Trait SumType

pub trait SumType {
    // Required methods
    fn variant(&self) -> &'static str;
    fn variants(&self) -> &'static [&'static str];
    fn downcast_ref<T: Any>(&self) -> Option<&T>;
    fn downcast_mut<T: Any>(&mut self) -> Option<&mut T>;
    fn variant_is<T: Any>(&self) -> bool;
}

Various methods for introspection and dynamic typing.

Note

This trait is automatically implemented for all types generated by the sum_type!() macro. You should never need to implement it manually.

Required Methods

fn variant(&self) -> &'static str

The name of the current variant.

fn variants(&self) -> &'static [&'static str]

A list of all possible variants.

fn downcast_ref<T: Any>(&self) -> Option<&T>

Try to get a reference to the inner field if it is a T.

fn downcast_mut<T: Any>(&mut self) -> Option<&mut T>

Return a mutable reference to the inner field if it is a T.

fn variant_is<T: Any>(&self) -> bool

Is the underlying variant an instance of T?

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

impl SumType for MySumType