Trait sum_type::SumType[−][src]

pub trait SumType {
    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?

Implementors

impl SumType for MySumType
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