Crate closure_capture

When using the move keyword, all external variables used in the closure will be moved into the closure.

Sometimes you may only need to move a few variables, and the rest of the variables will remain referenced.

At this time, you can use closure-capture to specify the variables to be captured.

Usage

link closure-capture

cargo.toml

[dependencies]
closure-capture = "0.1"

Move variables a and b into the closure

fn main() {
    let a = 1;
    let b = 2;
     
    std::thread::spawn(closure_capture::closure!([a, b] () {
        println!("{}", a + b)
    }))
    .join()
    .unwrap();
}

Move variables a and b into the closure and modify a

fn main() {
    let a = 1;
    let b = 2;
     
    std::thread::spawn(closure_capture::closure!([mut a, b] () {
        a += b;
        println!("{}", a)
    }))
    .join()
    .unwrap();
}

With async block

#[tokio::main]
async fn main() {
    let a = 1;
    let b = 2;
 
    tokio::spawn(closure_capture::async_block!([mut a, b] async {
        a += b;
        println!("{}", a)
    }))
    .await
    .unwrap();
}

Macros

async_block

closure