Trait frame_support::storage::StorageDecodeLength [−][src]
Marker trait that will be implemented for types that support to decode their length in an
effificent way. It is expected that the length is at the beginning of the encoded object
and that the length is a Compact<u32>
.
This trait is sealed.
Provided methods
fn decode_len(key: &[u8]) -> Option<usize>
[src]
Decode the length of the storage value at key
.
This function assumes that the length is at the beginning of the encoded object
and is a Compact<u32>
.
Returns None
if the storage value does not exist or the decoding failed.