Enum Availability 

pub enum Availability {
    Available,
    NotEnrolled,
    NoHardware,
    PasscodeNotSet,
    Lockout,
    DisabledByPolicy,
    Busy,
    Unsupported,
}

Whether a prompt can succeed right now, and if not, why.

Variants

Available

A biometric is enrolled and ready; a prompt will ask for it.

NotEnrolled

The device has a sensor but the person has not enrolled anything. A prompt that allows the device credential can still succeed.

NoHardware

The device has no biometric sensor. A prompt that allows the device credential can still succeed where the platform offers one (Apple and Android do, HarmonyOS does with a PIN enrolled, Windows Hello needs a PIN set up).

PasscodeNotSet

No passcode, PIN or password is set on the device, so nothing can be verified at all.

Lockout

Too many failed attempts: the biometric is locked until the device credential is entered.

DisabledByPolicy

A device policy (Windows Group Policy, an Android device admin) disables biometrics.

Busy

The sensor is in use by another request.

Unsupported

This platform has no API an app can use (desktop Linux, the web, Android below API 28).

Trait Implementations

impl Clone for Availability

fn clone(&self) -> Availability

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Availability

impl Debug for Availability

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

Formats the value using the given formatter.

impl Eq for Availability

impl PartialEq for Availability

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Availability