Struct solana_runtime::append_vec::StorableAccountsWithHashesAndWriteVersions

pub struct StorableAccountsWithHashesAndWriteVersions<'a: 'b, 'b, T: ReadableAccount + Sync + 'b, U: StorableAccounts<'a, T>, V: Borrow<Hash>> { /* private fields */ }

Goal is to eliminate copies and data reshaping given various code paths that store accounts. This struct contains what is needed to store accounts to a storage

1. account & pubkey (StorableAccounts)
2. hash per account (Maybe in StorableAccounts, otherwise has to be passed in separately)
3. write version per account (Maybe in StorableAccounts, otherwise has to be passed in separately)

Implementations

impl<'a: 'b, 'b, T: ReadableAccount + Sync + 'b, U: StorableAccounts<'a, T>, V: Borrow<Hash>> StorableAccountsWithHashesAndWriteVersions<'a, 'b, T, U, V>

pub fn new(accounts: &'b U) -> Self

used when accounts contains hash and write version already

pub fn new_with_hashes_and_write_versions(
    accounts: &'b U,
    hashes: Vec<V>,
    write_versions: Vec<StoredMetaWriteVersion>
) -> Self

used when accounts does NOT contains hash or write version In this case, hashes and write_versions have to be passed in separately and zipped together.

pub fn hash(&self, index: usize) -> &Hash

hash for the account at ‘index’

pub fn write_version(&self, index: usize) -> u64

write_version for the account at ‘index’

pub fn account(&self, index: usize) -> Option<&T>

None if account at index has lamports == 0 Otherwise, Some(account) This is the only way to access the account.

pub fn pubkey(&self, index: usize) -> &Pubkey

pubkey at ‘index’

pub fn len(&self) -> usize

accounts to write

pub fn is_empty(&self) -> bool