Struct Ref 

pub struct Ref<'a, T: ?Sized> { /* private fields */ }

Shared (immutable) borrow guard for account data.

On drop, decrements the borrow count in RuntimeAccount.borrow_state.

Implementations

impl<'a, T: ?Sized> Ref<'a, T>

pub fn map<U: ?Sized>(orig: Self, f: impl FnOnce(&T) -> &U) -> Ref<'a, U>

Narrow a guard to a field or slice without releasing its account borrow.

pub fn try_map<U: ?Sized, E>( orig: Self, f: impl FnOnce(&T) -> Result<&U, E>, ) -> Result<Ref<'a, U>, (Self, E)>

Narrow a guard, returning the original guard and error on failure.

pub fn filter_map<U: ?Sized>( orig: Self, f: impl FnOnce(&T) -> Option<&U>, ) -> Result<Ref<'a, U>, Self>

Narrow a guard, returning the original guard if the field is absent.

pub unsafe fn from_raw_parts(value: &'a T, state: *mut u8) -> Self

Create a shared borrow guard from raw parts.

Safety

The caller must ensure:

• The borrow state at state was already incremented
• value is valid for lifetime 'a
• state points to a valid RuntimeAccount.borrow_state

pub fn into_raw_parts(self) -> (&'a T, *mut u8)

Decompose into raw parts without running the destructor.

The caller takes responsibility for eventually releasing the borrow (decrementing *state).

Trait Implementations

impl<T: ?Sized> Deref for Ref<'_, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T: ?Sized> Drop for Ref<'_, T>

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.