| 1 | /* |
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| 2 | * BluezQt - Asynchronous BlueZ wrapper library |
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| 3 | * |
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| 4 | * SPDX-FileCopyrightText: 2019 Manuel Weichselbaumer <mincequi@web.de> |
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| 5 | * |
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| 6 | * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL |
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| 7 | */ |
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| 8 | |
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| 9 | #ifndef BLUEZQT_TPENDINGCALL_H |
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| 10 | #define BLUEZQT_TPENDINGCALL_H |
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| 11 | |
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| 12 | #include <QDBusPendingReply> |
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| 13 | |
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| 14 | #include "pendingcall.h" |
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| 15 | |
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| 16 | namespace BluezQt |
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| 17 | { |
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| 18 | using namespace std::placeholders; |
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| 19 | |
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| 20 | /*! |
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| 21 | * \inmodule BluezQt |
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| 22 | * \class BluezQt::TPendingCall |
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| 23 | * \inheaderfile BluezQt/TPendingCall |
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| 24 | * \brief Pending method call (template version). |
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| 25 | * |
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| 26 | * This class represents a pending method call. It is a convenient wrapper |
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| 27 | * around QDBusPendingReply and QDBusPendingCallWatcher. |
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| 28 | * The TPendingCall is a template class whose parameters are the types that will |
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| 29 | * be used to extract the contents of the reply's data. |
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| 30 | */ |
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| 31 | |
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| 32 | // KF6 TODO: convert all PendingCalls to TPendingCall (or convert existing PendingCall class to templated version). |
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| 33 | template<class... T> |
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| 34 | class TPendingCall : public PendingCall |
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| 35 | { |
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| 36 | private: |
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| 37 | template<int Index, typename Ty, typename... Ts> |
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| 38 | struct Select { |
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| 39 | using Type = typename Select<Index - 1, Ts...>::Type; |
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| 40 | }; |
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| 41 | template<typename Ty, typename... Ts> |
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| 42 | struct Select<0, Ty, Ts...> { |
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| 43 | using Type = Ty; |
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| 44 | }; |
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| 45 | |
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| 46 | public: |
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| 47 | /*! |
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| 48 | * Returns a return value at given index of the call. |
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| 49 | * |
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| 50 | * Returns the return value at position Index (which is a template parameter) cast to type Type. |
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| 51 | * This function uses template code to determine the proper Type type, according to the type |
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| 52 | * list used in the construction of this object. |
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| 53 | */ |
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| 54 | template<int Index> |
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| 55 | inline const typename Select<Index, T...>::Type valueAt() const |
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| 56 | { |
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| 57 | using ResultType = typename Select<Index, T...>::Type; |
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| 58 | return qdbus_cast<ResultType>(m_reply.argumentAt(Index)); |
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| 59 | } |
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| 60 | |
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| 61 | private: |
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| 62 | TPendingCall(const QDBusPendingCall &call, QObject *parent = nullptr) |
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| 63 | : PendingCall(call, std::bind(&TPendingCall::process, this, _1, _2, _3), parent) |
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| 64 | { |
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| 65 | } |
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| 66 | |
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| 67 | void process(QDBusPendingCallWatcher *watcher, ErrorProcessor errorProcessor, QVariantList *values) |
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| 68 | { |
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| 69 | m_reply = *watcher; |
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| 70 | errorProcessor(m_reply.error()); |
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| 71 | if (m_reply.isError()) { |
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| 72 | return; |
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| 73 | } |
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| 74 | |
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| 75 | for (int i = 0; i < m_reply.count(); ++i) { |
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| 76 | values->append(m_reply.argumentAt(i)); |
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| 77 | } |
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| 78 | } |
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| 79 | |
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| 80 | QDBusPendingReply<T...> m_reply; |
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| 81 | |
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| 82 | friend class MediaTransport; |
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| 83 | }; |
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| 84 | |
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| 85 | } // namespace BluezQt |
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| 86 | |
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| 87 | #endif |
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| 88 | |
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