Trait objc2::mutability::IsAllowedMutable

pub unsafe trait IsAllowedMutable: Sealed { }

Marker trait for classes that may feasibly be used behind a mutable reference.

This trait exist mostly to disallow using &mut self when declaring classes, since that would be a huge footgun.

This is implemented for classes whose ClassType::Mutability is one of:

• Root
• Mutable
• ImmutableWithMutableSubclass
• MutableWithImmutableSuperclass

Safety

This is a sealed trait, and should not need to be implemented. Open an issue if you know a use-case where this restrition should be lifted!

Implementors

impl IsAllowedMutable for AnyObject

impl<P: ?Sized + IsAllowedMutable> IsAllowedMutable for ProtocolObject<P>

impl<T: ?Sized + ClassType> IsAllowedMutable for T

where T::Mutability: MutabilityIsAllowedMutable,