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KeyIterableByKeyMap

gear_common::storage

Trait KeyIterableByKeyMap 

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pub trait KeyIterableByKeyMap {
    type Key1;
    type Key2;
    type DrainIter: Iterator<Item = Self::Key2>;
    type Iter: Iterator<Item = Self::Key2>;

    // Required methods
    fn drain_prefix_keys(key: Self::Key1) -> Self::DrainIter;
    fn iter_prefix_keys(key: Self::Key1) -> Self::Iter;
}
Expand description

Represents iterable over second keys logic for double key maps (Key1 -> Key2 -> Value).

Returns the iterators over specified (associated) type of the second map keys by given first key.

Required Associated Types§

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type Key1

Map’s first key type.

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type Key2

Map’s second key type.

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type DrainIter: Iterator<Item = Self::Key2>

Removal iterator type.

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type Iter: Iterator<Item = Self::Key2>

Getting iterator type.

Required Methods§

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fn drain_prefix_keys(key: Self::Key1) -> Self::DrainIter

Creates the removal iterator over double map Items.

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fn iter_prefix_keys(key: Self::Key1) -> Self::Iter

Creates the getting iterator over double map Items.

Dyn Compatibility§

This trait is not dyn compatible.

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

Implementors§