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#ifndef DataFormats_Common_interface_OrphanHandleBase_h
#define DataFormats_Common_interface_OrphanHandleBase_h
/*----------------------------------------------------------------------
OrphanHandle: Non-owning "smart pointer" for reference to EDProducts.
This is a very preliminary version, and lacks safety features and
elegance.
If the pointed-to WrapperBase is destroyed, use of the OrphanHandle
becomes undefined. There is no way to query the OrphanHandle to
discover if this has happened.
OrphanHandles can have:
-- Product pointer null and id == 0;
-- Product pointer valid and id != 0;
To check validity, one can use the isValid() function.
----------------------------------------------------------------------*/
#include <algorithm>
#include <cassert>
#include "DataFormats/Provenance/interface/ProductID.h"
namespace edm {
class OrphanHandleBase {
public:
OrphanHandleBase() : product_(nullptr), id_() {}
OrphanHandleBase(void const* iProd, ProductID const& iId) : product_(iProd), id_(iId) { assert(iProd); }
void clear() {
product_ = nullptr;
id_ = ProductID();
}
void swap(OrphanHandleBase& other) {
std::swap(product_, other.product_);
std::swap(id_, other.id_);
}
bool isValid() const { return product_ && id_ != ProductID(); }
ProductID id() const { return id_; }
protected:
void const* productStorage() const { return product_; }
private:
void const* product_;
ProductID id_;
};
// Free swap function
inline void swap(OrphanHandleBase& a, OrphanHandleBase& b) { a.swap(b); }
} // namespace edm
#endif // DataFormats_Common_interface_OrphanHandleBase_h
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