Struct LifetimeWeakState 

pub struct LifetimeWeakState { /* private fields */ }

Weak handle to a LifetimeState, paired with the tag it was taken at.

LifetimeWeakState::upgrade fails once the owner is gone or the tag changed, which is how LifetimeRef, LifetimeRefMut and LifetimeLazy notice they went stale.

Implementations

impl LifetimeWeakState

pub unsafe fn upgrade_unchecked(&self) -> Option<LifetimeState>

Upgrades without checking the tag, so it succeeds even for a lifetime that was invalidated and reused.

Safety

The counters are always valid to touch, but the value the lifetime used to guard may be a different one by now. Only use this to release counters that this handle itself acquired.

pub fn upgrade(&self) -> Option<LifetimeState>

Upgrades to a strong handle, or returns None when the owner is gone or was invalidated.

pub fn is_owned_by(&self, state: &LifetimeState) -> bool

Returns true when this handle points at state.

Trait Implementations

impl Clone for LifetimeWeakState

fn clone(&self) -> LifetimeWeakState

Returns a duplicate of the value.

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

Performs copy-assignment from source.