RefVectorBase.h

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#ifndef DataFormats_Common_RefVectorBase_h
#define DataFormats_Common_RefVectorBase_h

/*----------------------------------------------------------------------
  
RefVectorBase: Base class for a vector of interproduct references.


----------------------------------------------------------------------*/

#include "DataFormats/Common/interface/CMS_CLASS_VERSION.h"
#include "DataFormats/Common/interface/EDProductfwd.h"
#include "DataFormats/Common/interface/RefCore.h"
#include <vector>
#include "FWCore/Utilities/interface/GCC11Compatibility.h"

namespace edm {

  class EDProductGetter;

  class RefVectorMemberPointersHolder {
  public:
    RefVectorMemberPointersHolder() { }
    std::vector<void const*> const& memberPointers() const { return memberPointers_; }
    std::vector<void const*>& memberPointers() { return memberPointers_; }
  private:
    std::vector<void const*> memberPointers_;
  };

  template <typename KEY>
  class RefVectorBase {
  public:
    typedef std::vector<KEY > keys_type;
    typedef KEY key_type;
    typedef typename keys_type::size_type size_type;
    RefVectorBase() : product_(), keys_() {}
    RefVectorBase( RefVectorBase const & rhs) : product_(rhs.product_), keys_(rhs.keys_),
                                                memberPointersHolder_(rhs.memberPointersHolder_) {}
#if defined(__GXX_EXPERIMENTAL_CXX0X__)
    RefVectorBase( RefVectorBase && rhs)  noexcept : product_(std::move(rhs.product_)), keys_(std::move(rhs.keys_)),
                                                     memberPointersHolder_(std::move(rhs.memberPointersHolder_)) {}
#endif

    explicit RefVectorBase(ProductID const& productID, void const* prodPtr = 0,
                           EDProductGetter const* prodGetter = 0) :
      product_(productID, prodPtr, prodGetter, false), keys_() {}

    ~RefVectorBase() noexcept {}

    RefCore const& refCore() const {return product_;}

    void const* cachedMemberPointer(size_type idx) const {
      return memberPointers().empty() ? nullptr : memberPointers()[idx];
    }

    keys_type const& keys() const {return keys_;}

    bool empty() const {return keys_.empty();}

    size_type size() const {return keys_.size();}

    void pushBack(RefCore const& product, KEY const& key) {
      product_.pushBackRefItem(product);
      if(product.productPtr() != nullptr) {
        if(memberPointers().empty()) {
          memberPointersHolder_.memberPointers().resize(keys_.size(), nullptr);
        }
        memberPointersHolder_.memberPointers().push_back(product.productPtr());
        keys_.push_back(key);
        return;
      } else {
        if(!memberPointers().empty()) {
          memberPointersHolder_.memberPointers().push_back(nullptr);
        }
        keys_.push_back(key);
      }
    }

    size_type capacity() const {return keys_.capacity();}

    void reserve(size_type n) {keys_.reserve(n);}

    typename keys_type::iterator eraseAtIndex(size_type index) {
      memberPointersHolder_.memberPointers().erase(memberPointersHolder_.memberPointers().begin() + index);
      return keys_.erase(keys_.begin() + index);
    }
    
    void clear() {
      keys_.clear();
      memberPointersHolder_.memberPointers().clear();
      product_ = RefCore();
    }

    void swap(RefVectorBase<KEY> & other)  noexcept {
      product_.swap(other.product_);
      keys_.swap(other.keys_);
      memberPointersHolder_.memberPointers().swap(other.memberPointersHolder_.memberPointers());
    }

    RefVectorBase& operator=(RefVectorBase const& rhs) {
      RefVectorBase temp(rhs);
      this->swap(temp);
      return *this;
    }
#if defined(__GXX_EXPERIMENTAL_CXX0X__)
    RefVectorBase& operator=(RefVectorBase && rhs)  noexcept {
      product_ = std::move(rhs.product_); 
      keys_ =std::move(rhs.keys_);
      memberPointersHolder_ = std::move(rhs.memberPointersHolder_);
      return *this;
    }
#endif

    //Needed for ROOT storage
    CMS_CLASS_VERSION(13)

  private:

    std::vector<void const*> const& memberPointers() const { return memberPointersHolder_.memberPointers(); }

    RefCore product_;
    keys_type keys_;
    RefVectorMemberPointersHolder memberPointersHolder_;
  };

  template<typename KEY>
  bool
  operator==(RefVectorBase<KEY> const& lhs, RefVectorBase<KEY> const& rhs) {
    return lhs.refCore() == rhs.refCore() && lhs.keys() == rhs.keys();
  }

  template<typename KEY>
  bool
  operator!=(RefVectorBase<KEY> const& lhs, RefVectorBase<KEY> const& rhs) {
    return !(lhs == rhs);
  }

  template<typename KEY>
  inline
  void
  swap(RefVectorBase<KEY> & a, RefVectorBase<KEY> & b) {
    a.swap(b);
  }

}
#endif