Struct Properties 

pub struct Properties { /* private fields */ }

A typed, owned property bag for one subject.

Performance

get/require are O(log property count); value is O(log property count).

Implementations

impl Properties

pub fn get<T: ValueType, V: Readable<T>>(&self, key: Key<T>) -> Option<V>

Reads a typed property, or None when absent or type-mismatched.

Performance

This method is O(log property count) (plus O(value length) for text).

pub fn require<T: ValueType, V: Readable<T>>( &self, key: Key<T>, ) -> Result<V, DbError>

Reads a required typed property.

Errors

Returns DbError::MissingProperty when the property is absent.

Performance

This method is O(log property count).

pub fn value(&self, key: PropertyKeyId) -> Option<&PropertyValue>

Returns the raw value for an untyped key.

Performance

This method is O(log property count).

pub fn len(&self) -> usize

Returns the number of visible properties.

Performance

This method is O(1).

pub fn is_empty(&self) -> bool

Returns whether there are no visible properties.

Performance

This method is O(1).

pub fn iter(&self) -> impl Iterator<Item = (PropertyKeyId, &PropertyValue)>

Iterates (key, value) pairs in ascending key order.

Performance

Iteration is O(property count).

Trait Implementations

impl Clone for Properties

fn clone(&self) -> Properties

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Properties

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

Formats the value using the given formatter.

impl Default for Properties

fn default() -> Properties

Returns the “default value” for a type.

impl Eq for Properties

impl PartialEq for Properties

fn eq(&self, other: &Properties) -> 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 StructuralPartialEq for Properties