card_est_array::traits

Trait MergeEstimationLogic

Source 
pub trait MergeEstimationLogic: EstimationLogic {
    type Helper;

    // Required methods
    fn new_helper(&self) -> Self::Helper;
    fn merge_with_helper(
        &self,
        dst: &mut Self::Backend,
        src: &Self::Backend,
        helper: &mut Self::Helper,
    );

    // Provided method
    fn merge(&self, dst: &mut Self::Backend, src: &Self::Backend) { ... }
}
Expand description

An extension of EstimationLogic providing methods to merge backends.

Some kind of estimators make available a merge operation, which, given two estimators, returns an estimator with the same state one would obtain by adding to an empty estimator all the elements added to the two estimators, computing, in practice, a set union.

Required Associated Types§

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type Helper

The type of the helper use in merge calculations.

Merge calculation might require temporary allocations. To mitigate excessive allocation, it is possible to obtain a helper and reusing it for several merge operations

Required Methods§

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fn new_helper(&self) -> Self::Helper

Creates a new helper to use in merge operations.

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fn merge_with_helper( &self, dst: &mut Self::Backend, src: &Self::Backend, helper: &mut Self::Helper, )

Merges src into dst using the provided helper to avoid allocations.

Provided Methods§

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fn merge(&self, dst: &mut Self::Backend, src: &Self::Backend)

Merges src into dst.

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§