flow-gate-ffi 0.1.0

C-ABI foreign function interface for flow-gate, enabling Python/R bindings
Documentation 
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use flow_gate_core::{FlowGateError, GateId, ParameterName};
use flow_gate_ffi::{flow_gate_ffi_error_free, FfiError};

#[test]
fn ffi_error_codes_are_stable() {
    let samples = [
        (FlowGateError::InvalidTransformParam("x".into()), 1_u32),
        (FlowGateError::InvalidGate("x".into()), 2_u32),
        (
            FlowGateError::UnknownParameter(ParameterName::from("P1")),
            3_u32,
        ),
        (FlowGateError::XmlParse("x".into()), 4_u32),
        (FlowGateError::NotPositiveDefinite, 5_u32),
        (
            FlowGateError::CyclicGateReference(GateId::from("G1")),
            6_u32,
        ),
        (
            FlowGateError::UnknownGateReference(GateId::from("G1"), GateId::from("G9")),
            7_u32,
        ),
        (
            FlowGateError::MissingAttribute("id".into(), "Gate".into()),
            8_u32,
        ),
        (
            FlowGateError::InvalidFloat("x".into(), "value".into()),
            9_u32,
        ),
        (
            FlowGateError::BooleanNotArity(GateId::from("G2"), 2),
            10_u32,
        ),
        (
            FlowGateError::BooleanEmptyOperands(GateId::from("G3")),
            11_u32,
        ),
        (FlowGateError::DimensionMismatch(1, 2), 12_u32),
        (FlowGateError::MissingParentGate(GateId::from("P")), 13_u32),
    ];

    for (err, expected_code) in samples {
        let mut ffi = FfiError::from_gating_error(&err);
        assert_eq!(ffi.code, expected_code);
        // SAFETY: message pointer was allocated by FfiError::from_gating_error.
        unsafe { flow_gate_ffi_error_free(&mut ffi) };
    }
}