47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
// Copyright 2015 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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// Checks that functional-record-update order-of-eval is as expected
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// even when no Drop-implementations are involved.
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use std::sync::atomic::{Ordering, AtomicUsize};
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struct W { wrapped: u32 }
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struct S { f0: W, _f1: i32 }
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pub fn main() {
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const VAL: u32 = 0x89AB_CDEF;
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let w = W { wrapped: VAL };
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let s = S {
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f0: { event(0x01); W { wrapped: w.wrapped + 1 } },
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..S {
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f0: { event(0x02); w},
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_f1: 23
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}
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};
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assert_eq!(s.f0.wrapped, VAL + 1);
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let actual = event_log();
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let expect = 0x01_02;
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assert!(expect == actual,
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"expect: 0x{:x} actual: 0x{:x}", expect, actual);
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}
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static LOG: AtomicUsize = AtomicUsize::new(0);
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fn event_log() -> usize {
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LOG.load(Ordering::SeqCst)
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}
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fn event(tag: u8) {
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let old_log = LOG.load(Ordering::SeqCst);
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let new_log = (old_log << 8) + tag as usize;
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LOG.store(new_log, Ordering::SeqCst);
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}
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