Function CGLCopyContext 

pub unsafe extern "C-unwind" fn CGLCopyContext(
    src: CGLContextObj,
    dst: CGLContextObj,
    mask: u32,
) -> CGLError

👎Deprecated: The OpenGL API is deprecated by Apple

Available on crate feature CGLTypes only.

Safety

• src must be a valid pointer.
• dst must be a valid pointer.