field-offset: safe pointer-to-member functionality
This crate implements an offset_of!(...)
macro which safely encapsulates
a pointer-to-member.
Example:
let foo_y = offset_of!;
let mut a = Foo ;
*foo_y.apply_mut = 3.0;
assert!;
The macro returns an instance of FieldOffset<T, U>
, which represents a
pointer to a field of type U
within a containing type, T
.
The FieldOffset
type implements Add
. Applying the resulting field offset
is equivalent to applying the first field offset, then applying the second
field offset.
The macro also supports accessing nested fields:
let bar_foo_y = offset_of!;