Trait QueryBase

pub trait QueryBase:
    Debug
    + Default
    + Sized {
    type Key: Clone + Debug + Hash + Eq;
    type Value: Clone + Debug;
    type Storage;
    type Group: QueryGroup<GroupStorage = Self::GroupStorage>;
    type GroupStorage;

    const QUERY_INDEX: u16;
    const QUERY_NAME: &'static str;

    // Required method
    fn query_storage<'a>(
        group_storage: &'a Self::GroupStorage,
    ) -> &'a Arc<Self::Storage>;
}

Trait implements by all of the “special types” associated with each of your queries.

Required Associated Constants

const QUERY_INDEX: u16

A unique index identifying this query within the group.

const QUERY_NAME: &'static str

Name of the query method (e.g., foo)

Required Associated Types

type Key: Clone + Debug + Hash + Eq

Type that you you give as a parameter – for queries with zero or more than one input, this will be a tuple.

type Value: Clone + Debug

What value does the query return?

type Storage

Internal struct storing the values for the query.

type Group: QueryGroup<GroupStorage = Self::GroupStorage>

Associate query group struct.

type GroupStorage

Generated struct that contains storage for all queries in a group.

Required Methods

fn query_storage<'a>( group_storage: &'a Self::GroupStorage, ) -> &'a Arc<Self::Storage>

Extact storage for this query from the storage for its group.

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