[timeguest]

Hi, all
I've come into a problem which I think may be encountered by others too. When I use the mechanism of AMI, as ICE's Doc show:
class AMI_callback {
virtual void ice_response(...);
};
AMI_callbackPtr cb = new AMI_callbackI;
model->interpolate_async(cb,grid,0);//first call
model->interpolate_async(cb,grid,0);//call twice

My problem is, how could I match the response and the request of these two calls when there's only one ice_response method?
Insert a serial no into each call's input&output params may be a solution, but is there anything better and more graceful?