opencv 0.23.0

Rust bindings for OpenCV
Documentation 
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use std::mem::transmute;

use opencv::{
    core::{DataType, Mat, Scalar},
    Result,
};

#[test]
fn layout() -> Result<()> {
    let mat = Mat::new_rows_cols_with_default(1, 3, f32::typ(), Scalar::all(10.))?;
    let mat_ref: &mut Mat = unsafe { transmute(&mut mat.as_raw_Mat()) };
    assert_eq!(mat.size()?, mat_ref.size()?);
    assert_eq!(mat.typ()?, mat_ref.typ()?);
    assert_eq!(mat.rows()?, mat_ref.rows()?);
    assert_eq!(mat.cols()?, mat_ref.cols()?);
    assert_eq!(mat.at_2d::<f32>(0, 1)?, mat_ref.at_2d::<f32>(0, 1)?);
    Ok(())
}