opencv 0.23.0

Rust bindings for OpenCV
Documentation 
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use std::sync::{Arc, Mutex};

use opencv::{highgui, Result};

#[test]
fn callback() -> Result<()> {
    // only run under X11 if on linux
    if cfg!(target_os = "linux") && option_env!("DISPLAY").is_none() {
        return Ok(());
    }
    highgui::named_window("test", 0)?;
    let mut value = 50;
    let cb_value = Arc::new(Mutex::new(0));
    highgui::create_trackbar("test_track", "test", &mut value, 100, Some(Box::new({
        let cb_value = cb_value.clone();
        move |s| {
            *cb_value.lock().unwrap() = s;
        }
    })))?;
    highgui::set_trackbar_pos("test_track", "test", 10)?;
    assert_eq!(value, 10);
    assert_eq!(*cb_value.lock().unwrap(), 10);
    Ok(())
}