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|
//@ run-pass
#![feature(trait_upcasting)]
use std::rc::Rc;
use std::sync::Arc;
trait Foo: PartialEq<i32> + std::fmt::Debug + Send + Sync {
fn a(&self) -> i32 {
10
}
fn z(&self) -> i32 {
11
}
fn y(&self) -> i32 {
12
}
}
trait Bar: Foo {
fn b(&self) -> i32 {
20
}
fn w(&self) -> i32 {
21
}
}
trait Baz: Bar {
fn c(&self) -> i32 {
30
}
}
impl Foo for i32 {
fn a(&self) -> i32 {
100
}
}
impl Bar for i32 {
fn b(&self) -> i32 {
200
}
}
impl Baz for i32 {
fn c(&self) -> i32 {
300
}
}
fn test_box() {
let v = Box::new(1);
let baz: Box<dyn Baz> = v.clone();
assert_eq!(*baz, 1);
assert_eq!(baz.a(), 100);
assert_eq!(baz.b(), 200);
assert_eq!(baz.c(), 300);
assert_eq!(baz.z(), 11);
assert_eq!(baz.y(), 12);
assert_eq!(baz.w(), 21);
let baz: Box<dyn Baz> = v.clone();
let bar: Box<dyn Bar> = baz;
assert_eq!(*bar, 1);
assert_eq!(bar.a(), 100);
assert_eq!(bar.b(), 200);
assert_eq!(bar.z(), 11);
assert_eq!(bar.y(), 12);
assert_eq!(bar.w(), 21);
let baz: Box<dyn Baz> = v.clone();
let foo: Box<dyn Foo> = baz;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
assert_eq!(foo.z(), 11);
assert_eq!(foo.y(), 12);
let baz: Box<dyn Baz> = v.clone();
let bar: Box<dyn Bar> = baz;
let foo: Box<dyn Foo> = bar;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
assert_eq!(foo.z(), 11);
assert_eq!(foo.y(), 12);
}
fn test_rc() {
let v = Rc::new(1);
let baz: Rc<dyn Baz> = v.clone();
assert_eq!(*baz, 1);
assert_eq!(baz.a(), 100);
assert_eq!(baz.b(), 200);
assert_eq!(baz.c(), 300);
assert_eq!(baz.z(), 11);
assert_eq!(baz.y(), 12);
assert_eq!(baz.w(), 21);
let baz: Rc<dyn Baz> = v.clone();
let bar: Rc<dyn Bar> = baz;
assert_eq!(*bar, 1);
assert_eq!(bar.a(), 100);
assert_eq!(bar.b(), 200);
assert_eq!(bar.z(), 11);
assert_eq!(bar.y(), 12);
assert_eq!(bar.w(), 21);
let baz: Rc<dyn Baz> = v.clone();
let foo: Rc<dyn Foo> = baz;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
assert_eq!(foo.z(), 11);
assert_eq!(foo.y(), 12);
let baz: Rc<dyn Baz> = v.clone();
let bar: Rc<dyn Bar> = baz;
let foo: Rc<dyn Foo> = bar;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
assert_eq!(foo.z(), 11);
assert_eq!(foo.y(), 12);
assert_eq!(foo.z(), 11);
assert_eq!(foo.y(), 12);
}
fn test_arc() {
let v = Arc::new(1);
let baz: Arc<dyn Baz> = v.clone();
assert_eq!(*baz, 1);
assert_eq!(baz.a(), 100);
assert_eq!(baz.b(), 200);
assert_eq!(baz.c(), 300);
assert_eq!(baz.z(), 11);
assert_eq!(baz.y(), 12);
assert_eq!(baz.w(), 21);
let baz: Arc<dyn Baz> = v.clone();
let bar: Arc<dyn Bar> = baz;
assert_eq!(*bar, 1);
assert_eq!(bar.a(), 100);
assert_eq!(bar.b(), 200);
assert_eq!(bar.z(), 11);
assert_eq!(bar.y(), 12);
assert_eq!(bar.w(), 21);
let baz: Arc<dyn Baz> = v.clone();
let foo: Arc<dyn Foo> = baz;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
assert_eq!(foo.z(), 11);
assert_eq!(foo.y(), 12);
let baz: Arc<dyn Baz> = v.clone();
let bar: Arc<dyn Bar> = baz;
let foo: Arc<dyn Foo> = bar;
assert_eq!(*foo, 1);
assert_eq!(foo.a(), 100);
assert_eq!(foo.z(), 11);
assert_eq!(foo.y(), 12);
}
fn main() {
test_box();
test_rc();
test_arc();
}
|
