On 11/14/2013 09:25 PM, Tommi wrote:
trait Inflate {
fn get_radius<'s>(&'s mut self) -> &'s mut int;
fn inflate_by(&mut self, amount: int) {
*self.get_radius() += amount;
}
}
[...]
Third time's the charm. One more detail was still missing:
struct Inflate {
virtual void inflate_by(int amount) = 0;
};
[...]
Thing is, if all you have is an Inflate*, you're going to have to make a
virtual function call to access that member. The goal is to have member
access that works across several similar concrete types, without the
speed cost of accessing a vtable.
(You could do it with a struct containing shared information plus a
discriminated union (Rust enum) of all types that would have implemented
the trait, but I imagine that has other downsides.)
-Isaac
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