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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
#ifndef EXTENSIONSYSTEM_INVOKER_H
#define EXTENSIONSYSTEM_INVOKER_H
#include "extensionsystem_global.h"
#include <QtCore/QMetaMethod>
#include <QtCore/QMetaObject>
#include <QtCore/QMetaType>
#include <QtCore/QVarLengthArray>
namespace ExtensionSystem {
class EXTENSIONSYSTEM_EXPORT InvokerBase
{
public:
InvokerBase();
~InvokerBase();
bool wasSuccessful() const;
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::typeName(qMetaTypeId<T>());
}
QObject *target;
QGenericArgument arg[10];
QGenericReturnArgument ret;
QVarLengthArray<char, 512> sig;
int lastArg;
bool success;
bool useRet;
mutable bool nag;
};
template <class Result>
class Invoker : public InvokerBase
{
public:
Invoker(QObject *target, const char *slot)
{
InvokerBase::invoke(target, slot);
}
template <class T0>
Invoker(QObject *target, const char *slot, const T0 &t0)
{
setReturnValue(result);
addArgument(t0);
InvokerBase::invoke(target, slot);
}
template <class T0, class T1>
Invoker(QObject *target, const char *slot, const T0 &t0, const T1 &t1)
{
setReturnValue(result);
addArgument(t0);
addArgument(t1);
InvokerBase::invoke(target, slot);
}
template <class T0, class T1, class T2>
Invoker(QObject *target, const char *slot, const T0 &t0,
const T1 &t1, const T2 &t2)
{
setReturnValue(result);
addArgument(t0);
addArgument(t1);
addArgument(t2);
InvokerBase::invoke(target, slot);
}
operator Result() const { return result; }
private:
Result result;
};
template<> class Invoker<void> : public InvokerBase
{
public:
Invoker(QObject *target, const char *slot)
{
InvokerBase::invoke(target, slot);
}
template <class T0>
Invoker(QObject *target, const char *slot, const T0 &t0)
{
addArgument(t0);
InvokerBase::invoke(target, slot);
}
template <class T0, class T1>
Invoker(QObject *target, const char *slot, const T0 &t0, const T1 &t1)
{
addArgument(t0);
addArgument(t1);
InvokerBase::invoke(target, slot);
}
template <class T0, class T1, class T2>
Invoker(QObject *target, const char *slot, const T0 &t0,
const T1 &t1, const T2 &t2)
{
addArgument(t0);
addArgument(t1);
addArgument(t2);
InvokerBase::invoke(target, slot);
}
};
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);
}
template<class Result>
Result invoke(QObject *target, const char *slot)
{
InvokerBase in;
return invokeHelper<Result>(in, target, slot);
}
template<class Result, class T0>
Result invoke(QObject *target, const char *slot, const T0 &t0)
{
InvokerBase in;
in.addArgument(t0);
return invokeHelper<Result>(in, target, slot);
}
template<class Result, class T0, class T1>
Result invoke(QObject *target, const char *slot, const T0 &t0, const T1 &t1)
{
InvokerBase in;
in.addArgument(t0);
in.addArgument(t1);
return invokeHelper<Result>(in, target, slot);
}
template<class Result, class T0, class T1, class T2>
Result invoke(QObject *target, const char *slot,
const T0 &t0, const T1 &t1, const T2 &t2)
{
InvokerBase in;
in.addArgument(t0);
in.addArgument(t1);
in.addArgument(t2);
return invokeHelper<Result>(in, target, slot);
}
} // namespace ExtensionSystem
#endif // EXTENSIONSYSTEM_INVOKER_H
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