Ownership tricks

test.rs

struct Resource(int);

struct Owner
{
	target: ~Resource
}

impl Owner
{
	fn set_target(&mut self, new_target: ~Resource)
	{
		self.target = new_target;
	}
	
	fn clear_target(&mut self) -> ~Resource
	{
		let mut other = ~Resource(0); // Can I avoid this allocation
		std::util::swap(other, self.target);
		other
	}
}

fn main()
{
	let mut owner = Owner{target: ~Resource(0)};
	let res = ~Resource(1);
	owner.set_target(res);
	let res = owner.clear_target();
	printfln!(res);
}