objc2 0.5.2

Objective-C interface and runtime bindings
Documentation 
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use objc2::encode::{Encode, Encoding};

#[cfg(target_pointer_width = "32")]
type CGFloat = f32;
#[cfg(target_pointer_width = "64")]
type CGFloat = f64;

#[repr(C)]
struct CGPoint {
    x: CGFloat,
    y: CGFloat,
}

// SAFETY: The struct is `repr(C)`, and the encoding is correct.
unsafe impl Encode for CGPoint {
    const ENCODING: Encoding = Encoding::Struct("CGPoint", &[CGFloat::ENCODING, CGFloat::ENCODING]);
}

#[repr(C)]
struct CGSize {
    width: CGFloat,
    height: CGFloat,
}

// SAFETY: The struct is `repr(C)`, and the encoding is correct.
unsafe impl Encode for CGSize {
    const ENCODING: Encoding = Encoding::Struct("CGSize", &[CGFloat::ENCODING, CGFloat::ENCODING]);
}

#[repr(C)]
struct CGRect {
    origin: CGPoint,
    size: CGSize,
}

// SAFETY: The struct is `repr(C)`, and the encoding is correct.
unsafe impl Encode for CGRect {
    const ENCODING: Encoding = Encoding::Struct("CGRect", &[CGPoint::ENCODING, CGSize::ENCODING]);
}

fn main() {
    let expected = if cfg!(target_pointer_width = "64") {
        "{CGRect={CGPoint=dd}{CGSize=dd}}"
    } else {
        "{CGRect={CGPoint=ff}{CGSize=ff}}"
    };

    assert!(CGRect::ENCODING.equivalent_to_str(expected));
}