Struct spacetimedb_table::indexes::RowHash

pub struct RowHash(pub u64);

The content hash of a row.

Notes:

• The hash is not cryptographically secure.

• The hash is valid only for the lifetime of a Table. This entails that it should not be persisted to disk or used as a stable identifier over the network. For example, the hashing algorithm could be different on different machines based on availability of hardware instructions. Moreover, due to random seeds, when restarting from disk, the hashes may be different for the same rows.

Tuple Fields

0: u64

Implementations

impl RowHash

pub fn hasher_builder() -> RandomState

Returns a Hasher builder that yields the type of hashes that RowHash stores.

Trait Implementations

impl Clone for RowHash

fn clone(&self) -> RowHash

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RowHash

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

Formats the value using the given formatter.

impl Hash for RowHash

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 RowHash

fn cmp(&self, other: &RowHash) -> 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 + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for RowHash

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for RowHash

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl Copy for RowHash

impl Eq for RowHash

impl StructuralPartialEq for RowHash

impl IsEnabled for RowHash

RowHash is already a hash, so no need to hash again.