Struct FlagEvaluator 

pub struct FlagEvaluator { /* private fields */ }

Cheap to clone; the inner FlagSet lives behind an Arc<RwLock<_>>.

Implementations

impl FlagEvaluator

pub fn new(flagset: FlagSet) -> Self

Build an evaluator from an already-validated flagset.

pub fn swap(&self, flagset: FlagSet)

Atomically replace the loaded flagset. Used by crate::HotReloader.

pub fn snapshot(&self) -> FlagSet

Snapshot the current flagset. Mostly useful in tests.

pub fn evaluate( &self, flag_id: &str, subject: &Subject, ) -> Result<Evaluation, FeatureFlagError>

Evaluate a flag against a subject.

pub fn variant_or( &self, flag_id: &str, subject: &Subject, default: &str, ) -> String

Convenience: return just the variant string, falling back to default on any evaluation error (including UnknownFlag).

Trait Implementations

impl Clone for FlagEvaluator

fn clone(&self) -> FlagEvaluator

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FlagEvaluator

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

Formats the value using the given formatter.