Struct 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(value_signature: &Signature) -> Self

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

pub fn get<T>(&'a self) -> Result<Option<T>, Error>

where T: ?Sized + TryFrom<&'a Value<'a>>, <T as TryFrom<&'a Value<'a>>>::Error: Into<Error>,

Get the inner value as a concrete type

pub fn signature(&self) -> &Signature

Get the signature of Maybe.

pub fn value_signature(&self) -> &Signature

Get the signature of the potential value in the Maybe.

pub fn try_clone(&self) -> Result<Self, Error>

Attempt to clone self.

Trait Implementations

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

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

Formats the value using the given formatter.

impl Display for Maybe<'_>

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

Formats the value using the given formatter.

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 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> Hash for Maybe<'a>

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<'a> Ord for Maybe<'a>

fn cmp(&self, other: &Maybe<'a>) -> 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<'a> PartialEq for Maybe<'a>

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

fn partial_cmp(&self, other: &Maybe<'a>) -> 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<'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 Maybe<'a>> for Value<'a>

type Error = Error

The type returned in the event of a conversion error.

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

Performs the conversion.

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

type Error = Error

The type returned in the event of a conversion error.

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

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> Eq for Maybe<'a>

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