Trait HeaderSource 

pub trait HeaderSource {
    type Position;

    // Required method
    fn into_position(self) -> Self::Position;
}

What may fill the headers position of a publish: a borrowed contract value, or an already-built HeaderMap.

The two differ in what they say about the message, not in how they are written: a borrowed value is the message’s declared contract, serialized one entry per field, while a map is the transport level and stands for no contract at all (a message type declaring one still demands its value). Which of the two a call site passed rides in the type, so with_headers is one method and the contract check stays a compile error either way.

You never implement it: HeaderMap and &H of every serializable H already do.

Required Associated Types

type Position

The headers position this source resolves to: TypedHeaders or MapHeaders.

Required Methods

fn into_position(self) -> Self::Position

Moves the source into its position.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<'a, H: ?Sized> HeaderSource for &'a H

type Position = TypedHeaders<'a, H>

fn into_position(self) -> Self::Position

Implementors

impl HeaderSource for HeaderMap

type Position = MapHeaders