Function pio_calculation_instance_active_constraint_at 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pio_calculation_instance_active_constraint_at(
    instance: *const PioCalculationInstance,
    index: usize,
    output: *mut PioActiveConstraintView,
    error: *mut *mut PioError,
) -> bool

Read one active constraint family by zero based position.

Safety

Pointers and handles must satisfy the crate-level safety requirements.