Trait MayContain

pub trait MayContain<T> {
    // Required method
    fn upcast_into(other: T) -> Box<Self>;
}

Declare that T may be held by Box<Self>

This trait is used to constrain which types can be put in Xso<Self>. It is typically implemented on dyn Trait for all T: Trait.

To automatically generate suitable implementations of this trait, see derive_dyn_traits.

Implementation-wise, this trait is very similar to Box<Self>: From<T>. However, From is also used in many different circumstances and it cannot be suitably overloaded on Box<_>, so a new trait was introduced for this particular purpose.

Required Methods

fn upcast_into(other: T) -> Box<Self>

Convert a value of T into Box<Self>.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors