Module ancient_append_vecs

helpers for squashing append vecs into ancient append vecs an ancient append vec is:

1. a slot that is older than an epoch old
2. multiple ‘slots’ squashed into a single older (ie. ancient) slot for convenience and performance Otherwise, an ancient append vec is the same as any other append vec

Structs

• AccountsToStore
  reference a set of accounts to store The accounts may have to be split between 2 storages (primary and overflow) if there is not enough room in the primary storage. The ‘store’ functions need data stored in a slice of specific type. We need 1-2 of these slices constructed based on available bytes and individual account sizes. The slice arithmetic across both hashes and account data gets messy. So, this struct abstracts that.

Enums

• StorageSelector
  a set of accounts need to be stored. If there are too many to fit in ‘Primary’, the rest are put in ‘Overflow’

Functions

• get_ancient_append_vec_capacity
  capacity of an ancient append vec
• is_ancient
  is this a max-size append vec designed to be used as an ancient append vec?