Rust Essentials - Second Edition

Sending struct values over a channel

The following example shows how to use channels to send struct values:

// see code from Chapter 9/code/channel_struct.rs 
use std::thread; 
use std::sync::mpsc::channel; 
 
struct Block { 
    value: i32 
} 
 
fn main() { 
    let (tx1, rx1) = channel::<Block>(); 
    let (tx2, rx2) = channel::<Block>(); 
     
    thread::spawn(move|| { 
        let mut block = rx1.recv().unwrap(); 
        println!("Input: {:?}", block.value); 
         
        block.value += 1; 
        tx2.send(block).unwrap(); 
    }); 
     
    let input = Block{ value: 1 }; 
    tx1.send(input).unwrap(); 
     
    let output = rx2.recv().unwrap(); 
    println!("Output: {:?}", output.value); 
} 

This produces the following output:

    Input: 1
    Output: 2