pounce-cinterface 0.2.0

C ABI for POUNCE (port of Ipopt's Interfaces/IpStdCInterface.{h,cpp}). Provides IpoptCreate / IpoptSolve / IpoptFreeProblem so existing PyIpopt / cyipopt / JuMP / AMPL clients link without source changes. Phase 11 — scaffolded; full implementation lands when the algorithm-side optimizer is solving.
Documentation

pounce-cinterface

C ABI for POUNCE. Port of Ipopt's Interfaces/IpStdCInterface.{h,cpp}.

Provides the IpoptCreate / IpoptSolve / IpoptFreeProblem entry points so existing PyIpopt, cyipopt, JuMP, and AMPL wrappers can link against POUNCE without source changes. Function names and signatures match upstream exactly: consumers swap libipopt.{dylib,so} for libpounce_cinterface.{dylib,so}.

Crate type

[lib]
crate-type = ["lib", "cdylib"]

The cdylib is what wrappers link against. The make install target in the workspace root drops libpounce_cinterface.{dylib,so} into $PREFIX/lib (default $HOME/.local/lib).

Surface

  • IpoptCreate(n, x_L, x_U, m, g_L, g_U, nele_jac, nele_hess, index_style, eval_f, eval_grad_f, eval_g, eval_jac_g, eval_h) → IpoptProblem handle.
  • IpoptSolve(problem, x, g, obj_val, mult_g, mult_x_L, mult_x_U, user_data) → ApplicationReturnStatus.
  • IpoptFreeProblem(problem).
  • AddIpoptStrOption / AddIpoptIntOption / AddIpoptNumOption — forward to the application's OptionsList.
  • SetIntermediateCallback.

All entry points are extern "C" and #[no_mangle]. Pointers are raw and the caller owns lifetimes; the IpoptProblem handle is opaque (void* from C).

Status

Phase 11 of the port. The FFI surface, option setters, and FreeIpoptProblem / SetIntermediateCallback are working. IpoptSolve currently returns InternalError; end-to-end solve through the C ABI lands when the algorithm-side optimizer is fully driving real TNLPs through the option-table path (it already solves real problems through the native Rust optimize_tnlp entry point — see pounce-nlp).

License

EPL-2.0.