Macro offset::offset_of

macro_rules! offset_of {
    ($ty:ident::$field:ident) => { ... };
    (<$ty:path>::$field:ident) => { ... };
}

Constructs an offset from a type and a field name.

The syntax is offset_of!(Type::field) where Type is either an ident or a path in angle brackets.

Example

struct Hello {
    message: &'static str,
}

let hello = Hello {
    message: "hello world!",
};

assert!(hello.message == *offset::offset_of!(Hello::message).index_in(&hello));