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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QWINDOWSCOMBASE_H
#define QWINDOWSCOMBASE_H
#include <QtCore/qglobal.h>
#include <unknwn.h>
QT_BEGIN_NAMESPACE
// The __uuidof operator of MinGW does not work for all interfaces (for example,
// IAccessible2). Specializations of this function can be provides to work
// around this.
template <class DesiredInterface>
static IID qUuidOf() { return __uuidof(DesiredInterface); }
// Helper for implementing IUnknown::QueryInterface.
template <class DesiredInterface, class Derived>
bool qWindowsComQueryInterface(Derived *d, REFIID id, LPVOID *iface)
{
if (id == qUuidOf<DesiredInterface>()) {
*iface = static_cast<DesiredInterface *>(d);
d->AddRef();
return true;
}
return false;
}
// Helper for implementing IUnknown::QueryInterface for IUnknown
// in the case of multiple inheritance via the first inherited class.
template <class FirstInheritedInterface, class Derived>
bool qWindowsComQueryUnknownInterfaceMulti(Derived *d, REFIID id, LPVOID *iface)
{
if (id == __uuidof(IUnknown)) {
*iface = static_cast<FirstInheritedInterface *>(d);
d->AddRef();
return true;
}
return false;
}
// Helper base class to provide IUnknown methods for COM classes (single inheritance)
template <class ComInterface> class QWindowsComBase : public ComInterface
{
Q_DISABLE_COPY_MOVE(QWindowsComBase)
public:
explicit QWindowsComBase(ULONG initialRefCount = 1) : m_ref(initialRefCount) {}
virtual ~QWindowsComBase() = default;
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID id, LPVOID *iface) override
{
*iface = nullptr;
return qWindowsComQueryInterface<IUnknown>(this, id, iface) || qWindowsComQueryInterface<ComInterface>(this, id, iface)
? S_OK : E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE AddRef() override { return ++m_ref; }
ULONG STDMETHODCALLTYPE Release() override
{
if (!--m_ref) {
delete this;
return 0;
}
return m_ref;
}
private:
ULONG m_ref;
};
// Clang does not consider __declspec(nothrow) as nothrow
QT_WARNING_DISABLE_CLANG("-Wmicrosoft-exception-spec")
QT_WARNING_DISABLE_CLANG("-Wmissing-exception-spec")
QT_END_NAMESPACE
#endif // QWINDOWSCOMBASE_H
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