/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/SimDataFormats/GeneratorProducts/src/LHEEventProduct.cc

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#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>

#include "SimDataFormats/GeneratorProducts/interface/LesHouches.h"
#include "SimDataFormats/GeneratorProducts/interface/LHEEventProduct.h"

void LHEEventProduct::const_iterator::next()
{
        const lhef::HEPEUP &hepeup = event->hepeup();
        int line = this->line++;

        if (!line) {
                std::ostringstream ss;
                ss << std::setprecision(7)
                   << std::scientific
                   << std::uppercase
                   << "    " << hepeup.NUP
                   << "  " << hepeup.IDPRUP
                   << "  " << hepeup.XWGTUP
                   << "  " << hepeup.SCALUP
                   << "  " << hepeup.AQEDUP
                   << "  " << hepeup.AQCDUP << std::endl;
                tmp = ss.str();
                return;
        }
        line--;

        if (line < hepeup.NUP) {
                std::ostringstream ss;
                ss << std::setprecision(10)
                   << std::scientific
                   << std::uppercase
                   << "\t" << hepeup.IDUP[line]
                   << "\t" << hepeup.ISTUP[line]
                   << "\t" << hepeup.MOTHUP[line].first
                   << "\t" << hepeup.MOTHUP[line].second
                   << "\t" << hepeup.ICOLUP[line].first
                   << "\t" << hepeup.ICOLUP[line].second
                   << "\t" << hepeup.PUP[line][0]
                   << "\t" << hepeup.PUP[line][1]
                   << "\t" << hepeup.PUP[line][2]
                   << "\t" << hepeup.PUP[line][3]
                   << "\t" << hepeup.PUP[line][4]
                   << std::setprecision(3)
                   << "\t" << hepeup.VTIMUP[line]
                   << std::setprecision(1)
                   << std::fixed
                   << "\t" << hepeup.SPINUP[line] << std::endl;
                tmp = ss.str();
                return;
        }
        line -= hepeup.NUP;

        if (event->pdf()) {
                if (!line) {
                        const PDF &pdf = *event->pdf();
                        std::ostringstream ss;
                        ss << std::setprecision(7)
                           << std::scientific
                           << std::uppercase
                           << "#pdf  " << pdf.id.first
                           << "  " << pdf.id.second
                           << "  " << pdf.x.first
                           << "  " << pdf.x.second
                           << "  " << pdf.scalePDF
                           << "  " << pdf.xPDF.first
                           << "  " << pdf.xPDF.second << std::endl;
                        tmp = ss.str();
                        return;
                }
                line--;
        }

        if (line < (int)event->comments_size()) {
                tmp = *(event->comments_begin() + line);
                return;
        }
        line -= event->comments_size();

        if (!line) {
                tmp = "</event>\n";
                return;
        }

        tmp.clear();
        this->line = npos;
}

LHEEventProduct::const_iterator LHEEventProduct::begin() const
{
        const_iterator result;
        result.event = this;
        result.line = 0;
        result.tmp = "<event>\n";
        return result;
}