Trait Atomic

pub trait Atomic: ByteStore {
    // Required methods
    fn atomic_update(
        &self,
        key: &[u8],
        op: impl FnMut(Option<&[u8]>) -> Option<Vec<u8>>,
    ) -> Result<(), Self::DbError>;
    fn conditional_update(
        &self,
        key: &[u8],
        new: &[u8],
        expected: &[u8],
    ) -> Result<(), Self::DbError>;
}

A helper trait, implementing this automatically implements data_store::Atomic

Required Methods

fn atomic_update( &self, key: &[u8], op: impl FnMut(Option<&[u8]>) -> Option<Vec<u8>>, ) -> Result<(), Self::DbError>

returns the old value

fn conditional_update( &self, key: &[u8], new: &[u8], expected: &[u8], ) -> Result<(), Self::DbError>

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.

Implementations on Foreign Types

impl Atomic for Tree

fn atomic_update( &self, key: &[u8], op: impl FnMut(Option<&[u8]>) -> Option<Vec<u8>>, ) -> Result<(), Self::DbError>

fn conditional_update( &self, key: &[u8], new: &[u8], expected: &[u8], ) -> Result<(), Self::DbError>

Implementors

impl Atomic for BTreeMap