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

	#include <cassert>

	#include "LHEF/LHEF.h"

	#ifdef HEJ_BUILD_WITH_HepMC2

	#include "HepMC/IO_GenEvent.h"

	#include <utility>

	#include "HepMC/GenParticle.h"
	#include "HepMC/GenVertex.h"

	#include "HEJ/Event.hh"
	#include "HEJ/exceptions.hh"
	#include "HEJ/HepMC2Interface.hh"

	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;
	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);
	}
	};

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

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

	#else // no HepMC2

	namespace HEJ{

	class HepMC2Writer::HepMC2WriterImpl{};

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

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

	}
	#endif

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