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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef AUTODECREF_H
#define AUTODECREF_H
#include "sbkpython.h"
#include <utility>
struct SbkObject;
namespace Shiboken
{
/**
* AutoDecRef holds a PyObject pointer and decrement its reference counter when destroyed.
*/
struct AutoDecRef
{
public:
AutoDecRef(const AutoDecRef &) = delete;
AutoDecRef(AutoDecRef &&o) noexcept : m_pyObj{std::exchange(o.m_pyObj, nullptr)} {}
AutoDecRef &operator=(const AutoDecRef &) = delete;
AutoDecRef &operator=(AutoDecRef &&o) noexcept
{
m_pyObj = std::exchange(o.m_pyObj, nullptr);
return *this;
}
/// AutoDecRef constructor.
/// \param pyobj A borrowed reference to a Python object
explicit AutoDecRef(PyObject *pyObj) noexcept : m_pyObj(pyObj) {}
/// AutoDecRef constructor.
/// \param pyobj A borrowed reference to a wrapped Python object
explicit AutoDecRef(SbkObject *pyObj) noexcept : m_pyObj(reinterpret_cast<PyObject *>(pyObj)) {}
/// AutoDecref default constructor.
/// To be used later with reset():
AutoDecRef() noexcept = default;
/// Decref the borrowed python reference
~AutoDecRef()
{
Py_XDECREF(m_pyObj);
}
[[nodiscard]] bool isNull() const { return m_pyObj == nullptr; }
/// Returns the pointer of the Python object being held.
[[nodiscard]] PyObject *object() const { return m_pyObj; }
[[nodiscard]] operator PyObject *() const { return m_pyObj; }
operator bool() const { return m_pyObj != nullptr; }
PyObject *operator->() { return m_pyObj; }
template<typename T>
[[deprecated]] T cast()
{
return reinterpret_cast<T>(m_pyObj);
}
/**
* Decref the current borrowed python reference and borrow \p other.
*/
void reset(PyObject *other)
{
// Safely decref m_pyObj. See Py_XSETREF in object.h .
PyObject *_py_tmp = m_pyObj;
m_pyObj = other;
Py_XDECREF(_py_tmp);
}
PyObject *release()
{
PyObject *result = m_pyObj;
m_pyObj = nullptr;
return result;
}
private:
PyObject *m_pyObj = nullptr;
};
} // namespace Shiboken
#endif // AUTODECREF_H
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