[−][src]Struct gdk_pixbuf::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.
Value
does not implement the Send
trait, but SendValue
can be
used instead.
See the module documentation for more details.
Methods
impl Value
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pub fn from_type(type_: Type) -> Value
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Creates a new Value
that is initialized with type_
pub fn downcast<'a, T>(self) -> Result<TypedValue<T>, Value> where
T: FromValueOptional<'a> + SetValue,
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T: FromValueOptional<'a> + SetValue,
Tries to downcast to a TypedValue
.
Returns Ok(TypedValue<T>)
if the value carries a type corresponding
to T
and Err(self)
otherwise.
pub fn downcast_ref<'a, T>(&self) -> Option<&TypedValue<T>> where
T: FromValueOptional<'a> + SetValue,
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T: FromValueOptional<'a> + SetValue,
Tries to downcast to a &TypedValue
.
Returns Some(&TypedValue<T>)
if the value carries a type corresponding
to T
and None
otherwise.
pub fn get<'a, T>(&'a self) -> Option<T> where
T: FromValueOptional<'a>,
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T: FromValueOptional<'a>,
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.
pub fn is<'a, T>(&self) -> bool where
T: FromValueOptional<'a> + SetValue,
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T: FromValueOptional<'a> + SetValue,
Returns true
if the type of the value corresponds to T
or is a sub-type of T
.
pub fn type_(&self) -> Type
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Returns the type of the value.
pub fn type_transformable(src: Type, dst: Type) -> bool
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Returns whether Value
s of type src
can be transformed to type dst
.
pub fn try_into_send_value<'a, T>(self) -> Result<SendValue, Value> where
T: FromValueOptional<'a> + SetValue + Send,
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T: FromValueOptional<'a> + SetValue + Send,
Trait Implementations
impl FromGlibPtrNone<*const GValue> for Value
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unsafe fn from_glib_none(ptr: *const GValue) -> Value
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impl FromGlibPtrNone<*mut GValue> for Value
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unsafe fn from_glib_none(ptr: *mut GValue) -> Value
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impl Drop for Value
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impl Clone for Value
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fn clone(&self) -> Value
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Uninitialized for Value
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unsafe fn uninitialized() -> Value
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impl Debug for Value
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impl ToValue for Value
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impl<T> From<TypedValue<T>> for Value
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fn from(value: TypedValue<T>) -> Value
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impl From<SendValue> for Value
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impl<'a, T> From<Option<&'a T>> for Value where
T: SetValueOptional + ?Sized,
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T: SetValueOptional + ?Sized,
impl<'a, T> From<&'a T> for Value where
T: SetValue + ?Sized,
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T: SetValue + ?Sized,
impl FromGlibPtrArrayContainerAsVec<*mut GValue, *mut *mut GValue> for Value
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unsafe fn from_glib_none_as_vec(ptr: *mut *mut GValue) -> Vec<Value>
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unsafe fn from_glib_container_as_vec(ptr: *mut *mut GValue) -> Vec<Value>
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unsafe fn from_glib_full_as_vec(ptr: *mut *mut GValue) -> Vec<Value>
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impl FromGlibPtrArrayContainerAsVec<*mut GValue, *const *mut GValue> for Value
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unsafe fn from_glib_none_as_vec(ptr: *const *mut GValue) -> Vec<Value>
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unsafe fn from_glib_container_as_vec(*const *mut GValue) -> Vec<Value>
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unsafe fn from_glib_full_as_vec(*const *mut GValue) -> Vec<Value>
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impl FromGlibContainerAsVec<*mut GValue, *const *mut GValue> for Value
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unsafe fn from_glib_none_num_as_vec(
ptr: *const *mut GValue,
num: usize
) -> Vec<Value>
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ptr: *const *mut GValue,
num: usize
) -> Vec<Value>
unsafe fn from_glib_container_num_as_vec(
*const *mut GValue,
usize
) -> Vec<Value>
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*const *mut GValue,
usize
) -> Vec<Value>
unsafe fn from_glib_full_num_as_vec(*const *mut GValue, usize) -> Vec<Value>
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impl FromGlibContainerAsVec<*mut GValue, *mut *mut GValue> for Value
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unsafe fn from_glib_none_num_as_vec(
ptr: *mut *mut GValue,
num: usize
) -> Vec<Value>
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ptr: *mut *mut GValue,
num: usize
) -> Vec<Value>
unsafe fn from_glib_container_num_as_vec(
ptr: *mut *mut GValue,
num: usize
) -> Vec<Value>
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ptr: *mut *mut GValue,
num: usize
) -> Vec<Value>
unsafe fn from_glib_full_num_as_vec(
ptr: *mut *mut GValue,
num: usize
) -> Vec<Value>
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ptr: *mut *mut GValue,
num: usize
) -> Vec<Value>
impl FromGlibPtrFull<*mut GValue> for Value
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unsafe fn from_glib_full(ptr: *mut GValue) -> Value
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Auto Trait Implementations
Blanket Implementations
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> ToValue for T where
T: SetValue + ?Sized,
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T: SetValue + ?Sized,