Sip.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 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
 
#include "MantidQtWidgets/Common/DllOption.h"
#include "MantidQtWidgets/Common/Python/Object.h"
#include <sip.h>
#include <stdexcept>
 
namespace MantidQt {
namespace Widgets {
namespace Common {
namespace Python {
 
namespace Detail {
EXPORT_OPT_MANTIDQT_COMMON const sipAPIDef *sipAPI();
} // namespace Detail
 
template <typename T> T *extract(const Object &obj) {
  const auto sipapi = Detail::sipAPI();
  if (!PyObject_TypeCheck(obj.ptr(), sipapi->api_wrapper_type)) {
    throw std::runtime_error("extract() - Object is not a sip-wrapped type.");
  }
  // transfer ownership from python to C++
  sipapi->api_transfer_to(obj.ptr(), 0);
  // reinterpret to sipWrapper
  auto wrapper = reinterpret_cast<sipSimpleWrapper *>(obj.ptr());
#if (SIP_API_MAJOR_NR == 8 && SIP_API_MINOR_NR >= 1) || SIP_API_MAJOR_NR > 8
  return static_cast<T *>(sipapi->api_get_address(wrapper));
#elif SIP_API_MAJOR_NR == 8
  return static_cast<T *>(wrapper->data);
#else
  return static_cast<T *>(wrapper->u.cppPtr);
#endif
}
 
} // namespace Python
} // namespace Common
} // namespace Widgets
 
} // namespace MantidQt