Struct glib::value::Value

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pub struct Value { /* private fields */ }
Expand description

A generic value capable of carrying various types.

Once created the type of the value can’t be changed.

Some types (e.g. String and objects) support None values while others (e.g. numeric types) don’t.

Value does not implement the Send trait, but SendValue can be used instead.

See the module documentation for more details. An opaque structure used to hold different types of values.

The data within the structure has protected scope: it is accessible only to functions within a GTypeValueTable structure, or implementations of the g_value_*() API. That is, code portions which implement new fundamental types.

Value users cannot make any assumptions about how data is stored within the 2 element data union, and the g_type member should only be accessed through the G_VALUE_TYPE() macro.

Implementations§

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impl Value

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pub fn as_ptr(&self) -> *mut GValue

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pub unsafe fn from_glib_ptr_borrow<'a>(ptr: *const GValue) -> &'a Self

Borrows the underlying C value.

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pub unsafe fn from_glib_ptr_borrow_mut<'a>(ptr: *mut GValue) -> &'a mut Self

Borrows the underlying C value mutably.

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impl Value

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pub fn from_type(type_: Type) -> Self

Creates a new Value that is initialized with type_.

Panics

If type_ can’t be stored in a Value this function panics.

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pub unsafe fn from_type_unchecked(type_: Type) -> Self

Creates a new Value that is initialized with type_.

SAFETY

This must be called with a valid type_ that can be stored in Values.

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pub fn for_value_type<T: ValueType>() -> Self

Creates a new Value that is initialized for a given ValueType.

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pub fn get<'a, T>( &'a self ) -> Result<T, <<T as FromValue<'_>>::Checker as ValueTypeChecker>::Error>
where T: FromValue<'a>,

Tries to get a value of type T.

Returns Ok if the type is correct.

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pub fn get_owned<T>( &self ) -> Result<T, <<T as FromValue<'_>>::Checker as ValueTypeChecker>::Error>
where T: for<'b> FromValue<'b> + 'static,

Tries to get a value of an owned type T.

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pub fn is<T: StaticType>(&self) -> bool

Returns true if the type of the value corresponds to T or is a sub-type of T.

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pub fn is_type(&self, type_: Type) -> bool

Returns true if the type of the value corresponds to type_ or is a sub-type of type_.

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pub fn type_(&self) -> Type

Returns the type of the value.

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pub fn type_transformable(src: Type, dst: Type) -> bool

Returns whether Values of type src can be transformed to type dst. Check whether transform() is able to transform values of type src_type into values of type dest_type. Note that for the types to be transformable, they must be compatible or a transformation function must be registered.

src_type

Source type.

dest_type

Target type.

Returns

true if the transformation is possible, false otherwise.

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pub fn transform<T: ValueType>(&self) -> Result<Value, BoolError>

Tries to transform the value into a value of the target type Tries to cast the contents of self into a type appropriate to store in dest_value, e.g. to transform a G_TYPE_INT value into a G_TYPE_FLOAT value. Performing transformations between value types might incur precision lossage. Especially transformations into strings might reveal seemingly arbitrary results and shouldn’t be relied upon for production code (such as rcfile value or object property serialization).

dest_value

Target value.

Returns

Whether a transformation rule was found and could be applied. Upon failing transformations, dest_value is left untouched.

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pub fn transform_with_type(&self, type_: Type) -> Result<Value, BoolError>

Tries to transform the value into a value of the target type

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pub fn into_raw(self) -> GValue

Consumes Value and returns the corresponding GValue.

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pub fn try_into_send_value<T: Send + StaticType>( self ) -> Result<SendValue, Self>

Trait Implementations§

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impl Clone for Value

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Value

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

Formats the value using the given formatter. Read more
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impl Drop for Value

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<'a, T: ?Sized + ToValue> From<&'a T> for Value

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fn from(value: &'a T) -> Self

Converts to this type from the input type.
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impl From<*mut c_void> for Value

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fn from(v: Pointer) -> Self

Converts to this type from the input type.
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impl From<BindingFlags> for Value

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fn from(v: BindingFlags) -> Self

Converts to this type from the input type.
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impl From<Box<str>> for Value

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fn from(s: Box<str>) -> Self

Converts to this type from the input type.
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impl From<BoxedValue> for Value

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fn from(v: BoxedValue) -> Self

Converts to this type from the input type.
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impl From<ByteArray> for Value

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fn from(s: ByteArray) -> Self

Converts to this type from the input type.
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impl From<Bytes> for Value

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fn from(s: Bytes) -> Self

Converts to this type from the input type.
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impl From<Checksum> for Value

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fn from(o: Checksum) -> Self

Converts to this type from the input type.
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impl From<Closure> for Value

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fn from(s: Closure) -> Self

Converts to this type from the input type.
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impl From<ControlFlow> for Value

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fn from(v: ControlFlow) -> Self

Converts to this type from the input type.
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impl From<DateTime> for Value

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fn from(s: DateTime) -> Self

Converts to this type from the input type.
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impl From<Error> for Value

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fn from(o: Error) -> Self

Converts to this type from the input type.
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impl From<GString> for Value

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fn from(s: GString) -> Self

Converts to this type from the input type.
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impl From<ILong> for Value

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fn from(v: ILong) -> Self

Converts to this type from the input type.
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impl From<IOCondition> for Value

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fn from(v: IOCondition) -> Self

Converts to this type from the input type.
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impl From<KeyFile> for Value

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fn from(s: KeyFile) -> Self

Converts to this type from the input type.
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impl From<MainContext> for Value

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fn from(s: MainContext) -> Self

Converts to this type from the input type.
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impl From<MainLoop> for Value

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fn from(s: MainLoop) -> Self

Converts to this type from the input type.
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impl From<MarkupParseContext> for Value

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fn from(s: MarkupParseContext) -> Self

Converts to this type from the input type.
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impl From<NonNull<c_void>> for Value

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fn from(v: NonNull<Pointee>) -> Self

Converts to this type from the input type.
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impl From<NonZeroI32> for Value

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fn from(v: NonZeroI32) -> Self

Converts to this type from the input type.
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impl From<NonZeroI64> for Value

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fn from(v: NonZeroI64) -> Self

Converts to this type from the input type.
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impl From<NonZeroI8> for Value

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fn from(v: NonZeroI8) -> Self

Converts to this type from the input type.
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impl From<NonZeroU32> for Value

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fn from(v: NonZeroU32) -> Self

Converts to this type from the input type.
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impl From<NonZeroU64> for Value

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fn from(v: NonZeroU64) -> Self

Converts to this type from the input type.
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impl From<NonZeroU8> for Value

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fn from(v: NonZeroU8) -> Self

Converts to this type from the input type.
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impl<T: Into<Value> + ToValueOptional> From<Option<T>> for Value

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

Converts to this type from the input type.
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impl From<PathBuf> for Value

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fn from(s: PathBuf) -> Self

Converts to this type from the input type.
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impl From<Propagation> for Value

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fn from(v: Propagation) -> Self

Converts to this type from the input type.
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impl From<SendValue> for Value

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fn from(value: SendValue) -> Self

Converts to this type from the input type.
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impl From<Source> for Value

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fn from(s: Source) -> Self

Converts to this type from the input type.
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impl From<StrV> for Value

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fn from(s: StrV) -> Self

Converts to this type from the input type.
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impl From<String> for Value

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fn from(s: String) -> Self

Converts to this type from the input type.
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impl From<TimeZone> for Value

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fn from(s: TimeZone) -> Self

Converts to this type from the input type.
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impl From<ULong> for Value

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fn from(v: ULong) -> Self

Converts to this type from the input type.
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impl From<Uri> for Value

Available on crate feature v2_66 only.
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fn from(s: Uri) -> Self

Converts to this type from the input type.
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impl From<ValueArray> for Value

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fn from(o: ValueArray) -> Self

Converts to this type from the input type.
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impl From<VariantDict> for Value

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fn from(s: VariantDict) -> Self

Converts to this type from the input type.
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impl From<Vec<GString>> for Value

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fn from(v: Vec<GString>) -> Self

Converts to this type from the input type.
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impl From<Vec<String>> for Value

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fn from(s: Vec<String>) -> Self

Converts to this type from the input type.
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impl From<bool> for Value

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fn from(v: bool) -> Self

Converts to this type from the input type.
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impl From<char> for Value

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fn from(v: char) -> Self

Converts to this type from the input type.
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impl From<f32> for Value

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fn from(v: f32) -> Self

Converts to this type from the input type.
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impl From<f64> for Value

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fn from(v: f64) -> Self

Converts to this type from the input type.
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impl From<i32> for Value

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fn from(v: i32) -> Self

Converts to this type from the input type.
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impl From<i64> for Value

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fn from(v: i64) -> Self

Converts to this type from the input type.
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impl From<i8> for Value

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fn from(v: i8) -> Self

Converts to this type from the input type.
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impl From<u32> for Value

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fn from(v: u32) -> Self

Converts to this type from the input type.
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impl From<u64> for Value

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fn from(v: u64) -> Self

Converts to this type from the input type.
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impl From<u8> for Value

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fn from(v: u8) -> Self

Converts to this type from the input type.
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impl<'a> FromValue<'a> for &'a Value

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type Checker = NopChecker

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

Get the contained value from a Value. Read more
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impl<'a> FromValue<'a> for Value

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type Checker = NopChecker

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

Get the contained value from a Value. Read more
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impl<'a> ToValue for &'a Value

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fn to_value(&self) -> Value

Convert a value to a Value.
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fn value_type(&self) -> Type

Returns the type identifer of self. Read more
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impl ToValue for Value

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fn to_value(&self) -> Value

Convert a value to a Value.
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fn value_type(&self) -> Type

Returns the type identifer of self. Read more

Auto Trait Implementations§

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impl RefUnwindSafe for Value

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impl !Send for Value

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impl !Sync for Value

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impl Unpin for Value

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impl UnwindSafe for Value

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for T

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unsafe fn from_glib_none_num_as_vec(ptr: *const GList, num: usize) -> Vec<T>

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unsafe fn from_glib_container_num_as_vec(_: *const GList, _: usize) -> Vec<T>

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unsafe fn from_glib_full_num_as_vec(_: *const GList, _: usize) -> Vec<T>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for T

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unsafe fn from_glib_none_num_as_vec(ptr: *const GPtrArray, num: usize) -> Vec<T>

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unsafe fn from_glib_container_num_as_vec( _: *const GPtrArray, _: usize ) -> Vec<T>

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unsafe fn from_glib_full_num_as_vec(_: *const GPtrArray, _: usize) -> Vec<T>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for T

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unsafe fn from_glib_none_num_as_vec(ptr: *const GSList, num: usize) -> Vec<T>

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unsafe fn from_glib_container_num_as_vec(_: *const GSList, _: usize) -> Vec<T>

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unsafe fn from_glib_full_num_as_vec(_: *const GSList, _: usize) -> Vec<T>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for T

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unsafe fn from_glib_none_num_as_vec(ptr: *mut GList, num: usize) -> Vec<T>

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unsafe fn from_glib_container_num_as_vec(ptr: *mut GList, num: usize) -> Vec<T>

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unsafe fn from_glib_full_num_as_vec(ptr: *mut GList, num: usize) -> Vec<T>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for T

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unsafe fn from_glib_none_num_as_vec(ptr: *mut GPtrArray, num: usize) -> Vec<T>

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unsafe fn from_glib_container_num_as_vec( ptr: *mut GPtrArray, num: usize ) -> Vec<T>

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unsafe fn from_glib_full_num_as_vec(ptr: *mut GPtrArray, num: usize) -> Vec<T>

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impl<T> FromGlibContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for T

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unsafe fn from_glib_none_num_as_vec(ptr: *mut GSList, num: usize) -> Vec<T>

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unsafe fn from_glib_container_num_as_vec(ptr: *mut GSList, num: usize) -> Vec<T>

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unsafe fn from_glib_full_num_as_vec(ptr: *mut GSList, num: usize) -> Vec<T>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GList> for T

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unsafe fn from_glib_none_as_vec(ptr: *const GList) -> Vec<T>

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unsafe fn from_glib_container_as_vec(_: *const GList) -> Vec<T>

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unsafe fn from_glib_full_as_vec(_: *const GList) -> Vec<T>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GPtrArray> for T

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unsafe fn from_glib_none_as_vec(ptr: *const GPtrArray) -> Vec<T>

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unsafe fn from_glib_container_as_vec(_: *const GPtrArray) -> Vec<T>

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unsafe fn from_glib_full_as_vec(_: *const GPtrArray) -> Vec<T>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *const GSList> for T

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unsafe fn from_glib_none_as_vec(ptr: *const GSList) -> Vec<T>

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unsafe fn from_glib_container_as_vec(_: *const GSList) -> Vec<T>

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unsafe fn from_glib_full_as_vec(_: *const GSList) -> Vec<T>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GList> for T

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unsafe fn from_glib_none_as_vec(ptr: *mut GList) -> Vec<T>

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unsafe fn from_glib_container_as_vec(ptr: *mut GList) -> Vec<T>

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unsafe fn from_glib_full_as_vec(ptr: *mut GList) -> Vec<T>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GPtrArray> for T

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unsafe fn from_glib_none_as_vec(ptr: *mut GPtrArray) -> Vec<T>

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unsafe fn from_glib_container_as_vec(ptr: *mut GPtrArray) -> Vec<T>

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unsafe fn from_glib_full_as_vec(ptr: *mut GPtrArray) -> Vec<T>

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impl<T> FromGlibPtrArrayContainerAsVec<<T as GlibPtrDefault>::GlibType, *mut GSList> for T

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unsafe fn from_glib_none_as_vec(ptr: *mut GSList) -> Vec<T>

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unsafe fn from_glib_container_as_vec(ptr: *mut GSList) -> Vec<T>

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unsafe fn from_glib_full_as_vec(ptr: *mut GSList) -> Vec<T>

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoClosureReturnValue for T
where T: Into<Value>,

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.