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// Copyright (C) 2017 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 QWINDOWSCOMBASE_H
#define QWINDOWSCOMBASE_H
#include <qt_windows.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;
}
// 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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