Enum TransferKind 

#[non_exhaustive]
pub enum TransferKind {
    SelfTransfer,
    Direct,
    Offer,
    Unknown,
}

How a transfer will be carried out, as the registry decides.

Not a caller’s choice: it follows from whether the receiver has pre-approved direct transfers, and whether sender and receiver are the same party. A client that assumes Direct and gets Offer has a transfer that is pending someone else’s acceptance, which is a different workflow.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

SelfTransfer

Sender and receiver are the same party; no approval, usually immediate.

Direct

The receiver has pre-approved direct transfers, so it completes at once.

Offer

The receiver is offered the transfer and it completes only if accepted.

Unknown

A kind this build does not know.

Without this, a registry that adds a fourth kind makes the whole factory response fail to decode and every transfer stop — including the ones whose kind is perfectly understood. #[non_exhaustive] promises a caller their match will keep compiling; this is what makes the promise reach runtime.

Trait Implementations

impl Clone for TransferKind

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for TransferKind

impl Debug for TransferKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for TransferKind

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for TransferKind

impl PartialEq for TransferKind

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TransferKind