Enum gio::PollableReturn

#[non_exhaustive]
pub enum PollableReturn {
    Failed,
    Ok,
    WouldBlock,
}

Available on crate feature v2_60 only.

Return value for various IO operations that signal errors via the return value and not necessarily via a #GError.

This enum exists to be able to return errors to callers without having to allocate a #GError. Allocating #GErrors can be quite expensive for regularly happening errors like IOErrorEnum::WouldBlock.

In case of Failed a #GError should be set for the operation to give details about the error that happened.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Failed

Generic error condition for when an operation fails.

Ok

The operation was successfully finished.

WouldBlock

The operation would block.

Trait Implementations

impl Clone for PollableReturn

fn clone(&self) -> PollableReturn

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PollableReturn

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

Formats the value using the given formatter.

impl From<PollableReturn> for Value

fn from(v: PollableReturn) -> Self

Converts to this type from the input type.

impl<'a> FromValue<'a> for PollableReturn

type Checker = GenericValueTypeChecker<PollableReturn>

Value type checker.

unsafe fn from_value(value: &'a Value) -> Self

Get the contained value from a Value.

impl HasParamSpec for PollableReturn

type ParamSpec = ParamSpecEnum

type SetValue = PollableReturn

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str, _: PollableReturn) -> ParamSpecEnumBuilder<'_, PollableReturn>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for PollableReturn

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 PollableReturn

fn cmp(&self, other: &PollableReturn) -> 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 PollableReturn

fn eq(&self, other: &PollableReturn) -> 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 PollableReturn

fn partial_cmp(&self, other: &PollableReturn) -> 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 StaticType for PollableReturn

fn static_type() -> Type

Returns the type identifier of Self.

impl ToValue for PollableReturn

fn to_value(&self) -> Value

Convert a value to a Value.

fn value_type(&self) -> Type

Returns the type identifier of self.

impl ValueType for PollableReturn

type Type = PollableReturn

Type to get the Type from.

impl Copy for PollableReturn

impl Eq for PollableReturn

impl StructuralPartialEq for PollableReturn