Trait MergeCombineByKey 

pub trait MergeCombineByKey {
    type Elem;

    // Required method
    fn merge_combine_by_key<F, K>(&mut self, template: &Self, get_key: F)
       where F: FnMut(&Self::Elem) -> K,
             K: Hash + Eq;
}

Merge and combine the elements in two containers using a custom function for getting the key that should be used for each element. This allows merging and combining Vec.

Required Associated Types

type Elem

Required Methods

fn merge_combine_by_key<F, K>(&mut self, template: &Self, get_key: F)

where F: FnMut(&Self::Elem) -> K, K: Hash + Eq,

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<T> MergeCombineByKey for Option<T>

where T: MergeCombineByKey + Clone,

type Elem = <T as MergeCombineByKey>::Elem

fn merge_combine_by_key<F, K>(&mut self, template: &Self, get_key: F)

where F: FnMut(&Self::Elem) -> K, K: Hash + Eq,

impl<T> MergeCombineByKey for Vec<T>

where T: Merge + Clone,

type Elem = T

fn merge_combine_by_key<F, K>(&mut self, template: &Self, get_key: F)

where F: FnMut(&Self::Elem) -> K, K: Hash + Eq,

Implementors