Struct CanPopRegistration 

pub struct CanPopRegistration(/* private fields */);

Proof-of-registration token returned by set_can_pop_provider.

The provider slot is single-registrant: at most one live provider exists at a time, and a later set_can_pop_provider call replaces the earlier registration without warning (the facade’s BackHandler is expected to be constructed once, at the app root). This token is what makes that replacement safe against out-of-order teardown: CanPopRegistration::unregister clears the slot only if this registration is still the live one, so a replaced (stale) handler’s on_cleanup can never clear a newer handler’s provider out from under it. A future multi-handler/intercept design must replace this slot with a stack — see the module docs.

Implementations

impl CanPopRegistration

pub fn unregister(self)

Unregister this provider iff it is still the live registration; a stale token (already replaced by a newer set_can_pop_provider call) is a harmless no-op, leaving the newer provider intact. Safe on any thread (a non-UI thread’s slot is empty, so it no-ops).

Trait Implementations

impl Debug for CanPopRegistration

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

Formats the value using the given formatter.