pub struct MutNullableDom<T: DomObject> {
    ptr: UnsafeCell<Option<Dom<T>>>,
}
Expand description

A holder that provides interior mutability for GC-managed values such as Dom<T>, with nullability represented by an enclosing Option wrapper. Essentially a Cell<Option<Dom<T>>>, but safer.

This should only be used as a field in other DOM objects; see warning on Dom<T>.

Fields

ptr: UnsafeCell<Option<Dom<T>>>

Implementations

Create a new MutNullableDom.

Retrieve a copy of the current inner value. If it is None, it is initialized with the result of cb first.

Retrieve a copy of the inner optional Dom<T> as LayoutDom<T>. For use by layout, which can’t use safe types like Temporary.

Get a rooted value out of this object

Set this MutNullableDom to the given value.

Gets the current value out of this object and sets it to None.

Trait Implementations

Returns the “default value” for a type. Read more
Trace self.
Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Instruments this type with the current Span, returning an Instrumented wrapper. Read more
Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

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

Convert
Convert
The alignment of pointer.
The type for initializers.
Initializes a with the given initializer. Read more
Dereferences the given pointer. Read more
Mutably dereferences the given pointer. Read more
Drops the object pointed to by the given pointer. Read more
Read this value from the supplied reader. Same as ReadEndian::read_from_little_endian().
Read this value from the supplied reader. Same as ReadEndian::read_from_big_endian().
Read this value from the supplied reader. Same as ReadEndian::read_from_native_endian().
Should always be Self
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.
Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more