Enum SolveStatus 

pub enum SolveStatus {
    Optimal,
    Acceptable,
    Infeasible,
    LocalInfeasibility,
    MaxIterations,
    NumericalError,
    Unbounded,
    RestorationFailed,
    EvaluationError,
    UserRequestedStop,
    InternalError,
}

Status of the solve.

Variants

Optimal

Converged to optimal solution within tolerance.

Acceptable

Converged to an acceptable solution: KKT residuals within the relaxed acceptable-level tolerances (matching Ipopt’s Solved_To_Acceptable_Level). Counted as “solved” by the benchmark reporter — the iterate is at a stationary point that Ipopt’s default user-facing settings would also return.

Infeasible

Problem is infeasible.

LocalInfeasibility

Local infeasibility detected: constraint violation is at a stationary point (gradient of violation ≈ 0) but violation is still large. For NE-to-LS reformulations, this means the system is inconsistent and x* is the best least-squares solution.

MaxIterations

Reached maximum number of iterations.

NumericalError

Numerical difficulties (e.g., singular KKT system).

Unbounded

Problem appears unbounded below.

RestorationFailed

Restoration phase failed.

EvaluationError

User callback returned false, indicating evaluation failure at the current iterate (not during line search, where failures cause step rejection instead).

UserRequestedStop

Intermediate callback returned false, requesting early termination.

InternalError

Internal error.

Trait Implementations

impl Clone for SolveStatus

fn clone(&self) -> SolveStatus

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SolveStatus

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for SolveStatus

fn eq(&self, other: &SolveStatus) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SolveStatus

impl Eq for SolveStatus

impl StructuralPartialEq for SolveStatus