Struct StateSnapshot 

pub struct StateSnapshot<const SIZE: usize> { /* private fields */ }

A stack-allocated snapshot of account data.

SIZE is the maximum number of bytes captured.

Implementations

impl<const SIZE: usize> StateSnapshot<SIZE>

pub fn capture(data: &[u8]) -> Self

Capture a snapshot of account data.

If the data is longer than SIZE, only the first SIZE bytes are captured and was_truncated() returns true.

pub fn len(&self) -> usize

Length of captured data.

pub fn is_empty(&self) -> bool

Whether no data was captured.

pub fn was_truncated(&self) -> bool

Whether the source data was larger than the snapshot buffer.

pub fn data(&self) -> &[u8]

Get the captured data.

pub fn diff<'a>(&'a self, current: &'a [u8]) -> StateDiff<'a>

Compute a diff against current data.

Returns a StateDiff describing all changed regions.

pub fn has_changes(&self, current: &[u8]) -> bool

Check if any bytes changed compared to current data.

pub fn range_changed(&self, current: &[u8], offset: usize, len: usize) -> bool

Check if a specific byte range changed.

pub fn restore_into(&self, target: &mut [u8]) -> Result<(), ProgramError>

Restore the snapshot data back into a mutable slice.

Useful for rollback scenarios.