Enum Operation 

pub enum Operation<K: Array, V: VariableValue> {
    Set(K, V),
    Commit(Option<V>),
}

An operation applied to an immutable authenticated database.

Unlike mutable database operations, immutable operations only support setting new values and committing - no updates or deletions.

Variants

Set(K, V)

Set a key to a value. The key must not already exist.

Commit(Option<V>)

Commit with optional metadata.

Implementations

impl<K: Array, V: VariableValue> Operation<K, V>

pub const fn key(&self) -> Option<&K>

If this is an operation involving a key, returns the key. Otherwise, returns None.

pub const fn is_commit(&self) -> bool

Returns true if this is a commit operation.

Trait Implementations

impl<K: Clone + Array, V: Clone + VariableValue> Clone for Operation<K, V>

fn clone(&self) -> Operation<K, V>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<K: Debug + Array, V: Debug + VariableValue> Debug for Operation<K, V>

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

Formats the value using the given formatter.

impl<K: Array, V: VariableValue> Display for Operation<K, V>

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

Formats the value using the given formatter.

impl<K: Array, V: VariableValue> EncodeSize for Operation<K, V>

fn encode_size(&self) -> usize

Returns the encoded size of this value (in bytes).

impl<K: Hash + Array, V: Hash + VariableValue> Hash for Operation<K, V>

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<K: Array, V: VariableValue> Operation for Operation<K, V>

type Key = K

The key type for this operation.

fn key(&self) -> Option<&Self::Key>

Returns the key if this operation involves a key, None otherwise.

fn is_delete(&self) -> bool

If this operation deletes its key’s value.

fn is_update(&self) -> bool

If this operation updates its key’s value.

fn has_floor(&self) -> Option<Location>

The inactivity floor location if this operation is a commit operation with a floor value, None otherwise.

impl<K: Ord + Array, V: Ord + VariableValue> Ord for Operation<K, V>

fn cmp(&self, other: &Operation<K, V>) -> 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<K: PartialEq + Array, V: PartialEq + VariableValue> PartialEq for Operation<K, V>

fn eq(&self, other: &Operation<K, V>) -> 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<K: PartialOrd + Array, V: PartialOrd + VariableValue> PartialOrd for Operation<K, V>

fn partial_cmp(&self, other: &Operation<K, V>) -> 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<K: Array, V: VariableValue> Read for Operation<K, V>

type Cfg = <V as Read>::Cfg

The Cfg type parameter allows passing configuration during the read process. This is crucial for safely decoding untrusted data, for example, by providing size limits for collections or strings.

fn read_cfg(buf: &mut impl Buf, cfg: &Self::Cfg) -> Result<Self, CodecError>

Reads a value from the buffer using the provided configuration cfg.

impl<K: Array, V: VariableValue> Write for Operation<K, V>

fn write(&self, buf: &mut impl BufMut)

Writes the binary representation of self to the provided buffer buf.

impl<K: Eq + Array, V: Eq + VariableValue> Eq for Operation<K, V>

impl<K: Array, V: VariableValue> StructuralPartialEq for Operation<K, V>