Struct TxFunction 

pub struct TxFunction {
    pub op: PlainSymbol,
}

A “transaction function” that exposes some value determined by the current transaction. The prototypical example is the current transaction ID, (transaction-tx).

A natural next step might be to expose the current transaction instant (transaction-instant), but that’s more difficult: the transaction itself can set the transaction instant (with some restrictions), so the transaction function must be late-binding. Right now, that’s difficult to arrange in the transactor.

In the future, we might accept arguments; for example, perhaps we might expose (ancestor (transaction-tx) n) to find the n-th ancestor of the current transaction. If we do accept arguments, then the special case of (lookup-ref a v) should be handled as part of the generalization.

Fields

op: PlainSymbol

Trait Implementations

impl Clone for TxFunction

fn clone(&self) -> TxFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TxFunction

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

Formats the value using the given formatter.

impl Eq for TxFunction

impl<V: TransactableValueMarker> From<TxFunction> for ValuePlace<V>

fn from(v: TxFunction) -> Self

Converts to this type from the input type.

impl<V: TransactableValueMarker> From<TxFunction> for EntityPlace<V>

fn from(v: TxFunction) -> Self

Converts to this type from the input type.

impl Hash for TxFunction

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for TxFunction

fn cmp(&self, other: &TxFunction) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for TxFunction

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for TxFunction

fn partial_cmp(&self, other: &TxFunction) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for TxFunction