45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
use std::mem;
|
|
|
|
const FOO: fn(u8) -> u8 = |v: u8| { v };
|
|
|
|
const BAR: [fn(&mut u32); 5] = [
|
|
|_: &mut u32| {},
|
|
|v: &mut u32| *v += 1,
|
|
|v: &mut u32| *v += 2,
|
|
|v: &mut u32| *v += 3,
|
|
|v: &mut u32| *v += 4,
|
|
];
|
|
fn func_specific() -> (fn() -> u32) {
|
|
|| return 42
|
|
}
|
|
|
|
fn generic<T>(_: T) -> fn() -> usize {
|
|
|| mem::size_of::<T>()
|
|
}
|
|
|
|
fn main() {
|
|
// Items
|
|
assert_eq!(func_specific()(), 42);
|
|
let foo: fn(u8) -> u8 = |v: u8| { v };
|
|
assert_eq!(foo(31), 31);
|
|
// Constants
|
|
assert_eq!(FOO(31), 31);
|
|
let mut a: u32 = 0;
|
|
assert_eq!({ BAR[0](&mut a); a }, 0);
|
|
assert_eq!({ BAR[1](&mut a); a }, 1);
|
|
assert_eq!({ BAR[2](&mut a); a }, 3);
|
|
assert_eq!({ BAR[3](&mut a); a }, 6);
|
|
assert_eq!({ BAR[4](&mut a); a }, 10);
|
|
assert_eq!(generic(0i8)(), 1);
|
|
}
|