retval?

/*
 *  call-seq:
 *     WIN32OLE_PARAM#retval?
 *
 *  Returns true if argument is return value.
 *     tobj = WIN32OLE_TYPE.new('DirectX 7 for Visual Basic Type Library', 
 *                              'DirectPlayLobbyConnection')
 *     method = WIN32OLE_METHOD.new(tobj, 'GetPlayerShortName')
 *     param = method.params[0]
 *     puts "#{param.name} #{param.retval?}"  # => name true
 */
static VALUE foleparam_retval(self)
    VALUE self;
{
    struct oleparamdata *pparam;
    Data_Get_Struct(self, struct oleparamdata, pparam);
    return ole_param_flag_mask(pparam->pTypeInfo, pparam->method_index, 
                               pparam->index, PARAMFLAG_FRETVAL);
}