Hi, I have a problem with template in which I use QMap:
Qt Code: 
  1. template
  2. <
  3.         class IdentifierType,
  4.         class BytesToRead
  5. >
  6. class CommandHandler : public Command
  7. {
  8. public:
  9.     explicit CommandHandler();
  10.     ~CommandHandler();
  11.  
  12.     static bool registerCommand(const IdentifierType& identifier, Command* ptrToObject);
  13.     static bool unregisterCommand(const IdentifierType& identifier);
  14.     QPair<ResponseType::type, QByteArray> handleMessage(QByteArray* datagramPtr);
  15.  
  16. private:
  17.     static QMap<IdentifierType, Command*> _associations;
  18. };
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Qt Code: 
  1. template <class IdentifierType, class BytesToRead>
  2. bool
  3. CommandHandler<IdentifierType, BytesToRead>
  4. ::registerCommand(const IdentifierType& identifier, Command* ptrToObject)
  5. {
  6.     if(_associations.contains(identifier))
  7.         return 0;
  8.     else
  9.     {
  10.         _associations.insert(identifier, ptrToObject);
  11.         return 1;
  12.     }
  13. }
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Qt Code: 
  1. namespace TransportLayerType {
  2.     enum type{
  3.         V1 = 1
  4.     };
  5. }
  6.  
  7. typedef CommandHandler<TransportLayerType::type, quint8> TransportLayerHandler;
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And when I try to do this:
Qt Code: 
  1. TransportLayerHandler::registerCommand(TransportLayerType::V1, new TransportLayerV1());
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I get:
undefined reference to `CommandHandler<TransportLayerType::type, unsigned char>::_associations'
Do you have any ideas?

Thanks for help, Marcin.