[Ipopt] Getting NLP values of each iteration

[Gianpaolo Gulletta]

Dear all,

I am implementing CoinIpopt with AMPL interface in C++.

I would like to have access through the code to the NLP values 
(objective function, dual infeasibility, overall error,etc.) of each 
iteration. Do you know how to do it?

Thank you.

Best Regards,

Gianpaolo