Struct zvariant::Maybe

pub struct Maybe<'a> { /* private fields */ }

A helper type to wrap Option<T> (GVariant’s Maybe type) in Value.

API is provided to convert from, and to Option<T>.

Implementations

impl<'a> Maybe<'a>

pub fn inner(&self) -> &Option<Value<'a>>

Get a reference to underlying value.

pub fn just(value: Value<'a>) -> Self

Create a new Just (Some) Maybe.

pub fn nothing<'s: 'a>(value_signature: Signature<'s>) -> Self

Create a new Nothing (None) Maybe, given the signature of the type.

pub fn get<T>(self) -> Result<Option<T>, Error>where T: TryFrom<Value<'a>>,

Get the inner value as a concrete type

pub fn signature(&self) -> Signature<'static>

Get the signature of Maybe.

NB: This method potentially allocates and copies. Use full_signature if you’d like to avoid that.

pub fn full_signature(&self) -> &Signature<'_>

Get the signature of Maybe.

pub fn value_signature(&self) -> &Signature<'_>

Get the signature of the potential value in the Maybe.

Trait Implementations

impl<'a> Clone for Maybe<'a>

fn clone(&self) -> Maybe<'a>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for Maybe<'a>

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

Formats the value using the given formatter.

impl<'a> From<&'a Maybe<'a>> for Value<'a>

fn from(v: &'a Maybe<'a>) -> Self

Converts to this type from the input type.

impl<'a, T> From<&Option<T>> for Maybe<'a>where T: Type + Into<Value<'a>> + Clone,

fn from(value: &Option<T>) -> Self

Converts to this type from the input type.

impl<'a> From<Maybe<'a>> for OwnedValue

fn from(v: Maybe<'a>) -> Self

Converts to this type from the input type.

impl<'a> From<Maybe<'a>> for Value<'a>

fn from(v: Maybe<'a>) -> Self

Converts to this type from the input type.

impl<'a, T> From<Option<T>> for Maybe<'a>where T: Type + Into<Value<'a>>,

fn from(value: Option<T>) -> Self

Converts to this type from the input type.

impl<'a> PartialEq<Maybe<'a>> for Maybe<'a>

fn eq(&self, other: &Maybe<'a>) -> 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<'a> Serialize for Maybe<'a>

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>where S: Serializer,

Serialize this value into the given Serde serializer.

impl<'a> TryFrom<&'a OwnedValue> for &'a Maybe<'a>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(v: &'a OwnedValue) -> Result<Self, Self::Error>

Performs the conversion.

impl<'a> TryFrom<&'a Value<'a>> for &'a Maybe<'a>

type Error = Error

The type returned in the event of a conversion error.

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

Performs the conversion.

impl<'a> TryFrom<&'a Value<'a>> for Maybe<'a>

type Error = Error

The type returned in the event of a conversion error.

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

Performs the conversion.

impl TryFrom<OwnedValue> for Maybe<'static>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(v: OwnedValue) -> Result<Self, Self::Error>

Performs the conversion.

impl<'a> TryFrom<Value<'a>> for Maybe<'a>

type Error = Error

The type returned in the event of a conversion error.

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

Performs the conversion.

impl<'a> StructuralPartialEq for Maybe<'a>