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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include "extensionsystem_global.h"
#include <QMetaMethod>
#include <QMetaObject>
#include <QMetaType>
#include <QVarLengthArray>
namespace ExtensionSystem {
class EXTENSIONSYSTEM_EXPORT InvokerBase
{
public:
InvokerBase();
~InvokerBase();
bool wasSuccessful() const;
void setConnectionType(Qt::ConnectionType connectionType);
template <class T> void addArgument(const T &t)
{
arg[lastArg++] = QGenericArgument(typeName<T>(), &t);
}
template <class T> void setReturnValue(T &t)
{
useRet = true;
ret = QGenericReturnArgument(typeName<T>(), &t);
}
void invoke(QObject *target, const char *slot);
private:
InvokerBase(const InvokerBase &); // Unimplemented.
template <class T> const char *typeName()
{
return QMetaType(qMetaTypeId<T>()).name();
}
QObject *target;
QGenericArgument arg[10];
QGenericReturnArgument ret;
QVarLengthArray<char, 512> sig;
int lastArg;
bool success;
bool useRet;
Qt::ConnectionType connectionType;
mutable bool nag;
};
template <class Result>
class Invoker : public InvokerBase
{
public:
template <typename ...Args>
Invoker(QObject *target, const char *slot, const Args &...args)
{
setReturnValue(result);
(addArgument(args), ...);
InvokerBase::invoke(target, slot);
}
operator Result() const { return result; }
private:
Result result;
};
template<> class Invoker<void> : public InvokerBase
{
public:
template <typename ...Args>
Invoker(QObject *target, const char *slot, const Args &...args)
{
(addArgument(args), ...);
InvokerBase::invoke(target, slot);
}
};
#ifndef Q_QDOC
template <class Result>
Result invokeHelper(InvokerBase &in, QObject *target, const char *slot)
{
Result result;
in.setReturnValue(result);
in.invoke(target, slot);
return result;
}
template <>
inline void invokeHelper<void>(InvokerBase &in, QObject *target, const char *slot)
{
in.invoke(target, slot);
}
#endif
template<class Result, typename ...Args>
Result invoke(QObject *target, const char *slot, const Args &...args)
{
InvokerBase in;
(in.addArgument(args), ...);
return invokeHelper<Result>(in, target, slot);
}
} // namespace ExtensionSystem
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