57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(fn_traits)]
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#![feature(never_type)]
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use std::panic;
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fn foo(x: u32, y: u32) -> u32 { x/y }
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fn foo_diverges() -> ! { panic!() }
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fn test_fn_ptr<T>(mut t: T)
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where T: Fn(u32, u32) -> u32,
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{
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let as_fn = <T as Fn<(u32, u32)>>::call;
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assert_eq!(as_fn(&t, (9, 3)), 3);
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let as_fn_mut = <T as FnMut<(u32, u32)>>::call_mut;
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assert_eq!(as_fn_mut(&mut t, (18, 3)), 6);
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let as_fn_once = <T as FnOnce<(u32, u32)>>::call_once;
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assert_eq!(as_fn_once(t, (24, 3)), 8);
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}
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fn assert_panics<F>(f: F) where F: FnOnce() {
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let f = panic::AssertUnwindSafe(f);
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let result = panic::catch_unwind(move || {
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f.0()
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});
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if let Ok(..) = result {
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panic!("diverging function returned");
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}
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}
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fn test_fn_ptr_panic<T>(mut t: T)
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where T: Fn() -> !
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{
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let as_fn = <T as Fn<()>>::call;
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assert_panics(|| as_fn(&t, ()));
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let as_fn_mut = <T as FnMut<()>>::call_mut;
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assert_panics(|| as_fn_mut(&mut t, ()));
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let as_fn_once = <T as FnOnce<()>>::call_once;
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assert_panics(|| as_fn_once(t, ()));
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}
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fn main() {
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test_fn_ptr(foo);
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test_fn_ptr(foo as fn(u32, u32) -> u32);
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test_fn_ptr_panic(foo_diverges);
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test_fn_ptr_panic(foo_diverges as fn() -> !);
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}
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