Module ipopt_alg 

Main optimization loop — port of Algorithm/IpIpoptAlg.{hpp,cpp}.

Phase 7 ships the loop scaffold matching Optimize() lines 292-563 in upstream. The body invokes:

1. IterateInitializer::set_initial_iterates
2. (loop) OutputIteration → CheckConvergence → UpdateBarrierParameter → UpdateHessian → ComputeSearchDirection → ComputeAcceptableTrialPoint → AcceptTrialPoint
3. correct_bound_multiplier (kappa_sigma) per MAIN_LOOP.md §“Bound multiplier reset” lines 1055-1134
4. exception → SolverReturn mapping per the table in MAIN_LOOP.md.

The NLP handle and search-direction calculator are optional: when both are present, iterate() computes a real Newton step and drives the line search. Without them, iterate() runs the bookkeeping pieces (mu update, hessian update, conv check, kappa_sigma reset) and is exercised by structural unit tests. The full path lights up once pounce-nlp::OrigIpoptNLP lands.

Structs

IpoptAlgorithm

Functions

kappa_sigma_clamp

Per-element kappa-sigma clamp — the elementwise arithmetic at the heart of IpIpoptAlg.cpp:correct_bound_multiplier (lines 1090-1133). For each index i: