Trait bm_le::Construct

pub trait Construct {
    type Intermediate: Clone;
    type End: Clone + Default;
    fn intermediate_of(
        left: &Value<Self::Intermediate, Self::End>, 
        right: &Value<Self::Intermediate, Self::End>
    ) -> Self::Intermediate;
    fn empty_at<DB>(
        db: &mut DB, 
        depth_to_bottom: usize
    ) -> Result<Value<Self::Intermediate, Self::End>, <DB as Backend>::Error>
    where
        DB: WriteBackend<Construct = Self>;
}

Construct for a merkle tree.

Associated Types

type Intermediate: Clone

Intermediate value stored in this merkle database.

type End: Clone + Default

End value stored in this merkle database.

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Required methods

fn intermediate_of(
    left: &Value<Self::Intermediate, Self::End>,
    right: &Value<Self::Intermediate, Self::End>
) -> Self::Intermediate

Get the intermediate value of given left and right child.

fn empty_at<DB>(
    db: &mut DB,
    depth_to_bottom: usize
) -> Result<Value<Self::Intermediate, Self::End>, <DB as Backend>::Error> where
    DB: WriteBackend<Construct = Self>, 

Get or create the empty value given a backend. empty_at(0) should always equal to Value::End(Default::default()).

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Implementors

impl<D, T> Construct for InheritedDigestConstruct<D, T> where
    D: Digest,
    T: Clone + Default + AsRef<[u8]>, 

type Intermediate = GenericArray<u8, <D as Digest>::OutputSize>

type End = T

fn intermediate_of(
    left: &Value<<InheritedDigestConstruct<D, T> as Construct>::Intermediate, <InheritedDigestConstruct<D, T> as Construct>::End>,
    right: &Value<<InheritedDigestConstruct<D, T> as Construct>::Intermediate, <InheritedDigestConstruct<D, T> as Construct>::End>
) -> <InheritedDigestConstruct<D, T> as Construct>::Intermediate

fn empty_at<DB>(
    db: &mut DB,
    depth_to_bottom: usize
) -> Result<Value<<InheritedDigestConstruct<D, T> as Construct>::Intermediate, <InheritedDigestConstruct<D, T> as Construct>::End>, <DB as Backend>::Error> where
    DB: WriteBackend<Construct = InheritedDigestConstruct<D, T>>, 

impl<D, T> Construct for UnitDigestConstruct<D, T> where
    D: Digest,
    T: Clone + Default + AsRef<[u8]>, 

type Intermediate = GenericArray<u8, <D as Digest>::OutputSize>

type End = T

fn intermediate_of(
    left: &Value<<UnitDigestConstruct<D, T> as Construct>::Intermediate, <UnitDigestConstruct<D, T> as Construct>::End>,
    right: &Value<<UnitDigestConstruct<D, T> as Construct>::Intermediate, <UnitDigestConstruct<D, T> as Construct>::End>
) -> <UnitDigestConstruct<D, T> as Construct>::Intermediate

fn empty_at<DB>(
    _db: &mut DB,
    _depth_to_bottom: usize
) -> Result<Value<<UnitDigestConstruct<D, T> as Construct>::Intermediate, <UnitDigestConstruct<D, T> as Construct>::End>, <DB as Backend>::Error> where
    DB: WriteBackend<Construct = UnitDigestConstruct<D, T>>, 

impl<D: Digest<OutputSize = U32>> Construct for DigestConstruct<D>

type Intermediate = Intermediate

type End = End

fn intermediate_of(
    left: &ValueOf<Self>,
    right: &ValueOf<Self>
) -> Self::Intermediate

fn empty_at<DB: WriteBackend<Construct = Self>>(
    db: &mut DB,
    depth_to_bottom: usize
) -> Result<ValueOf<Self>, DB::Error>

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