/data/refman/pasoursint/CMSSW_5_3_1/src/SimDataFormats/GeneratorProducts/src/GenEventInfoProduct.cc

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#include <functional>
#include <numeric>
using std::ptrdiff_t;

#include <HepMC/GenEvent.h>
#include <HepMC/WeightContainer.h>
#include <HepMC/PdfInfo.h>

#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "SimDataFormats/GeneratorProducts/interface/GenEventInfoProduct.h"

using namespace edm;
using namespace std;

GenEventInfoProduct::GenEventInfoProduct() :
        signalProcessID_(0), qScale_(-1.), alphaQCD_(-1.), alphaQED_(-1.)
{
}

GenEventInfoProduct::GenEventInfoProduct(const HepMC::GenEvent *evt) :
        weights_(evt->weights().begin(), evt->weights().end()),
        signalProcessID_(evt->signal_process_id()),
        qScale_(evt->event_scale()),
        alphaQCD_(evt->alphaQCD()),
        alphaQED_(evt->alphaQED())
{
        const HepMC::PdfInfo *hepPDF = evt->pdf_info();    
        if (hepPDF) {
                PDF pdf;

                pdf.id = std::make_pair(hepPDF->id1(), hepPDF->id2());
                pdf.x = std::make_pair(hepPDF->x1(), hepPDF->x2());
                pdf.xPDF = std::make_pair(hepPDF->pdf1(), hepPDF->pdf2());   
                pdf.scalePDF = hepPDF->scalePDF();

                setPDF(&pdf);
        }
}

GenEventInfoProduct::GenEventInfoProduct(GenEventInfoProduct const &other) :
        weights_(other.weights_),
        signalProcessID_(other.signalProcessID_),
        qScale_(other.qScale_),
        alphaQCD_(other.alphaQCD_),
        alphaQED_(other.alphaQED_),
        binningValues_(other.binningValues_)
{
        setPDF(other.pdf());
}

GenEventInfoProduct::~GenEventInfoProduct()
{
}

GenEventInfoProduct &GenEventInfoProduct::operator = (GenEventInfoProduct const &other)
{
        weights_ = other.weights_;
        signalProcessID_ = other.signalProcessID_;
        qScale_ = other.qScale_;
        alphaQCD_ = other.alphaQCD_;
        alphaQED_ = other.alphaQED_;
        binningValues_ = other.binningValues_;

        setPDF(other.pdf());

        return *this;
}

double GenEventInfoProduct::weight() const
{
        return std::accumulate(weights_.begin(), weights_.end(),
                               1., std::multiplies<double>());
}