Re: How in the designer of object to refuse its creation?
it is passed...
The global event handler does not interrupt a performance thread in which there was a problem. If the program one-continuous generally happens nothing before flow clearing. In my case there is the main flow servicing worker threads, but to hope that it especially quickly fulfills it is not necessary.
Forgive, not so understood that you wanted to tell. Without insults, I while on your place to write multi-threaded applications. These are servers SQL almost transparently provide a multiple user mode with a thread safety warranty - and there game rules the nobility it is necessary.
Where it is possible to read more in detail about all restrictions on usage of exceptions in Qt?
Above gave the reference on qt.io. But, and so common sense and such articles. At Sattera and Aleksandressku "coding Standards on With ++" (on storage) are section about boundary between units and why in between it is impossible to throw exceptions. Very similar on a current question.