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", so this trait is not object safe.

Implementors§