AMDG david.weber@l-3com.com wrote:
I have a class, where I want callers to be able to register/deregister signals/slots. They will pass in a function pointer, and we'll hook it up to the signal, and manage the connection object.
Part of the management, is I need to map the function pointer to the actual connection object. This is where the trouble comes in. Since a boost::function doesn't have an operator <, the simplest way is to just map it to an unsigned long long, and store the raw address of the underlying function.
So, my connect function:
typedef VSSP (*TargetType) ( std::string, EncodingEnum); typedef boost::function < VSSP ( std::string, EncodingEnum) > CreateTypeFunc;
bool ElementBase::connectCreateTypeSignal(const CreateTypeFunc& slot) { LOG4CXX_DEBUG(logger_, "connectCreateTypeSignal in"); bool retValue = false;
unsigned long long slotAddr = (unsigned long long)slot.target< TargetType >(); LOG4CXX_DEBUG(logger_, "*** slotAddr = " + (boost::format("%08X") % slotAddr).str());
<snip> }
My debug printouts, are shoing unexpected behavior. The address that I am getting from target is different every time it is called, even though I'm calling with the same function (getTypeSlot). I would expect this if I was getting the address of the function object, because I'm creating one implicitly through the call, but not dereferencing via target(), unless I'm misunderstanding what target() does.
target returns a pointer to the function object. If TargetType is void(*)() target will return an object of type void(**)(). In Christ, Steven Watanabe