[Ipopt] dynamic_cast<OrigIpoptNLP*>(GetRawPtr(ip_cq->GetIpoptNLP())) returns NULL-Pointer during restoration phase

[holger ackermann]

Hello to the list,

this is my first post, so I'll write a few words about my "project". I'm
currently writing my master thesis in structural engineering about a new
algorithm to solve nonlinear constraint conditions in a spatial
framework analysis software. I already included Ipopt in this software
and my work is almost done except for this strange thing.

I need to evaluate the intermediate solution of the untransformed
problem in TNLP::intermediate_callback. I found this post
(http://list.coin-or.org/pipermail/ipopt/2008-November/001375.html) and
the proposed solution works fine except when I have problems that enter
the restoration phase. Say, when
  SolverReturn resto_status = resto_alg_->Optimize(true);
is called instead of
  status = p2alg->Optimize();

I'm using the C++ interface to Ipopt 3.6.1 and this is the code for
MY_NLP::intermediate_callback so far:
-->
OrigIpoptNLP* orignlp =	
  dynamic_cast<OrigIpoptNLP*>(GetRawPtr(ip_cq->GetIpoptNLP()));
assert(orignlp);
TNLPAdapter* tnlp_adapter =
  dynamic_cast<TNLPAdapter*>(GetRawPtr(orignlp->nlp()));
assert(tnlp_adapter);

Number* my_x = new Number[size_x];
tnlp_adapter->ResortX(*(Vector*)(GetRawPtr(ip_data->curr()->x())), my_x);

return check(my_x);
<--

During restoration phase
dynamic_cast<OrigIpoptNLP*>(GetRawPtr(ip_cq->GetIpoptNLP())) returns a
NULL-Pointer with which I cannot proceed as intended.

I'm not quite sure what "restoration phase" means as I'm not very
familiar with the theory of Ipopt, but maybe someone can give me a
hint if it's possible to get the intermediate solution during
restoration phase and (if yes) how to obtain it.


Any help is greatly appreciated, thanks in advance.

Holger