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