Trait frame_support::storage::StorageDecodeLength

source · 
pub trait StorageDecodeLength: Sealed + DecodeLength {
    // Provided method
    fn decode_len(key: &[u8]) -> Option<usize> { ... }
}
Expand description

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§

source

fn decode_len(key: &[u8]) -> Option<usize>

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.

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

source§

impl<T: Encode> StorageDecodeLength for Vec<T>

Implementors§