Trait frame_support::storage::TryAppendDoubleMap

pub trait TryAppendDoubleMap<K1: Encode, K2: Encode, T: StorageTryAppend<I>, I: Encode> {
    // Required method
    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.

Object Safety

This trait is not object safe.

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>,