Function pio_calculation_instance_active_constraint_identity_at 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pio_calculation_instance_active_constraint_identity_at(
    instance: *const PioCalculationInstance,
    constraint_index: usize,
    identity_index: usize,
    error: *mut *mut PioError,
) -> PioStringView

Read one selected component identity from an only constraint selection.

Safety

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