Environment: Linux C++ / Qt 4x
I do not understand why the following downcast returns NULL? I pasted base and derived class below.
Thanks in advance for any tips or suggestions.
-Ed
void MainWindow::onRtledaEventHandler(fes::EventArgs eventArgs)
{
// This cast returns a NULL ?
fes::AtsCommandEventArgs* atsCommandEventArgs = dynamic_cast<fes::AtsCommandEventArgs*>(&eventArgs);
}
/// The base class for containing event arguments sent to clients using boost::signals2
class EventArgs
{
public:
EventArgs() {}
EventArgs(RtledaEventType eventType) :
m_eventType(eventType) {}
EventArgs(const EventArgs& eventArgs) :
m_eventType(eventArgs.m_eventType) {}
virtual ~EventArgs() {}
/// The type of event this is
RtledaEventType eventType() const { return m_eventType; }
protected:
RtledaEventType m_eventType;
};
// Derived class I am trying to upcast to
class AtsCommandEventArgs : public EventArgs
{
public:
/// \param [in] lraddsPacketError LRADDS oacket error structure
/// \sa fes::StructPacketStats_t packetStats
AtsCommandEventArgs(fes::AtsCommand atsCommand, std::string messageBuffer, std::string details) :
EventArgs(RtledaEventTypeAtsCommand),
m_atsCommand(atsCommand),
m_messageBuffer(messageBuffer),
m_details(details) {}
AtsCommandEventArgs(const AtsCommandEventArgs& AtsCommandEventArgs) :
EventArgs(AtsCommandEventArgs),
m_atsCommand(AtsCommandEventArgs.m_atsCommand),
m_messageBuffer(AtsCommandEventArgs.m_messageBuffer),
m_details(AtsCommandEventArgs.m_details) {}
AtsCommandEventArgs() {}
~AtsCommandEventArgs() {}
fes::AtsCommand atsCommand() const { return m_atsCommand; }
std::string messageBuffer() const { return m_messageBuffer; }
std::string details() const { return m_details; }
private:
fes::AtsCommand m_atsCommand;
std::string m_messageBuffer;
std::string m_details;
};
Thanks in advance for any tips or suggestions,
-Ed