Macro topics

macro_rules! topics {
    (@tp_tys ( $dir:expr ) $([[$($meta:meta)?] $tp_name:ident])*) => { ... };
    (@tp_tys ( $dir:expr ) omit_std=true; $([[$($meta:meta)?] $tp_name:ident])*) => { ... };
    (@tp_tys ( $dir:expr ) omit_std=false; $([[$($meta:meta)?] $tp_name:ident])*) => { ... };
    (@tp_tps ( $dir:expr ) $([[$($meta:meta)?] $tp_name:ident])*) => { ... };
    (@tp_tps ( $dir:expr ) omit_std=true; $([[$($meta:meta)?] $tp_name:ident])*) => { ... };
    (@tp_tps ( $dir:expr ) omit_std=false; $([[$($meta:meta)?] $tp_name:ident])*) => { ... };
    (
        list = $list_name:ident;
        direction = $direction:expr;
        $(omit_std = $omit:tt;)?
        | TopicTy        | MessageTy                                | Path              | $( Cfg           |)?
        | $(-)*          | $(-)*                                    | $(-)*             | $($(-)*          |)?
      $(| $tp_name:ident | $msg_ty:tt $(< $($msg_lt:lifetime),+ >)? | $path_str:literal | $($meta:meta)? $(|)?)*
    ) => { ... };
}

Topics macro

Used to define multiple Topic marker types that implements the Topic trait.

use postcard_rpc::{topics, TopicDirection};

#[derive(Debug, Serialize, Deserialize, Schema)]
pub struct Message1 {
    a: u8,
    b: u64,
}

#[derive(Debug, Serialize, Deserialize, Schema)]
pub struct Message2 {
    a: i8,
    b: i64,
}

topics!{
   list = TOPIC_LIST_NAME;
   direction = TopicDirection::ToServer;
   | TopicTy        | MessageTy     | Path              |
   | -------        | ---------     | ----              |
   | Topic1         | Message1      | "topics/one"      |
   | Topic2         | Message2      | "topics/two"      |
}