qwinregistry_p.h

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// Copyright (C) 2019 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 QWINREGISTRY_H
#define QWINREGISTRY_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtCore/qpair.h>
#include <QtCore/qstring.h>
#include <QtCore/qstringview.h>
#include <QtCore/qt_windows.h>
#include <QtCore/qvariant.h>
 
QT_BEGIN_NAMESPACE
 
class Q_CORE_EXPORT QWinRegistryKey
{
    Q_DISABLE_COPY(QWinRegistryKey)
 
public:
    QWinRegistryKey();
    explicit QWinRegistryKey(HKEY parentHandle, QStringView subKey,
                             REGSAM permissions = KEY_READ, REGSAM access = 0);
    ~QWinRegistryKey();
 
    QWinRegistryKey(QWinRegistryKey &&other) noexcept
        : m_key(std::exchange(other.m_key, nullptr)) {}
    QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QWinRegistryKey)
    void swap(QWinRegistryKey &other) noexcept { qSwap(m_key, other.m_key); }
 
    [[nodiscard]] bool isValid() const { return m_key != nullptr; }
 
    [[nodiscard]] HKEY handle() const { return m_key; }
 
    operator HKEY() const { return handle(); }
 
    void close();
 
    [[nodiscard]] QVariant value(QStringView subKey) const;
    template<typename T>
    [[nodiscard]] std::optional<T> value(QStringView subKey) const
    {
        const QVariant var = value(subKey);
        if (var.isValid())
            return qvariant_cast<T>(var);
        return std::nullopt;
    }
 
    // ### TODO: Remove once all usages are migrated to new interface.
    QString stringValue(QStringView subKey) const;
    std::pair<DWORD, bool> dwordValue(QStringView subKey) const;
 
private:
    HKEY m_key = nullptr;
};
 
QT_END_NAMESPACE
 
#endif // QWINREGISTRY_H