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remove lifetime param in storage trait (#5046)

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robinsdan
2023-10-17 21:30:50 +08:00
committed by GitHub
parent d3ea66bb79
commit ede8278916
29 changed files with 212 additions and 303 deletions
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10
docs/crates/db.md
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@ -145,9 +145,9 @@ The `Database` trait also implements the `DatabaseGAT` trait which defines two a
/// Sealed trait which cannot be implemented by 3rd parties, exposed only for implementers
pub trait DatabaseGAT<'a, __ImplicitBounds: Sealed = Bounds<&'a Self>>: Send + Sync {
/// RO database transaction
type TX: DbTx<'a> + Send + Sync;
type TX: DbTx + Send + Sync;
/// RW database transaction
type TXMut: DbTxMut<'a> + DbTx<'a> + Send + Sync;
type TXMut: DbTxMut + DbTx + Send + Sync;
}
```
@ -161,7 +161,7 @@ The `TX` type can be any type that implements the `DbTx` trait, which provides a
```rust ignore
/// Read only transaction
pub trait DbTx<'tx>: for<'a> DbTxGAT<'a> {
pub trait DbTx: for<'a> DbTxGAT<'a> {
/// Get value
fn get<T: Table>(&self, key: T::Key) -> Result<Option<T::Value>, Error>;
/// Commit for read only transaction will consume and free transaction and allows
@ -180,7 +180,7 @@ The `TXMut` type can be any type that implements the `DbTxMut` trait, which prov
```rust ignore
/// Read write transaction that allows writing to database
pub trait DbTxMut<'tx>: for<'a> DbTxMutGAT<'a> {
pub trait DbTxMut: for<'a> DbTxMutGAT<'a> {
/// Put value to database
fn put<T: Table>(&self, key: T::Key, value: T::Value) -> Result<(), Error>;
/// Delete value from database
@ -227,7 +227,7 @@ impl<'a, DB: Database> Deref for Transaction<'a, DB> {
}
```
The `Transaction` struct implements the `Deref` trait, which returns a reference to its `tx` field, which is a `TxMut`. Recall that `TxMut` is a generic type on the `DatabaseGAT` trait, which is defined as `type TXMut: DbTxMut<'a> + DbTx<'a> + Send + Sync;`, giving it access to all of the functions available to `DbTx`, including the `DbTx::get()` function.
The `Transaction` struct implements the `Deref` trait, which returns a reference to its `tx` field, which is a `TxMut`. Recall that `TxMut` is a generic type on the `DatabaseGAT` trait, which is defined as `type TXMut: DbTxMut + DbTx + Send + Sync;`, giving it access to all of the functions available to `DbTx`, including the `DbTx::get()` function.
Notice that the function uses a [turbofish](https://techblog.tonsser.com/posts/what-is-rusts-turbofish) to define which table to use when passing in the `key` to the `DbTx::get()` function. Taking a quick look at the function definition, a generic `T` is defined that implements the `Table` trait mentioned at the beginning of this chapter.