Struct StateChange 

pub struct StateChange {
    pub kind: StateChangeKind,
    pub key: LedgerKey,
    pub before: Option<LedgerEntry>,
    pub after: Option<LedgerEntry>,
}

On successful simulation of InvokeHostFunction operations, this field will be an array of LedgerEntrys before and after simulation occurred. Note that at least one of before or after will be present: before and no after indicates a deletion event, the inverse is a creation event, and both present indicates an update event. Or just check the type.

Fields

kind: StateChangeKind

Type of change

key: LedgerKey

The LedgerKey for this delta

before: Option<LedgerEntry>

If present, LedgerEntry state prior to simulation

after: Option<LedgerEntry>

If present, LedgerEntry state after simulation