On 3/12/14 7:16 AM, Bill Myers wrote:
However, the extensibility of trait objects comes at the cost of fat
pointers, which can be a problem if you have a lot of pointers.
This is fixable without introducing virtual functions, by adding a
way to express "Struct and vtable for impl Trait for Struct" and
"thin pointer to Struct and vtable for impl Trait for Struct" (or by
using an indirect pointer, i.e. ~~Trait or Rc<~Trait>).
I don't understand the first option--isn't that basically "virtual
struct"? The second has overhead even worse than the fat pointer: two
allocations.
Patrick
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