[Ipopt] intermediate_callback Method

[Nandini Chakravorti]

Hi,
      I am using the C++ version of Ipopt. I have a class which inherits
from TNLP and I provide an implementation for *intermediate_callback*  in my
derived class. But the execution never reaches my implementation.

      Can someone suggest something? Is there some option that needs to be
set?

Regards,
Nandini
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