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Allow constant associated empty root value. #77

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Allow constant associated empty root value. #77

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95892aa
ConstMemoryDB.
cheme Jan 31, 2020
dc86ddf
removing unused constraints.
cheme Feb 6, 2020
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13 changes: 13 additions & 0 deletions hash-db/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,19 @@ pub trait Hasher: Sync + Send {
fn hash(x: &[u8]) -> Self::Out;
}

/// Technical trait to avoid calculating empty root.
/// This trait assumes, an empty node is `[0u8]`.
pub trait HasherNullEmptyRoot: Hasher {
/// Associated constant value.
const EMPTY_ROOT: &'static [u8];
}

/// Test to call for all new `HasherNullEmptyRoot` implementation.
pub fn test_associated_empty_root<H: HasherNullEmptyRoot>() -> bool {
let empty = <H as Hasher>::hash(&[0u8]);
H::EMPTY_ROOT == empty.as_ref()
}

/// Trait modelling a plain datastore whose key is a fixed type.
/// The caller should ensure that a key only corresponds to
/// one value.
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