Function sp_database::with_get
source · pub fn with_get<R, H: Clone + AsRef<[u8]>>(
db: &dyn Database<H>,
col: ColumnId,
key: &[u8],
f: impl FnMut(&[u8]) -> R
) -> Option<R>
Expand description
Call f
with the value previously stored against key
and return the result, or None
if
key
is not currently in the database.
This may be faster than get
since it doesn’t allocate.