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//! Check that the `Drop` implementation is called when a value goes out of scope.
//@ run-pass
#![allow(non_camel_case_types)]
use std::cell::Cell;
struct shrinky_pointer<'a> {
i: &'a Cell<isize>,
}
impl<'a> Drop for shrinky_pointer<'a> {
fn drop(&mut self) {
println!("Hello!");
self.i.set(self.i.get() - 1);
}
}
impl<'a> shrinky_pointer<'a> {
pub fn look_at(&self) -> isize {
return self.i.get();
}
}
fn shrinky_pointer(i: &Cell<isize>) -> shrinky_pointer<'_> {
shrinky_pointer { i }
}
pub fn main() {
let my_total = &Cell::new(10);
{
let pt = shrinky_pointer(my_total);
assert_eq!(pt.look_at(), 10);
}
println!("my_total = {}", my_total.get());
assert_eq!(my_total.get(), 9);
}
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