SimpleDerivedProducer_module.cc

Go to the documentation of this file.

// ======================================================================
//
// SimpleDerivedProducer
//
// ======================================================================

#include "art/Framework/Core/EDProducer.h"
#include "art/Framework/Core/ModuleMacros.h"
#include "art/Framework/Principal/Event.h"
#include "art/test/TestObjects/ToyProducts.h"
#include "fhiclcpp/ParameterSet.h"

#include <memory>
#include <vector>

namespace arttest {
  class SimpleDerivedProducer;
}

using arttest::SimpleDerivedProducer;

//--------------------------------------------------------------------
//
// Produces a SimpleProduct product instance.
//
class arttest::SimpleDerivedProducer : public art::EDProducer {
public:
  using SimpleDerivedProduct = std::vector<arttest::SimpleDerived>;

  explicit SimpleDerivedProducer(fhicl::ParameterSet const& p)
    : EDProducer{p}, size_(p.get<int>("nvalues"))
  {
    produces<SimpleDerivedProduct>("derived");
  }

private:
  void produce(art::Event& e) override;

  int const size_; // number of Simples to put in the collection
};

void
SimpleDerivedProducer::produce(art::Event& e)
{
  // Fill up a collection of SimpleDerived objects
  auto prod = std::make_unique<SimpleDerivedProduct>();
  int event_num = e.id().event();
  for (int i = 0; i != size_; ++i) {
    SimpleDerived sd;
    sd.key = size_ - i + event_num;
    sd.value = 1.5 * i + 100.0;
    // sd.dummy_ = default-constructed value
    prod->push_back(sd);
  }

  // Put the product into the Event
  e.put(std::move(prod), "derived");
}

// ----------------------------------------------------------------------

DEFINE_ART_MODULE(SimpleDerivedProducer)

// ======================================================================