code: def add(self, crash):
          
          self.__keys.add( crash.signature )
          self.__count += 1
docs: Adds a new crash to the container.
  
          @note:
              When the C{allowRepeatedKeys} parameter of the constructor
              is set to C{False}, duplicated crashes are ignored.
  
          @see: L{Crash.key}
  
          @type  crash: L{Crash}
          @param crash: Crash object to add.