Struct ConditionStack 

pub struct ConditionStack { /* private fields */ }

A stack of ConditionHandlers, searched innermost-first on signal.

Models the dynamic-extent handler chain of the condition system; signalling dispatches to the nearest handler whose kind matches.

Implementations

impl ConditionStack

pub fn new() -> Self

Builds an empty condition stack.

pub fn push(&mut self, handler: ConditionHandler)

Installs handler as the new innermost handler.

pub fn pop(&mut self) -> Option<ConditionHandler>

Removes and returns the innermost handler, if any.

pub fn signal( &self, cx: &mut Cx, condition: Condition, ) -> Result<ContinuationValue>

Signals condition, capturing against the nearest matching handler and returning the resulting ContinuationValue.

Fails with Error::Eval when no handler matches the condition kind.

pub fn nearest_handler(&self, kind: &Symbol) -> Result<&ConditionHandler>

Returns the innermost handler matching kind, or Error::Eval when none is installed.

Trait Implementations

impl Clone for ConditionStack

fn clone(&self) -> ConditionStack

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConditionStack

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

Formats the value using the given formatter.

impl Default for ConditionStack

fn default() -> ConditionStack

Returns the “default value” for a type.

impl Eq for ConditionStack

impl PartialEq for ConditionStack

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ConditionStack