HepMC3Writer.cc
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HepMC3Writer.cc
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	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include "HEJ/HepMC3Writer.hh"

	#include <cassert>

	#include "LHEF/LHEF.h"

	#include "HEJ/exceptions.hh"

	#ifdef HEJ_BUILD_WITH_HepMC3

	#include "HepMC3/WriterAscii.h"

	#include <utility>

	#include "HEJ/Event.hh"
	#include "HEJ/HepMC3Interface.hh"

	namespace HEJ{

	struct HepMC3Writer::HepMC3WriterImpl{
	HepMC3Interface HepMC3_;

	HepMC3WriterImpl & operator=(HepMC3WriterImpl const & other) = delete;
	HepMC3WriterImpl(HepMC3WriterImpl const & other) = delete;
	HepMC3WriterImpl & operator=(HepMC3WriterImpl && other) = delete;
	HepMC3WriterImpl(HepMC3WriterImpl && other) = delete;

	std::unique_ptr<HepMC3::WriterAscii> writer_;
	std::string const file_;

	HepMC3WriterImpl(
	std::string const & file, LHEF::HEPRUP && heprup
	):
	HepMC3_{std::move(heprup)},
	file_{file}
	{}

	void init_writer(){
	writer_ = std::make_unique<HepMC3::WriterAscii>(file_, HepMC3_.run_info);
	}

	~HepMC3WriterImpl(){
	if(!writer_) // make sure that we always write something
	init_writer();
	writer_->close();
	}

	void write(Event const & ev){
	auto out_ev = HepMC3_(ev);
	//! weight names are only available after first event
	if(!writer_)
	init_writer();
	writer_->write_event(out_ev);
	}
	};

	HepMC3Writer::HepMC3Writer(std::string const & file, LHEF::HEPRUP heprup):
	impl_{ std::make_unique<HepMC3WriterImpl>(file, std::move(heprup)) }
	{}

	void HepMC3Writer::write(Event const & ev){
	impl_->write(ev);
	}
	} // namespace HEJ

	#else // no HepMC3

	namespace HEJ{

	class HepMC3Writer::HepMC3WriterImpl{};

	HepMC3Writer::HepMC3Writer(std::string const &, LHEF::HEPRUP){
	throw std::invalid_argument(
	"Failed to create HepMC3 writer: "
	"HEJ 2 was built without HepMC3 support"
	);
	}

	void HepMC3Writer::write(Event const &){
	assert(false);
	}

	}
	#endif

	namespace HEJ{
	HepMC3Writer::~HepMC3Writer() = default;
	}

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