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// Copyright (C) 2016 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 QDBUSPENDINGREPLY_H
#define QDBUSPENDINGREPLY_H
#include <QtDBus/qtdbusglobal.h>
#include <QtDBus/qdbusargument.h>
#include <QtDBus/qdbuspendingcall.h>
#ifndef QT_NO_DBUS
QT_BEGIN_NAMESPACE
class Q_DBUS_EXPORT QDBusPendingReplyBase : public QDBusPendingCall
{
protected:
QDBusPendingReplyBase();
~QDBusPendingReplyBase();
void assign(const QDBusPendingCall &call);
void assign(const QDBusMessage &message);
QVariant argumentAt(int index) const;
void setMetaTypes(int count, const QMetaType *metaTypes);
};
namespace QDBusPendingReplyTypes {
template<int Index, typename T, typename... Types>
struct Select
{
typedef Select<Index - 1, Types...> Next;
typedef typename Next::Type Type;
};
template<typename T, typename... Types>
struct Select<0, T, Types...>
{
typedef T Type;
};
template<typename T> inline QMetaType metaTypeFor()
{ return QMetaType::fromType<T>(); }
// specialize for QVariant, allowing it to be used in place of QDBusVariant
template<> inline QMetaType metaTypeFor<QVariant>()
{ return QMetaType::fromType<QDBusVariant>(); }
}
template<typename... Types>
class QDBusPendingReply : public QDBusPendingReplyBase
{
template<int Index> using Select = QDBusPendingReplyTypes::Select<Index, Types...>;
public:
enum { Count = std::is_same_v<typename Select<0>::Type, void> ? 0 : sizeof...(Types) };
inline constexpr int count() const { return Count; }
inline QDBusPendingReply() = default;
inline QDBusPendingReply(const QDBusPendingReply &other)
: QDBusPendingReplyBase(other)
{ }
inline Q_IMPLICIT QDBusPendingReply(const QDBusPendingCall &call) // required by qdbusxml2cpp-generated code
{ *this = call; }
inline Q_IMPLICIT QDBusPendingReply(const QDBusMessage &message)
{ *this = message; }
inline QDBusPendingReply &operator=(const QDBusPendingReply &other)
{ assign(other); return *this; }
inline QDBusPendingReply &operator=(const QDBusPendingCall &call)
{ assign(call); return *this; }
inline QDBusPendingReply &operator=(const QDBusMessage &message)
{ assign(message); return *this; }
using QDBusPendingReplyBase::argumentAt;
template<int Index> inline
typename Select<Index>::Type argumentAt() const
{
static_assert(Index >= 0 && Index < Count, "Index out of bounds");
typedef typename Select<Index>::Type ResultType;
return qdbus_cast<ResultType>(argumentAt(Index));
}
#if defined(Q_CLANG_QDOC)
bool isFinished() const;
void waitForFinished();
QVariant argumentAt(int index) const;
bool isValid() const;
bool isError() const;
QDBusError error() const;
QDBusMessage reply() const;
#endif
inline typename Select<0>::Type value() const
{
return argumentAt<0>();
}
inline operator typename Select<0>::Type() const
{
return argumentAt<0>();
}
private:
inline void calculateMetaTypes()
{
if (!d) return;
if constexpr (Count == 0) {
setMetaTypes(0, nullptr);
} else {
std::array<QMetaType, Count> typeIds = { QDBusPendingReplyTypes::metaTypeFor<Types>()... };
setMetaTypes(Count, typeIds.data());
}
}
inline void assign(const QDBusPendingCall &call)
{
QDBusPendingReplyBase::assign(call);
calculateMetaTypes();
}
inline void assign(const QDBusMessage &message)
{
QDBusPendingReplyBase::assign(message);
calculateMetaTypes();
}
};
template<>
class QDBusPendingReply<> : public QDBusPendingReplyBase
{
public:
enum { Count = 0 };
inline int count() const { return Count; }
inline QDBusPendingReply() = default;
inline QDBusPendingReply(const QDBusPendingReply &other)
: QDBusPendingReplyBase(other)
{ }
inline Q_IMPLICIT QDBusPendingReply(const QDBusPendingCall &call) // required by qdbusxml2cpp-generated code
{ *this = call; }
inline Q_IMPLICIT QDBusPendingReply(const QDBusMessage &message)
{ *this = message; }
inline QDBusPendingReply &operator=(const QDBusPendingReply &other)
{ assign(other); return *this; }
inline QDBusPendingReply &operator=(const QDBusPendingCall &call)
{ assign(call); return *this; }
inline QDBusPendingReply &operator=(const QDBusMessage &message)
{ assign(message); return *this; }
private:
inline void assign(const QDBusPendingCall &call)
{
QDBusPendingReplyBase::assign(call);
if (d)
setMetaTypes(0, nullptr);
}
inline void assign(const QDBusMessage &message)
{
QDBusPendingReplyBase::assign(message);
if (d)
setMetaTypes(0, nullptr);
}
};
QT_END_NAMESPACE
#endif // QT_NO_DBUS
#endif
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