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35 /*! \libinternal \file
37 * Declares gmx::MdModuleNotification.
39 * \author Christian Blau <blau@kth.se>
41 * \ingroup module_utility
44 #ifndef GMX_UTILITY_MDMODULENOTIFICATION_IMPL_H
45 #define GMX_UTILITY_MDMODULENOTIFICATION_IMPL_H
53 /*! \libinternal \brief
54 * Subscribe and trigger notification functions.
56 * Extends MdModuleNotificationBase with new notification function and routine
57 * to subscribe new listeners.
59 * To create a class of this type that provides callbacks, e.g., for events
60 * EventA, and EventB use registerMdModuleNotification<EventA, EventB>::type.
62 * \tparam CallParameter of the function to be notified
63 * \tparam MdModuleNotificationBase class to be extended with a notification
66 * \note All added subscribers are required to out-live the MdModuleNotification
69 template<class CallParameter, class MdModuleNotificationBase>
70 class MdModuleNotification : public MdModuleNotificationBase
73 //! Make base class notification trigger available to this class
74 using MdModuleNotificationBase::notify;
75 //! Make base class subscription available to this class
76 using MdModuleNotificationBase::subscribe;
78 /*! \brief Trigger the subscribed notifications.
79 * \param[in] callParameter of the function to be called back
81 void notify(CallParameter callParameter) const
83 for (auto& callBack : callBackFunctions_)
85 callBack(callParameter);
90 * Add callback function to be called when notification is triggered.
92 * Notifications are distinguished by their call signature.
94 * \param[in] callBackFunction to be called from this class
96 void subscribe(std::function<void(CallParameter)> callBackFunction)
98 callBackFunctions_.emplace_back(callBackFunction);
102 std::vector<std::function<void(CallParameter)>> callBackFunctions_;
106 * \brief Aide to avoid nested MdModuleNotification definition.
109 * MdModuleNotification<CallParameterA, MdModuleNotification<CallParameterB, etc ... >>
110 * this allows to write
111 * registerMdModuleNotification<CallParameterA, CallParameterB, ...>::type
113 * \tparam CallParameter all the event types to be registered
115 template<class... CallParameter>
116 struct registerMdModuleNotification;
118 /*! \internal \brief Template specialization to end parameter unpacking recursion.
121 struct registerMdModuleNotification<>
124 * \brief Do nothing but be base class of MdModuleNotification.
126 * Required so that using MdModuleNotificationBase::notify and
127 * MdModuleNotificationBase::subscribe are valid in derived class.
129 class NoCallParameter
132 //! Do nothing but provide MdModuleNotification::notify to derived class
134 //! Do nothing but provide MdModuleNotification::subscribe to derived class
137 /*! \brief Defines a type if no notifications are managed.
139 * This ensures that code works with MdModuleCallParameterManagement that
140 * does not manage any notifications.
142 using type = NoCallParameter;
146 * \brief Template specialization to assemble MdModuleNotification.
148 * Assembly of MdModuleNotification is performed by recursively taking off the
149 * front of the CallParameter parameter pack and constructing the nested type
150 * definition of MdModuleNotification base classes.
152 * \tparam CurrentCallParameter front of the template parameter pack
153 * \tparam CallParameter rest of the event types
155 template<class CurrentCallParameter, class... CallParameter>
156 struct registerMdModuleNotification<CurrentCallParameter, CallParameter...>
159 //! The next type with rest of the arguments with the front parameter removed.
160 using next_type = typename registerMdModuleNotification<CallParameter...>::type;
161 //! The type of the MdModuleNotification
162 using type = MdModuleNotification<CurrentCallParameter, next_type>;