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#[macro_use]
extern crate rental;
pub struct Foo {
i: i32,
}
impl Foo {
fn try_borrow_mut(&mut self) -> Result<&mut i32, ()> { Ok(&mut self.i) }
fn fail_borrow_mut(&mut self) -> Result<&mut i32, ()> { Err(()) }
}
rental! {
mod rentals {
use super::*;
#[rental_mut]
pub struct SimpleMut {
foo: Box<Foo>,
iref: &'foo mut i32,
}
}
}
#[test]
fn new() {
let foo = Foo { i: 5 };
let _ = rentals::SimpleMut::new(Box::new(foo), |foo| &mut foo.i);
let foo = Foo { i: 5 };
let sm = rentals::SimpleMut::try_new(Box::new(foo), |foo| foo.try_borrow_mut());
assert!(sm.is_ok());
let foo = Foo { i: 5 };
let sm = rentals::SimpleMut::try_new(Box::new(foo), |foo| foo.fail_borrow_mut());
assert!(sm.is_err());
}
#[test]
fn read() {
let foo = Foo { i: 5 };
let sm = rentals::SimpleMut::new(Box::new(foo), |foo| &mut foo.i);
let i: i32 = sm.rent(|iref| **iref);
assert_eq!(i, 5);
let iref: &i32 = sm.ref_rent(|iref| *iref);
assert_eq!(*iref, 5);
}
#[test]
fn write() {
let foo = Foo { i: 5 };
let mut sm = rentals::SimpleMut::new(Box::new(foo), |foo| &mut foo.i);
{
let iref: &mut i32 = sm.ref_rent_mut(|iref| *iref);
*iref = 12;
assert_eq!(*iref, 12);
}
}
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