Macro repr_impl

macro_rules! repr_impl {
    ($repr:ty { $($msg:ty : ( $lift:expr, $pattern:pat => $x:expr ) ),+ }) => { ... };
}

The repr_impl macro creates Repr implementations for a type used on the wire, for each protocol message type enumerated in the call.

The macro call consists of <wrapper-type-name>, followed by lines of: <raw-type-name>: ( <fn-raw-to-repr> , <pattern-match-repr> => <captured-raw> ).

Example

use async_session_types::*;

struct Foo(pub u8);
struct Bar(pub String);
enum Message {
  Foo(Foo),
  Bar(Bar),
}

repr_impl! {
  Message {
    Foo: ( Message::Foo, Message::Foo(x) => x ),
    Bar: ( |x| Message::Bar(x), Message::Bar(x) => x )
  }
}

Note that there’s no comma after the last item!