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#ifndef DataFormats_Common_IndirectHolder_h
#define DataFormats_Common_IndirectHolder_h
#include "DataFormats/Common/interface/CMS_CLASS_VERSION.h"
#include "DataFormats/Common/interface/BaseHolder.h"
#include "DataFormats/Common/interface/RefHolderBase.h"
#include "DataFormats/Provenance/interface/ProductID.h"
#include <memory>
namespace edm {
template <typename T>
class RefToBase;
namespace reftobase {
template <typename T>
class IndirectVectorHolder;
class RefVectorHolderBase;
class RefHolderBase;
//------------------------------------------------------------------
// Class template IndirectHolder<T>
//------------------------------------------------------------------
template <typename T>
class IndirectHolder : public BaseHolder<T> {
public:
// It may be better to use unique_ptr<RefHolderBase> in
// this constructor, so that the cloning can be avoided. I'm not
// sure if use of unique_ptr here causes any troubles elsewhere.
IndirectHolder() : BaseHolder<T>(), helper_(nullptr) {}
IndirectHolder(std::shared_ptr<RefHolderBase> p);
template <typename U>
IndirectHolder(std::unique_ptr<U> p) : helper_(p.release()) {}
IndirectHolder(IndirectHolder const& other);
IndirectHolder& operator=(IndirectHolder const& rhs);
void swap(IndirectHolder& other);
~IndirectHolder() override;
BaseHolder<T>* clone() const override;
T const* getPtr() const override;
ProductID id() const override;
size_t key() const override;
bool isEqualTo(BaseHolder<T> const& rhs) const override;
std::unique_ptr<RefHolderBase> holder() const override;
std::unique_ptr<BaseVectorHolder<T> > makeVectorHolder() const override;
EDProductGetter const* productGetter() const override;
/// Checks if product collection is in memory or available
/// in the Event. No type checking is done.
bool isAvailable() const override { return helper_->isAvailable(); }
bool isTransient() const override { return helper_->isTransient(); }
//Used by ROOT storage
CMS_CLASS_VERSION(10)
private:
friend class RefToBase<T>;
friend class IndirectVectorHolder<T>;
RefHolderBase* helper_;
};
//------------------------------------------------------------------
// Implementation of IndirectHolder<T>
//------------------------------------------------------------------
template <typename T>
inline IndirectHolder<T>::IndirectHolder(std::shared_ptr<RefHolderBase> p) : BaseHolder<T>(), helper_(p->clone()) {}
template <typename T>
inline IndirectHolder<T>::IndirectHolder(IndirectHolder const& other)
: BaseHolder<T>(other), helper_(other.helper_->clone()) {}
template <typename T>
inline void IndirectHolder<T>::swap(IndirectHolder& other) {
this->BaseHolder<T>::swap(other);
std::swap(helper_, other.helper_);
}
template <typename T>
inline IndirectHolder<T>& IndirectHolder<T>::operator=(IndirectHolder const& rhs) {
IndirectHolder temp(rhs);
swap(temp);
return *this;
}
template <typename T>
IndirectHolder<T>::~IndirectHolder() {
delete helper_;
}
template <typename T>
BaseHolder<T>* IndirectHolder<T>::clone() const {
return new IndirectHolder<T>(*this);
}
template <typename T>
T const* IndirectHolder<T>::getPtr() const {
return helper_->template getPtr<T>();
}
template <typename T>
ProductID IndirectHolder<T>::id() const {
return helper_->id();
}
template <typename T>
size_t IndirectHolder<T>::key() const {
return helper_->key();
}
template <typename T>
inline EDProductGetter const* IndirectHolder<T>::productGetter() const {
return helper_->productGetter();
}
template <typename T>
bool IndirectHolder<T>::isEqualTo(BaseHolder<T> const& rhs) const {
IndirectHolder const* h = dynamic_cast<IndirectHolder const*>(&rhs);
return h && helper_->isEqualTo(*h->helper_);
}
template <typename T>
std::unique_ptr<RefHolderBase> IndirectHolder<T>::holder() const {
return std::unique_ptr<RefHolderBase>(helper_->clone());
}
// Free swap function
template <typename T>
inline void swap(IndirectHolder<T>& lhs, IndirectHolder<T>& rhs) {
lhs.swap(rhs);
}
} // namespace reftobase
} // namespace edm
#include "DataFormats/Common/interface/IndirectVectorHolder.h"
#include "DataFormats/Common/interface/RefVectorHolderBase.h"
namespace edm {
namespace reftobase {
template <typename T>
std::unique_ptr<BaseVectorHolder<T> > IndirectHolder<T>::makeVectorHolder() const {
std::unique_ptr<RefVectorHolderBase> p = helper_->makeVectorHolder();
std::shared_ptr<RefVectorHolderBase> sp(p.release());
return std::unique_ptr<BaseVectorHolder<T> >(new IndirectVectorHolder<T>(sp));
}
} // namespace reftobase
} // namespace edm
#endif
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