setPtr.h

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#ifndef DataFormats_Common_setPtr_h
#define DataFormats_Common_setPtr_h
// -*- C++ -*-
//
// Package:     Common
// Class  :     setPtr
//
//
// Original Author:  Chris Jones
//         Created:  Sat Oct 20 11:45:38 CEST 2007
//

// user include files
#include "DataFormats/Common/interface/FillView.h"
#include "DataFormats/Common/interface/fwd_setPtr.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include "FWCore/Utilities/interface/OffsetToBase.h"

// system include files
#include <typeinfo>
#include <vector>

// forward declarations
namespace edm {
  namespace detail {

    template <typename COLLECTION>
    void reallySetPtr(COLLECTION const& coll, std::type_info const& iToType, unsigned long iIndex, void const*& oPtr) {
      typedef COLLECTION product_type;
      typedef typename GetProduct<product_type>::element_type element_type;
      typedef typename product_type::const_iterator iter;

      if (iToType == typeid(element_type)) {
        iter it = coll.begin();
        std::advance(it, iIndex);
        element_type const* address = GetProduct<product_type>::address(it);
        oPtr = address;
      } else {
        iter it = coll.begin();
        std::advance(it, iIndex);
        element_type const* address = GetProduct<product_type>::address(it);

        oPtr = pointerToBase(iToType, address);

        if (nullptr == oPtr) {
          Exception::throwThis(errors::LogicError,
                               "TypeConversionError"
                               "edm::Ptr<> : unable to convert type ",
                               typeid(element_type).name(),
                               " to ",
                               iToType.name(),
                               "\n");
        }
      }
    }
  }  // namespace detail

  template <typename T, typename A>
  void setPtr(std::vector<T, A> const& obj, std::type_info const& iToType, unsigned long iIndex, void const*& oPtr) {
    detail::reallySetPtr(obj, iToType, iIndex, oPtr);
  }

  template <typename T, typename A>
  void setPtr(std::list<T, A> const& obj, std::type_info const& iToType, unsigned long iIndex, void const*& oPtr) {
    detail::reallySetPtr(obj, iToType, iIndex, oPtr);
  }

  template <typename T, typename A>
  void setPtr(std::deque<T, A> const& obj, std::type_info const& iToType, unsigned long iIndex, void const*& oPtr) {
    detail::reallySetPtr(obj, iToType, iIndex, oPtr);
  }

  template <typename T, typename A, typename Comp>
  void setPtr(std::set<T, A, Comp> const& obj, std::type_info const& iToType, unsigned long iIndex, void const*& oPtr) {
    detail::reallySetPtr(obj, iToType, iIndex, oPtr);
  }

}  // namespace edm

#endif