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Struct pallet_mmr::ParentNumberAndHash

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pub struct ParentNumberAndHash<T: Config> { /* private fields */ }
Expand description

The most common use case for MMRs is to store historical block hashes, so that any point in time in the future we can receive a proof about some past blocks without using excessive on-chain storage.

Hence we implement the LeafDataProvider for ParentNumberAndHash which is a crate-local wrapper over [frame_system::Pallet]. Since the current block hash is not available (since the block is not finished yet), we use the parent_hash here along with parent block number.

Trait Implementations§

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impl<T: Config> LeafDataProvider for ParentNumberAndHash<T>

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type LeafData = (<<<T as Config>::Block as HeaderProvider>::HeaderT as Header>::Number, <T as Config>::Hash)

A type that should end up in the leaf of MMR.
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fn leaf_data() -> Self::LeafData

The method to return leaf data that should be placed in the leaf node appended MMR at this block. Read more

Auto Trait Implementations§

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impl<T> Freeze for ParentNumberAndHash<T>

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impl<T> RefUnwindSafe for ParentNumberAndHash<T>
where T: RefUnwindSafe,

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impl<T> Send for ParentNumberAndHash<T>
where T: Send,

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impl<T> Sync for ParentNumberAndHash<T>
where T: Sync,

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impl<T> Unpin for ParentNumberAndHash<T>
where T: Unpin,

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impl<T> UnwindSafe for ParentNumberAndHash<T>
where T: UnwindSafe,

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