Qt - emit a signal from a c++ thread

Question

I want to emit a signal from a C++ thread (std::thread) in Qt.

How can I do it?

Answer 1

If you're keeping pointer to your QObject then you could use one of QMetaObject::invokeMethod member http://qt-project.org/doc/qt-5/qmetaobject.html#invokeMethod

Probably you will have to use Qt::QueuedConnection so your signal will be invoked at proper thread (not your std::thread). Remember that your signal won't be invoked immedietly.