code: func (v *Action) GetParameterType() *VariantType {
  	c := C.g_action_get_parameter_type(v.native())
  	if c == nil {
  		return nil
  	}
  	return newVariantType((*C.GVariantType)(c))
  }
docs: // GetParameterType is a wrapper around g_action_get_parameter_type