102 lines
3.0 KiB
Rust
102 lines
3.0 KiB
Rust
// Copyright 2012-2013 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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// Issue 4691: Ensure that functional-struct-updates operates
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// correctly and moves rather than copy when appropriate.
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use std::kinds::marker::NoCopy as NP;
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struct ncint { np: NP, v: int }
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fn ncint(v: int) -> ncint { ncint { np: NP, v: v } }
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struct NoFoo { copied: int, nocopy: ncint, }
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impl NoFoo {
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fn new(x:int,y:int) -> NoFoo { NoFoo { copied: x, nocopy: ncint(y) } }
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}
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struct MoveFoo { copied: int, moved: Box<int>, }
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impl MoveFoo {
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fn new(x:int,y:int) -> MoveFoo { MoveFoo { copied: x, moved: box y } }
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}
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struct DropNoFoo { inner: NoFoo }
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impl DropNoFoo {
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fn new(x:int,y:int) -> DropNoFoo { DropNoFoo { inner: NoFoo::new(x,y) } }
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}
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impl Drop for DropNoFoo { fn drop(&mut self) { } }
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struct DropMoveFoo { inner: MoveFoo }
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impl DropMoveFoo {
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fn new(x:int,y:int) -> DropMoveFoo { DropMoveFoo { inner: MoveFoo::new(x,y) } }
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}
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impl Drop for DropMoveFoo { fn drop(&mut self) { } }
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fn test0() {
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// just copy implicitly copyable fields from `f`, no moves
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// (and thus it is okay that these are Drop; compare against
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// compile-fail test: borrowck-struct-update-with-dtor.rs).
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// Case 1: Nocopyable
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let f = DropNoFoo::new(1, 2);
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let b = DropNoFoo { inner: NoFoo { nocopy: ncint(3), ..f.inner }};
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let c = DropNoFoo { inner: NoFoo { nocopy: ncint(4), ..f.inner }};
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assert_eq!(f.inner.copied, 1);
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assert_eq!(f.inner.nocopy.v, 2);
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assert_eq!(b.inner.copied, 1);
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assert_eq!(b.inner.nocopy.v, 3);
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assert_eq!(c.inner.copied, 1);
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assert_eq!(c.inner.nocopy.v, 4);
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// Case 2: Owned
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let f = DropMoveFoo::new(5, 6);
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let b = DropMoveFoo { inner: MoveFoo { moved: box 7, ..f.inner }};
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let c = DropMoveFoo { inner: MoveFoo { moved: box 8, ..f.inner }};
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assert_eq!(f.inner.copied, 5);
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assert_eq!(*f.inner.moved, 6);
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assert_eq!(b.inner.copied, 5);
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assert_eq!(*b.inner.moved, 7);
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assert_eq!(c.inner.copied, 5);
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assert_eq!(*c.inner.moved, 8);
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}
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fn test1() {
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// copying move-by-default fields from `f`, so it moves:
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let f = MoveFoo::new(11, 12);
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let b = MoveFoo {moved: box 13, ..f};
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let c = MoveFoo {copied: 14, ..f};
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assert_eq!(b.copied, 11);
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assert_eq!(*b.moved, 13);
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assert_eq!(c.copied, 14);
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assert_eq!(*c.moved, 12);
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}
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fn test2() {
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// move non-copyable field
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let f = NoFoo::new(21, 22);
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let b = NoFoo {nocopy: ncint(23), ..f};
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let c = NoFoo {copied: 24, ..f};
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assert_eq!(b.copied, 21);
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assert_eq!(b.nocopy.v, 23);
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assert_eq!(c.copied, 24);
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assert_eq!(c.nocopy.v, 22);
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}
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pub fn main() {
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test0();
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test1();
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test2();
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}
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