Attribute Macro target

#[target]

Define a trait for use of implement macro.

Arguments (all optional)

• alternative … Trait. If specified, implement this trait instead of the target trait itself. The target trait is used only for an argument of implement macro. See implementation of traits.

• newer_type … Set path to newer_type crate. Defaults to ::newer_type. Example: ::your_crate::_export::newer_type.

• implementor … a (uninhabited) struct with one generic argument, used as type_leak’s implementor type. It should be specified when you use types with relative path in the trait definition.

  Example

  use newer_type::target;
  
  #[target]
  trait MyTrait {
      fn my_fn(&self) -> ::core::primitive::usize;
  }

  use newer_type::target;
  
  pub struct Implementor<T>(
      core::marker::PhantomData<T>,
      core::convert::Infallible
  );
  
  type TypeFromContext = usize;
  
  // Implementor should be public to all `MyTrait` users, and thus it should
  // be specified with absolute path (like
  // `::your_crate::path::to::Implementor`).
  #[target(implementor = Implementor)]
  trait MyTrait {
      fn my_fn(&self, t: TypeFromContext) -> Box<usize>;
  }

See ::newet_type::target