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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 QSCOPEDPOINTER_H
#define QSCOPEDPOINTER_H
#include <QtCore/qglobal.h>
#include <stdlib.h>
QT_BEGIN_NAMESPACE
template <typename T>
struct QScopedPointerDeleter
{
static inline void cleanup(T *pointer) noexcept
{
// Enforce a complete type.
// If you get a compile error here, read the section on forward declared
// classes in the QScopedPointer documentation.
typedef char IsIncompleteType[ sizeof(T) ? 1 : -1 ];
(void) sizeof(IsIncompleteType);
delete pointer;
}
void operator()(T *pointer) const noexcept
{
cleanup(pointer);
}
};
template <typename T>
struct QScopedPointerArrayDeleter
{
static inline void cleanup(T *pointer) noexcept
{
// Enforce a complete type.
// If you get a compile error here, read the section on forward declared
// classes in the QScopedPointer documentation.
typedef char IsIncompleteType[ sizeof(T) ? 1 : -1 ];
(void) sizeof(IsIncompleteType);
delete[] pointer;
}
void operator()(T *pointer) const noexcept
{
cleanup(pointer);
}
};
struct QScopedPointerPodDeleter
{
static inline void cleanup(void *pointer) noexcept { free(pointer); }
void operator()(void *pointer) const noexcept { cleanup(pointer); }
};
#ifndef QT_NO_QOBJECT
template <typename T>
struct QScopedPointerObjectDeleteLater
{
static inline void cleanup(T *pointer) { if (pointer) pointer->deleteLater(); }
void operator()(T *pointer) const { cleanup(pointer); }
};
class QObject;
typedef QScopedPointerObjectDeleteLater<QObject> QScopedPointerDeleteLater;
#endif
template <typename T, typename Cleanup = QScopedPointerDeleter<T> >
class [[nodiscard]] QScopedPointer
{
public:
explicit QScopedPointer(T *p = nullptr) noexcept : d(p)
{
}
inline ~QScopedPointer()
{
T *oldD = this->d;
Cleanup::cleanup(oldD);
}
inline T &operator*() const
{
Q_ASSERT(d);
return *d;
}
T *operator->() const noexcept
{
return d;
}
bool operator!() const noexcept
{
return !d;
}
explicit operator bool() const
{
return !isNull();
}
T *data() const noexcept
{
return d;
}
T *get() const noexcept
{
return d;
}
bool isNull() const noexcept
{
return !d;
}
void reset(T *other = nullptr) noexcept(noexcept(Cleanup::cleanup(std::declval<T *>())))
{
if (d == other)
return;
T *oldD = qExchange(d, other);
Cleanup::cleanup(oldD);
}
#if QT_DEPRECATED_SINCE(6, 1)
QT_DEPRECATED_VERSION_X_6_1("Use std::unique_ptr instead, and call release().")
T *take() noexcept
{
T *oldD = qExchange(d, nullptr);
return oldD;
}
#endif
#if QT_DEPRECATED_SINCE(6, 2)
QT_DEPRECATED_VERSION_X_6_2("Use std::unique_ptr instead of QScopedPointer.")
void swap(QScopedPointer<T, Cleanup> &other) noexcept
{
qt_ptr_swap(d, other.d);
}
#endif
typedef T *pointer;
friend bool operator==(const QScopedPointer<T, Cleanup> &lhs, const QScopedPointer<T, Cleanup> &rhs) noexcept
{
return lhs.data() == rhs.data();
}
friend bool operator!=(const QScopedPointer<T, Cleanup> &lhs, const QScopedPointer<T, Cleanup> &rhs) noexcept
{
return lhs.data() != rhs.data();
}
friend bool operator==(const QScopedPointer<T, Cleanup> &lhs, std::nullptr_t) noexcept
{
return lhs.isNull();
}
friend bool operator==(std::nullptr_t, const QScopedPointer<T, Cleanup> &rhs) noexcept
{
return rhs.isNull();
}
friend bool operator!=(const QScopedPointer<T, Cleanup> &lhs, std::nullptr_t) noexcept
{
return !lhs.isNull();
}
friend bool operator!=(std::nullptr_t, const QScopedPointer<T, Cleanup> &rhs) noexcept
{
return !rhs.isNull();
}
#if QT_DEPRECATED_SINCE(6, 2)
QT_DEPRECATED_VERSION_X_6_2("Use std::unique_ptr instead of QScopedPointer.")
friend void swap(QScopedPointer<T, Cleanup> &p1, QScopedPointer<T, Cleanup> &p2) noexcept
{ p1.swap(p2); }
#endif
protected:
T *d;
private:
Q_DISABLE_COPY_MOVE(QScopedPointer)
};
template <typename T, typename Cleanup = QScopedPointerArrayDeleter<T> >
class [[nodiscard]] QScopedArrayPointer : public QScopedPointer<T, Cleanup>
{
template <typename Ptr>
using if_same_type = typename std::enable_if<std::is_same<typename std::remove_cv<T>::type, Ptr>::value, bool>::type;
public:
inline QScopedArrayPointer() : QScopedPointer<T, Cleanup>(nullptr) {}
inline ~QScopedArrayPointer() = default;
template <typename D, if_same_type<D> = true>
explicit QScopedArrayPointer(D *p)
: QScopedPointer<T, Cleanup>(p)
{
}
inline T &operator[](int i)
{
return this->d[i];
}
inline const T &operator[](int i) const
{
return this->d[i];
}
#if QT_DEPRECATED_SINCE(6, 2)
QT_DEPRECATED_VERSION_X_6_2("Use std::unique_ptr instead of QScopedArrayPointer.")
void swap(QScopedArrayPointer &other) noexcept // prevent QScopedPointer <->QScopedArrayPointer swaps
{ QScopedPointer<T, Cleanup>::swap(other); }
#endif
private:
explicit inline QScopedArrayPointer(void *)
{
// Enforce the same type.
// If you get a compile error here, make sure you declare
// QScopedArrayPointer with the same template type as you pass to the
// constructor. See also the QScopedPointer documentation.
// Storing a scalar array as a pointer to a different type is not
// allowed and results in undefined behavior.
}
Q_DISABLE_COPY_MOVE(QScopedArrayPointer)
};
#if QT_DEPRECATED_SINCE(6, 2)
template <typename T, typename Cleanup>
QT_DEPRECATED_VERSION_X_6_2("Use std::unique_ptr instead of QScopedArrayPointer.")
inline void swap(QScopedArrayPointer<T, Cleanup> &lhs, QScopedArrayPointer<T, Cleanup> &rhs) noexcept
{ lhs.swap(rhs); }
#endif
QT_END_NAMESPACE
#endif // QSCOPEDPOINTER_H
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