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Implement Send and Sync for PreparedQuery #445

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Implement Send and Sync for PreparedQuery #445

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8 changes: 8 additions & 0 deletions src/query.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1171,6 +1171,14 @@ pub struct PreparedQuery<Q: Query> {
fetch: Box<[Option<Q::Fetch>]>,
}

// Safety: `Fetch::State` is `Send`, and cached fetches encode access to query
// items, which this bound permits transferring between threads.
unsafe impl<Q: Query> Send for PreparedQuery<Q> where for<'a> Q::Item<'a>: Send {}

// Safety: `Fetch::State` is `Sync`, and cached fetches cannot be accessed
// through a shared reference because every such method requires `&mut self`.
unsafe impl<Q: Query> Sync for PreparedQuery<Q> {}

impl<Q: Query> Default for PreparedQuery<Q> {
fn default() -> Self {
Self::new()
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