Enum Variable 

pub enum Variable<K: Array, V: Codec> {
    Set(K, V),
    Commit(Option<V>),
    Delete(K),
    Update(K, V),
    CommitFloor(Option<V>, u64),
}

An operation applied to an authenticated database with a variable size value.

Variants

Set(K, V)

Commit(Option<V>)

Delete(K)

Update(K, V)

CommitFloor(Option<V>, u64)

Implementations

impl<K: Array, V: Codec> Variable<K, V>

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

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

pub fn value(&self) -> Option<&V>

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

pub fn into_value(self) -> Option<V>

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

Trait Implementations

impl<K: Clone + Array, V: Clone + Codec> Clone for Variable<K, V>

fn clone(&self) -> Variable<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 + Codec> Debug for Variable<K, V>

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

Formats the value using the given formatter.

impl<K: Array, V: Codec> Display for Variable<K, V>

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

Formats the value using the given formatter.

impl<K: Array, V: Codec> EncodeSize for Variable<K, V>

fn encode_size(&self) -> usize

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

impl<K: Hash + Array, V: Hash + Codec> Hash for Variable<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: Ord + Array, V: Ord + Codec> Ord for Variable<K, V>

fn cmp(&self, other: &Variable<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 + Codec> PartialEq for Variable<K, V>

fn eq(&self, other: &Variable<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 + Codec> PartialOrd for Variable<K, V>

fn partial_cmp(&self, other: &Variable<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: Codec> Read for Variable<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: Codec> Write for Variable<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 + Codec> Eq for Variable<K, V>

impl<K: Array, V: Codec> StructuralPartialEq for Variable<K, V>