Struct BalanceSnapshot 

pub struct BalanceSnapshot { /* private fields */ }

Snapshot of a single account’s lamports for simple balance assertions.

Implementations

impl BalanceSnapshot

pub fn capture(account: &AccountView) -> Self

Capture a single account’s lamport balance.

pub fn verify_increased_by( &self, account: &AccountView, min_increase: u64, ) -> ProgramResult

Verify the balance increased by at least min_increase.

pub fn verify_decreased_by_at_most( &self, account: &AccountView, max_decrease: u64, ) -> ProgramResult

Verify the balance decreased by at most max_decrease.

pub fn verify_unchanged(&self, account: &AccountView) -> ProgramResult

Verify the balance is unchanged.

pub fn before(&self) -> u64

Get the captured balance.

pub fn net_change(&self, account: &AccountView) -> i128

Compute the net change (positive = gained, negative = lost).

Returns the change as an i128 to avoid overflow.

Trait Implementations

impl Clone for BalanceSnapshot

fn clone(&self) -> BalanceSnapshot

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BalanceSnapshot

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

Formats the value using the given formatter.

impl Copy for BalanceSnapshot