diff options
| -rw-r--r-- | lib/util.h | 28 |
1 files changed, 28 insertions, 0 deletions
@@ -20,6 +20,7 @@ #include <QtCore/QMetaEnum> #include <QtCore/QDebug> +#include <QtCore/QPointer> #include <functional> #include <memory> @@ -41,6 +42,7 @@ namespace QMatrixClient } #endif + /** static_cast<> for unique_ptr's */ template <typename T1, typename PtrT2> inline auto unique_ptr_cast(PtrT2&& p) { @@ -55,5 +57,31 @@ namespace QMatrixClient template <typename T> static void qAsConst(const T &&) Q_DECL_EQ_DELETE; #endif + + /** A guard pointer that disconnects an interested object upon destruction + * It's almost QPointer<> except that you have to initialise it with one + * more additional parameter - a pointer to a QObject that will be + * disconnected from signals of the underlying pointer upon the guard's + * destruction. + */ + template <typename T> + class ConnectionsGuard : public QPointer<T> + { + public: + ConnectionsGuard(T* publisher, QObject* subscriber) + : QPointer<T>(publisher), subscriber(subscriber) + { } + ~ConnectionsGuard() + { + if (*this) + (*this)->disconnect(subscriber); + } + ConnectionsGuard(ConnectionsGuard&&) noexcept = default; + ConnectionsGuard& operator=(ConnectionsGuard&&) noexcept = default; + using QPointer<T>::operator=; + + private: + QObject* subscriber; + }; } // namespace QMatrixClient |