WeakPtr.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2012 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
/*
 
  This file declares the get_pointer template function to allow
  boost python to understand weak_pointers. It must be add to the
  boost namespace
*/
#include <memory>
#include <stdexcept>
 
namespace std {
template <typename HeldType> inline HeldType *get_pointer(const std::weak_ptr<HeldType> &dataItem) {
  if (std::shared_ptr<HeldType> lockedItem = dataItem.lock()) {
    return lockedItem.get(); // Safe as we can guarantee that another reference exists
  } else {
    throw std::runtime_error("Variable invalidated, data has been deleted.");
  }
}
} // namespace std