Trait Discriminator 

pub trait Discriminator {
    const DISCRIMINATOR: &'static [u8];
}

Unique identifier for a type.

This is not a trait you should derive manually, as various Anchor macros already derive it internally.

Prior to Anchor v0.31, discriminators were always 8 bytes in size. However, starting with Anchor v0.31, it is possible to override the default discriminators, and discriminator length is no longer fixed, which means this trait can also be implemented for non-Anchor programs.

It’s important that the discriminator is always unique for the type you’re implementing it for. While the discriminator can be at any length (including zero), the IDL generation does not currently allow empty discriminators for safety and convenience reasons. However, the trait definition still allows empty discriminators because some non-Anchor programs, e.g. the SPL Token program, don’t have account discriminators. In that case, safety checks should never depend on the discriminator.

Required Associated Constants

const DISCRIMINATOR: &'static [u8]

Discriminator slice.

See Discriminator trait documentation for more information.

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

impl Discriminator for BatchAppend

const DISCRIMINATOR: &'static [u8]

impl Discriminator for BatchNullify

const DISCRIMINATOR: &'static [u8]

impl Discriminator for BatchUpdateAddressTree

const DISCRIMINATOR: &'static [u8]

impl Discriminator for DeregisterProgram

const DISCRIMINATOR: &'static [u8]

impl Discriminator for InitializeAddressMerkleTreeAndQueue

const DISCRIMINATOR: &'static [u8]

impl Discriminator for InitializeBatchedAddressMerkleTree

const DISCRIMINATOR: &'static [u8]

impl Discriminator for InitializeBatchedStateMerkleTree

const DISCRIMINATOR: &'static [u8]

impl Discriminator for InitializeGroupAuthority

const DISCRIMINATOR: &'static [u8]

impl Discriminator for InitializeStateMerkleTreeAndNullifierQueue

const DISCRIMINATOR: &'static [u8]

impl Discriminator for InsertIntoQueues

const DISCRIMINATOR: &'static [u8]

impl Discriminator for MigrateState

const DISCRIMINATOR: &'static [u8]

impl Discriminator for NullifyLeaves

const DISCRIMINATOR: &'static [u8]

impl Discriminator for RegisterProgramToGroup

const DISCRIMINATOR: &'static [u8]

impl Discriminator for ResizeRegisteredProgramPda

const DISCRIMINATOR: &'static [u8]

impl Discriminator for RolloverAddressMerkleTreeAndQueue

const DISCRIMINATOR: &'static [u8]

impl Discriminator for RolloverBatchedAddressMerkleTree

const DISCRIMINATOR: &'static [u8]

impl Discriminator for RolloverBatchedStateMerkleTree

const DISCRIMINATOR: &'static [u8]

impl Discriminator for RolloverStateMerkleTreeAndNullifierQueue

const DISCRIMINATOR: &'static [u8]

impl Discriminator for UpdateAddressMerkleTree

const DISCRIMINATOR: &'static [u8]

impl Discriminator for UpdateGroupAuthority

const DISCRIMINATOR: &'static [u8]

impl Discriminator for RegisteredProgram

const DISCRIMINATOR: &'static [u8]

impl Discriminator for RegisteredProgramV1

const DISCRIMINATOR: &'static [u8]

impl Discriminator for AddressMerkleTreeAccount

const DISCRIMINATOR: &'static [u8]

impl Discriminator for GroupAuthority

const DISCRIMINATOR: &'static [u8]

impl Discriminator for StateMerkleTreeAccount

const DISCRIMINATOR: &'static [u8]

impl Discriminator for QueueAccount

const DISCRIMINATOR: &'static [u8]

impl Discriminator for ProgramData

const DISCRIMINATOR: &'static [u8]