc
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HepMC2Writer.cc
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	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019-2020
	* \copyright GPLv2 or later
	*/
	#include "HEJ/HepMC2Writer.hh"

	#include "LHEF/LHEF.h"

	#include "HEJ/ConfigFlags.hh"

	#ifdef HEJ_BUILD_WITH_HepMC2

	#include <utility>

	#include "HepMC/IO_GenEvent.h"

	#include "HEJ/HepMC2Interface.hh"

	#else

	#include <cassert>

	#include "HEJ/exceptions.hh"

	#endif

	#ifdef HEJ_BUILD_WITH_HepMC2

	namespace HEJ {

	struct HepMC2Writer::HepMC2WriterImpl{
	HepMC2Interface hepmc_;

	HepMC2WriterImpl & operator=(HepMC2WriterImpl const & other) = delete;
	HepMC2WriterImpl(HepMC2WriterImpl const & other) = delete;
	HepMC2WriterImpl & operator=(HepMC2WriterImpl && other) = delete;
	HepMC2WriterImpl(HepMC2WriterImpl && other) = delete;
	~HepMC2WriterImpl() = default;
	HepMC::IO_GenEvent writer_;

	HepMC2WriterImpl(
	std::string const & file, LHEF::HEPRUP && heprup
	):
	hepmc_(heprup),
	writer_{file}
	{}

	void write(Event const & ev){
	auto out_ev = hepmc_(ev);
	writer_.write_event(&out_ev);
	}

	void set_xs_scale(const double scale) {
	hepmc_.set_xs_scale(scale);
	}

	};

	HepMC2Writer::HepMC2Writer(std::string const & file, LHEF::HEPRUP heprup):
	impl_{std::make_unique<HepMC2WriterImpl>(file, std::move(heprup))}
	{}

	void HepMC2Writer::set_xs_scale(const double scale) {
	impl_->set_xs_scale(scale);
	}

	void HepMC2Writer::write(Event const & ev){
	impl_->write(ev);
	}
	} // namespace HEJ

	#else // no HepMC2

	namespace HEJ {

	struct HepMC2Writer::HepMC2WriterImpl{};

	HepMC2Writer::HepMC2Writer(
	std::string const & /file/, LHEF::HEPRUP /heprup/
	){
	throw std::invalid_argument(
	"Failed to create HepMC writer: "
	"HEJ 2 was built without HepMC2 support"
	);
	}

	void HepMC2Writer::write(Event const & /ev/){
	assert(false);
	}

	void HepMC2Writer::set_xs_scale(double /* scale */) {
	assert(false);
	}

	}
	#endif

	namespace HEJ {
	HepMC2Writer::~HepMC2Writer() = default;
	}

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