Struct gtk::Value

pub struct Value(_);

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.

See the module documentation for more details.

Methods

impl Value

fn downcast<T>(self) -> Result<TypedValue<T>, Value> where T: FromValueOptional + SetValue

Tries to downcast to a TypedValue.

Returns Ok(TypedValue<T>) if the value carries a type corresponding to T and Err(self) otherwise.

fn get<T>(&self) -> Option<T> where T: FromValueOptional

Tries to get a value of type T.

Returns Some if the type is correct and the value is not None.

This function doesn't distinguish between type mismatches and correctly typed None values. Use downcast or is for that.

fn is<T>(&self) -> bool where T: FromValueOptional + SetValue

Returns true if the type of the value corresponds to T.

fn type_(&self) -> Type

Returns the type of the value.

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

Returns whether Values of type src can be transformed to type dst.

Trait Implementations

impl Uninitialized for Value

unsafe fn uninitialized() -> Value

Returns an uninitialized value.

impl Drop for Value

fn drop(&mut self)

impl ToValue for Value

fn to_value(&self) -> Value

Returns a Value clone of self.

fn to_value_type(&self) -> Type

Returns the type identifer of self.

impl Debug for Value

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

Formats the value using the given formatter.

impl<'a> ToGlibPtr<'a, *const GValue> for Value

type Storage = &'a Value

fn to_glib_none(&'a self) -> Stash<'a, *const GValue, Value>

Transfer: none.

fn to_glib_container(&'a self) -> Stash<'a, P, Self>

Transfer: container.

fn to_glib_full(&self) -> P

Transfer: full.

impl<'a, T> From<Option<&'a T>> for Value where T: SetValueOptional + ?Sized

fn from(value: Option<&'a T>) -> Value

impl<'a, T> From<&'a T> for Value where T: SetValue + ?Sized

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

impl<T> From<TypedValue<T>> for Value

fn from(value: TypedValue<T>) -> Value

impl<'a> ToGlibPtrMut<'a, *mut GValue> for Value

type Storage = &'a mut Value

fn to_glib_none_mut(&'a mut self) -> StashMut<'a, *mut GValue, Value>

Transfer: none.

impl Clone for Value

fn clone(&self) -> Value

Returns a copy of the value.

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

Performs copy-assignment from source.