mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-06 05:33:59 +00:00
43 lines
818 B
Rust
43 lines
818 B
Rust
use std::ops::Deref;
|
|
use std::ops::DerefMut;
|
|
struct Bar(u8);
|
|
struct Foo(Bar);
|
|
struct Emm(Foo);
|
|
impl Deref for Bar{
|
|
type Target = u8;
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.0
|
|
}
|
|
}
|
|
impl Deref for Foo {
|
|
type Target = Bar;
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.0
|
|
}
|
|
}
|
|
impl Deref for Emm {
|
|
type Target = Foo;
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.0
|
|
}
|
|
}
|
|
impl DerefMut for Bar{
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
&mut self.0
|
|
}
|
|
}
|
|
impl DerefMut for Foo {
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
&mut self.0
|
|
}
|
|
}
|
|
impl DerefMut for Emm {
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
&mut self.0
|
|
}
|
|
}
|
|
fn main() {
|
|
let a = Emm(Foo(Bar(0)));
|
|
let _: *mut u8 = &a; //~ ERROR mismatched types
|
|
}
|