# Macro core::ptr::addr_of 1.51.0[−][src]

    pub macro addr_of($place:expr) {
        ...
    }

Create a `const` raw pointer to a place, without creating an intermediate reference.

Creating a reference with `&`/`&mut` is only allowed if the pointer is properly aligned and points to initialized data. For cases where those requirements do not hold, raw pointers should be used instead. However, `&expr as *const _` creates a reference before casting it to a raw pointer, and that reference is subject to the same rules as all other references. This macro can create a raw pointer without creating a reference first.

# Example

    use std::ptr;

    #[repr(packed)]
    struct Packed {
        f1: u8,
        f2: u16,
    }

    let packed = Packed { f1: 1, f2: 2 };
    // `&packed.f2` would create an unaligned reference, and thus be Undefined Behavior!
    let raw_f2 = ptr::addr_of!(packed.f2);
    assert_eq!(unsafe { raw_f2.read_unaligned() }, 2);

Run