Trait frame_support::storage::TryAppendMap

pub trait TryAppendMap<K: Encode, T: StorageTryAppend<I>, I: Encode> {
    fn try_append<LikeK: EncodeLike<K> + Clone, LikeI: EncodeLike<I>>(
        key: LikeK, 
        item: LikeI
    ) -> Result<(), ()>;
}

Storage map that is capable of StorageTryAppend.

Required methods

fn try_append<LikeK: EncodeLike<K> + Clone, LikeI: EncodeLike<I>>(
    key: LikeK,
    item: LikeI
) -> Result<(), ()>

Try and append the item into the storage map at the given key.

This might fail if bounds are not respected.

Implementors

impl<K, T, I, StorageMapT> TryAppendMap<K, T, I> for StorageMapT where
    K: FullCodec,
    T: FullCodec + StorageTryAppend<I>,
    I: Encode,
    StorageMapT: StorageMap<K, T>,