Struct TopicFilter 

#[repr(transparent)]
pub struct TopicFilter(MqttStr);

A validated, borrowed MQTT topic filter.

Topic filters are used in SUBSCRIBE / UNSUBSCRIBE packets and may contain the single-level wildcard + and the multi-level wildcard #. The filter must not be empty and must satisfy MqttStr constraints.

This is an unsized type like str. Use &TopicFilter for borrowed references and TopicFilterBuf for owned values.

Tuple Fields

0: MqttStr

Implementations

impl TopicFilter

pub const unsafe fn new_unchecked(s: &MqttStr) -> &Self

Create a topic filter without validating filter-specific invariants.

Safety

The caller must guarantee that s satisfies the topic filter invariants: non-empty, valid wildcard placement, and valid MqttStr.

pub const fn new(s: &MqttStr) -> Result<&Self, TopicError>

Validate and create a new topic filter from a validated MqttStr.

Errors

Returns TopicError if the string is empty or has invalid wildcard placement.

pub const fn as_mqtt_str(&self) -> &MqttStr

Views the topic filter as an MqttStr.

pub const fn as_str(&self) -> &str

Views the topic filter as a string slice.

Trait Implementations

impl AsRef<MqttStr> for TopicFilter

fn as_ref(&self) -> &MqttStr

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<TopicFilter> for TopicFilterBuf

Available on crate feature alloc only.

fn as_ref(&self) -> &TopicFilter

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<str> for TopicFilter

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Borrow<TopicFilter> for TopicFilterBuf

Available on crate feature alloc only.

fn borrow(&self) -> &TopicFilter

Immutably borrows from an owned value.

impl Debug for TopicFilter

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

Formats the value using the given formatter.

impl Display for TopicFilter

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

Formats the value using the given formatter.

impl From<&TopicFilter> for TopicFilterBuf

Available on crate feature alloc only.

fn from(value: &TopicFilter) -> Self

Converts to this type from the input type.

impl Hash for TopicFilter

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

Feeds this value into the given Hasher.

impl PartialEq for TopicFilter

fn eq(&self, other: &TopicFilter) -> 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 ToOwned for TopicFilter

Available on crate feature alloc only.

type Owned = TopicFilterBuf

The resulting type after obtaining ownership.

fn to_owned(&self) -> Self::Owned

Creates owned data from borrowed data, usually by cloning.

fn clone_into(&self, target: &mut Self::Owned)

Uses borrowed data to replace owned data, usually by cloning.

impl<'a> TryFrom<&'a str> for &'a TopicFilter

type Error = ParseTopicError

The type returned in the event of a conversion error.

fn try_from(value: &'a str) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for TopicFilter

impl StructuralPartialEq for TopicFilter