Struct PreparedQuery

pub struct PreparedQuery<Q>
where
    Q: Query,
{ /* private fields */ }

A prepared query can be stored independently of the World to amortize query set-up costs.

Implementations

impl<Q> PreparedQuery<Q>

where Q: Query,

pub fn new() -> PreparedQuery<Q>

Create a prepared query which is not yet attached to any world

pub fn query<'q>(&'q mut self, world: &'q World) -> PreparedQueryBorrow<'q, Q>

Query world, using dynamic borrow checking

This will panic if it would violate an existing unique reference or construct an invalid unique reference.

pub fn query_mut<'q>( &'q mut self, world: &'q mut World, ) -> PreparedQueryIter<'q, Q>

Query a uniquely borrowed world

Avoids the cost of the dynamic borrow checking performed by query.

pub fn view_mut<'q>(&'q mut self, world: &'q mut World) -> PreparedView<'q, Q>

Provide random access to query results for a uniquely borrow world

Trait Implementations

impl<Q> Default for PreparedQuery<Q>

where Q: Query,

fn default() -> PreparedQuery<Q>

Returns the “default value” for a type.