Trait Contextual

pub trait Contextual {
    type Ctx: RawContext;

    // Required methods
    fn ctx(&self) -> Self::Ctx;
    fn ctx_mut(&mut self) -> &mut Self::Ctx;

    // Provided methods
    fn replace_ctx(&mut self, ctx: Self::Ctx) -> Self::Ctx { ... }
    fn set_ctx(&mut self, ctx: Self::Ctx) -> &mut Self { ... }
    fn swap_ctx(&mut self, other: &mut Self) { ... }
    fn take_ctx(&mut self) -> Self::Ctx
       where Self::Ctx: Default { ... }
}

Contextual is a trait for denoting types that are associated with a particular context.

Required Associated Types

type Ctx: RawContext

Required Methods

fn ctx(&self) -> Self::Ctx

returns an immutable reference to the current context.

fn ctx_mut(&mut self) -> &mut Self::Ctx

returns a mutable reference to the current context

Provided Methods

fn replace_ctx(&mut self, ctx: Self::Ctx) -> Self::Ctx

replace with another and return the previous context

fn set_ctx(&mut self, ctx: Self::Ctx) -> &mut Self

update the current context and return a mutable reference to the instance

fn swap_ctx(&mut self, other: &mut Self)

swap out the context’s of two instances.

fn take_ctx(&mut self) -> Self::Ctx

where Self::Ctx: Default,

take the current context and return it, leaving the default context in its place.

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