#[repr(transparent)]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.
Implementations
sourceimpl Value
impl Value
sourcepub fn for_value_type<T: ValueType>() -> Self
pub fn for_value_type<T: ValueType>() -> Self
Creates a new Value that is initialized for a given ValueType.
sourcepub fn get<'a, T>(
&'a self
) -> Result<T, <<T as FromValue<'_>>::Checker as ValueTypeChecker>::Error> where
T: FromValue<'a>,
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.
sourcepub fn get_owned<T>(
&self
) -> Result<T, <<T as FromValue<'_>>::Checker as ValueTypeChecker>::Error> where
T: for<'b> FromValue<'b> + 'static,
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.
sourcepub fn is<T: StaticType>(&self) -> bool
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.
sourcepub fn is_type(&self, type_: Type) -> bool
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_.
sourcepub fn type_transformable(src: Type, dst: Type) -> bool
pub fn type_transformable(src: Type, dst: Type) -> bool
Returns whether Values of type src can be transformed to type dst.
sourcepub fn transform<T: ValueType>(&self) -> Result<Value, BoolError>
pub fn transform<T: ValueType>(&self) -> Result<Value, BoolError>
Tries to transform the value into a value of the target type
sourcepub fn transform_with_type(&self, type_: Type) -> Result<Value, BoolError>
pub fn transform_with_type(&self, type_: Type) -> Result<Value, BoolError>
Tries to transform the value into a value of the target type
pub fn try_into_send_value<T: Send + StaticType>(
self
) -> Result<SendValue, Self>
Trait Implementations
sourceimpl<'a> FromValue<'a> for Value
impl<'a> FromValue<'a> for Value
type Checker = NopChecker
type Checker = NopChecker
Value type checker.
sourceunsafe fn from_value(value: &'a Value) -> Self
unsafe fn from_value(value: &'a Value) -> Self
Get the contained value from a Value. Read more
sourceimpl<'a> FromValue<'a> for &'a Value
impl<'a> FromValue<'a> for &'a Value
type Checker = NopChecker
type Checker = NopChecker
Value type checker.
sourceunsafe fn from_value(value: &'a Value) -> Self
unsafe fn from_value(value: &'a Value) -> Self
Get the contained value from a Value. Read more
Auto Trait Implementations
impl RefUnwindSafe for Value
impl !Send for Value
impl !Sync for Value
impl Unpin for Value
impl UnwindSafe for Value
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToClosureReturnValue for T where
T: ToValue,
impl<T> ToClosureReturnValue for T where
T: ToValue,
fn to_closure_return_value(&self) -> Option<Value>
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into)Uses borrowed data to replace owned data, usually by cloning. Read more