boost-signals

I am running function Foo from somebody else's library in a single-threaded application currently. Most of the time, I make a call to Foo and it's really quick, some times, I make a call to Foo and it takes forever. I am not a patient man, if Foo is going to take forever, I want to stop execution of Foo and not call it with those arguments. What is the best way to call Foo in a controlled manner (my current environment is POSIX/C++) such that I can stop execution after a certain number of seconds. I feel like the right thing to do here is to create a second thread to call Foo, while in my main

Boost.Signals allows various strategies of using the return values of slots to form the return value of the signal. E.g. adding them, forming a vector out of them, or returning the last one. The common wisdom (expressed in the Qt documentation [EDIT: as well as some answers to this question ] ) is that no such thing is possible with Qt signals. However, when I run the moc on the following class definition: class Object : public QObject { Q_OBJECT public: explicit Object( QObject * parent=0 ) : QObject( parent ) {} public Q_SLOTS: void voidSlot(); int intSlot(); Q_SIGNALS: void voidSignal();

I’m aware of the tutorial at boost.org addressing this: Boost.org Signals Tutorial , but the examples are not complete and somewhat over simplified. The examples there don’t show the include files and some sections of the code are a little vague. Here is what I need: ClassA raises multiple events/signals ClassB subscribes to those events (Multiple classes may subscribe) In my project I have a lower-level message handler class that raises events to a business class that does some processing of those messages and notifies the UI (wxFrames). I need to know how these all might get wired up (what