Call a C++ base class method automatically

Question

I\'m trying to implement the command design pattern, but I\'m stumbling accross a conceptual problem. Let\'s say you have a base class and a few subclasses like in the examp

Answer 1

Split the operator in two different methods, e.g. execute and executeImpl (to be honest, I don't really like the () operator). Make Command::execute non-virtual, and Command::executeImpl pure virtual, then let Command::execute perform the registration, then call it executeImpl, like this:

class Command
   {
   public:
      ResultType execute()
         {
         ... // do registration
         return executeImpl();
         }
   protected:
      virtual ResultType executeImpl() = 0;
   };

class SomeCommand
   {
   protected:
      virtual ResultType executeImpl();
   };