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struct FuncContainer {
f1: fn(data: u8),
f2: extern "C" fn(data: u8),
f3: unsafe fn(data: u8),
}
struct FuncContainerOuter {
container: Box<FuncContainer>
}
struct Obj<F> where F: FnOnce() -> u32 {
closure: F,
not_closure: usize,
}
struct BoxedObj {
boxed_closure: Box<dyn FnOnce() -> u32>,
}
struct Wrapper<F> where F: FnMut() -> u32 {
wrap: Obj<F>,
}
fn func() -> u32 {
0
}
fn check_expression() -> Obj<Box<dyn FnOnce() -> u32>> {
Obj { closure: Box::new(|| 42_u32) as Box<dyn FnOnce() -> u32>, not_closure: 42 }
}
fn main() {
// test variations of function
let o_closure = Obj { closure: || 42, not_closure: 42 };
o_closure.closure(); //~ ERROR no method named `closure` found
o_closure.not_closure();
//~^ ERROR no method named `not_closure` found
let o_func = Obj { closure: func, not_closure: 5 };
o_func.closure(); //~ ERROR no method named `closure` found
let boxed_fn = BoxedObj { boxed_closure: Box::new(func) };
boxed_fn.boxed_closure();//~ ERROR no method named `boxed_closure` found
let boxed_closure = BoxedObj { boxed_closure: Box::new(|| 42_u32) as Box<dyn FnOnce() -> u32> };
boxed_closure.boxed_closure();//~ ERROR no method named `boxed_closure` found
// test expression writing in the notes
let w = Wrapper { wrap: o_func };
w.wrap.closure();//~ ERROR no method named `closure` found
w.wrap.not_closure();
//~^ ERROR no method named `not_closure` found
check_expression().closure();//~ ERROR no method named `closure` found
}
impl FuncContainerOuter {
fn run(&self) {
unsafe {
(*self.container).f1(1); //~ ERROR no method named `f1` found
(*self.container).f2(1); //~ ERROR no method named `f2` found
(*self.container).f3(1); //~ ERROR no method named `f3` found
}
}
}
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