Macro clone

macro_rules! clone {
    ( $( $var:ident ),* => { $($body:tt)* } ) => { ... };
    ( $( $var:ident ),* => async move { $($body:tt)* } ) => { ... };
}

The clone! macro automatically clones the variables passed to it and immediately executes the closure.

This macro simplifies the process of cloning variables and passing them into a closure, while also ensuring the closure is executed right away with the cloned values.

Parameters

• $( $var:ident ),*: A list of variables to be cloned. These variables will be cloned before being passed to the closure. Each variable is cloned individually.
• move |$($arg:ident : $typ:ty),*| $body:block: A closure that takes the cloned variables as arguments. The closure’s parameters should be annotated with types. The closure body will be executed with the cloned values.

Behavior

• The macro first clones the provided variables (s1, s2, etc.).
• It then constructs and immediately calls a move closure, passing the cloned values as arguments.
• The closure is executed right away with the cloned data, ensuring no ownership or borrowing issues.

Notes

This macro is useful for cases where you need to clone values and pass them to a closure, but don’t want to manually clone each value before passing it into the closure.