mirror of https://github.com/rust-lang/rust
63 lines
1.3 KiB
Rust
63 lines
1.3 KiB
Rust
//@ check-pass
|
|
use std::sync::Mutex;
|
|
use std::cell::RefCell;
|
|
use std::rc::Rc;
|
|
use std::ops::*;
|
|
|
|
//eefriedman example
|
|
struct S<'a, T:FnMut() + 'static + ?Sized>(&'a mut T);
|
|
impl<'a, T:?Sized + FnMut() + 'static> DerefMut for S<'a, T> {
|
|
fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0 }
|
|
}
|
|
impl<'a, T:?Sized + FnMut() + 'static> Deref for S<'a, T> {
|
|
type Target = dyn FnMut() + 'a;
|
|
fn deref(&self) -> &Self::Target { &self.0 }
|
|
}
|
|
|
|
//Ossipal example
|
|
struct FunctionIcon {
|
|
get_icon: Mutex<Box<dyn FnMut() -> u32>>,
|
|
}
|
|
|
|
impl FunctionIcon {
|
|
fn get_icon(&self) -> impl '_ + std::ops::DerefMut<Target=Box<dyn FnMut() -> u32>> {
|
|
self.get_icon.lock().unwrap()
|
|
}
|
|
|
|
fn load_icon(&self) {
|
|
let mut get_icon = self.get_icon();
|
|
let _rgba_icon = (*get_icon)();
|
|
}
|
|
}
|
|
|
|
//shepmaster example
|
|
struct Foo;
|
|
|
|
impl Deref for Foo {
|
|
type Target = dyn FnMut() + 'static;
|
|
fn deref(&self) -> &Self::Target {
|
|
unimplemented!()
|
|
}
|
|
}
|
|
|
|
impl DerefMut for Foo {
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
unimplemented!()
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
//eefriedman example
|
|
let mut f = ||{};
|
|
let mut s = S(&mut f);
|
|
s();
|
|
|
|
//Diggsey/Mark-Simulacrum example
|
|
let a: Rc<RefCell<dyn FnMut()>> = Rc::new(RefCell::new(||{}));
|
|
a.borrow_mut()();
|
|
|
|
//shepmaster example
|
|
let mut t = Foo;
|
|
t();
|
|
}
|