Function GetIpoptCurrentIterate 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn GetIpoptCurrentIterate(
    ipopt_problem: IpoptProblem,
    _scaled: Bool,
    n: Index,
    x: *mut Number,
    z_l: *mut Number,
    z_u: *mut Number,
    m: Index,
    g: *mut Number,
    lambda: *mut Number,
) -> Bool

Port of IpStdCInterface.cpp:GetIpoptCurrentIterate (Ipopt 3.14+). Designed to be called from inside an intermediate callback to inspect x, the bound multipliers z_L/z_U, the constraint values g, and the constraint multipliers lambda at the current iterate.

All output buffers are optional — pass NULL to skip. n and m must match the dimensions the problem was created with; mismatched sizes cause the function to return FALSE without writing.

scaled is currently ignored — quantities are reported in the user TNLP’s unscaled space (matching upstream Ipopt’s default caller behavior when scaling is unused). Honoring scaled for the gradient-based scaler is a follow-up.

Returns FALSE when called outside an active intermediate callback (no live iterate to inspect).

Safety

ipopt_problem must be a valid IpoptProblem. Each output buffer, when non-NULL, must hold at least the declared length.