Macro async_func

macro_rules! async_func {
    ($($var:ident),*, { $($closure_body:tt)* }) => { ... };
    ($($var:ident),*, |$($closure_param:ident),*| { $($closure_body:tt)* }) => { ... };
}

Creates an asynchronous function that takes a closure with parameters and executes it asynchronously.

This macro generates an asynchronous closure that captures external variables by cloning them, and allows the closure to be invoked with the specified parameters. The body of the closure is executed inside an asynchronous block.

Parameters

• $($var:ident),* : A list of variables from the outer scope to be captured and cloned inside the closure.
• $($closure_param:ident),* : A list of parameters for the closure. These parameters are used when calling the closure.
• { $($closure_body:tt)* } : The body of the closure that is executed asynchronously.

Returns

A closure that takes the specified parameters and returns a Pin<Box<dyn Future<Output = ()> + Send>> which is an asynchronous task that can be awaited.

This macro allows you to encapsulate external state (captured via cloning) and run an asynchronous task with a specified closure.