File: moveonly_computed_property_in_class.swift

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (32 lines) | stat: -rw-r--r-- 833 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
// RUN: %target-run-simple-swift(-Xfrontend -sil-verify-all)
// RUN: %target-run-simple-swift(-O -Xfrontend -sil-verify-all)

// REQUIRES: executable_test
@_moveOnly
struct FileDescriptor {
  let desc: Int

  var empty: Bool { return desc == Int.min }
  func isEmpty() -> Bool { return empty }
}

final class Wrapper {
  var val: FileDescriptor = FileDescriptor(desc: 0)

  func isEmpty_bug() -> Bool {
    // error: 'self.val' has consuming use that cannot 
    // be eliminated due to a tight exclusivity scope
    return val.empty // note: consuming use here
  }

  func isEmpty_ok() -> Bool {
    return val.isEmpty()
  }
}

let w = Wrapper()
// CHECK: is not empty
print(w.isEmpty_bug() ? "is empty" : "is not empty")
w.val = FileDescriptor(desc: Int.min)
// CHECK: is empty
print(w.isEmpty_bug() ? "is empty" : "is not empty")