Trait frame_support::storage::TryAppendDoubleMap

pub trait TryAppendDoubleMap<K1: Encode, K2: Encode, T: StorageTryAppend<I>, I: Encode> {
    fn try_append<LikeK1: EncodeLike<K1> + Clone, LikeK2: EncodeLike<K2> + Clone, LikeI: EncodeLike<I>>(
        key1: LikeK1, 
        key2: LikeK2, 
        item: LikeI
    ) -> Result<(), ()>;
}

Storage double map that is capable of StorageTryAppend.

Required methods

fn try_append<LikeK1: EncodeLike<K1> + Clone, LikeK2: EncodeLike<K2> + Clone, LikeI: EncodeLike<I>>(
    key1: LikeK1,
    key2: LikeK2,
    item: LikeI
) -> Result<(), ()>

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

This might fail if bounds are not respected.

Implementors

impl<K1, K2, T, I, StorageDoubleMapT> TryAppendDoubleMap<K1, K2, T, I> for StorageDoubleMapT where
    K1: FullCodec,
    K2: FullCodec,
    T: FullCodec + StorageTryAppend<I>,
    I: Encode,
    StorageDoubleMapT: StorageDoubleMap<K1, K2, T>,