79 lines
1.3 KiB
Rust
79 lines
1.3 KiB
Rust
// run-pass
|
|
|
|
#![feature(lang_items, unboxed_closures, fn_traits)]
|
|
|
|
use std::ops::{Fn, FnMut, FnOnce};
|
|
|
|
struct S1 {
|
|
x: i32,
|
|
y: i32,
|
|
}
|
|
|
|
impl FnMut<(i32,)> for S1 {
|
|
extern "rust-call" fn call_mut(&mut self, (z,): (i32,)) -> i32 {
|
|
self.x * self.y * z
|
|
}
|
|
}
|
|
|
|
impl FnOnce<(i32,)> for S1 {
|
|
type Output = i32;
|
|
extern "rust-call" fn call_once(mut self, args: (i32,)) -> i32 {
|
|
self.call_mut(args)
|
|
}
|
|
}
|
|
|
|
struct S2 {
|
|
x: i32,
|
|
y: i32,
|
|
}
|
|
|
|
impl Fn<(i32,)> for S2 {
|
|
extern "rust-call" fn call(&self, (z,): (i32,)) -> i32 {
|
|
self.x * self.y * z
|
|
}
|
|
}
|
|
|
|
impl FnMut<(i32,)> for S2 {
|
|
extern "rust-call" fn call_mut(&mut self, args: (i32,)) -> i32 { self.call(args) }
|
|
}
|
|
|
|
impl FnOnce<(i32,)> for S2 {
|
|
type Output = i32;
|
|
extern "rust-call" fn call_once(self, args: (i32,)) -> i32 { self.call(args) }
|
|
}
|
|
|
|
struct S3 {
|
|
x: i32,
|
|
y: i32,
|
|
}
|
|
|
|
impl FnOnce<(i32,i32)> for S3 {
|
|
type Output = i32;
|
|
extern "rust-call" fn call_once(self, (z,zz): (i32,i32)) -> i32 {
|
|
self.x * self.y * z * zz
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let mut s = S1 {
|
|
x: 3,
|
|
y: 3,
|
|
};
|
|
let ans = s(3);
|
|
|
|
assert_eq!(ans, 27);
|
|
let s = S2 {
|
|
x: 3,
|
|
y: 3,
|
|
};
|
|
let ans = s.call((3,));
|
|
assert_eq!(ans, 27);
|
|
|
|
let s = S3 {
|
|
x: 3,
|
|
y: 3,
|
|
};
|
|
let ans = s(3, 1);
|
|
assert_eq!(ans, 27);
|
|
}
|