1 // Copyright (c) 2020 Uber Technologies, Inc.
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining a copy
4 // of this software and associated documentation files (the "Software"), to deal
5 // in the Software without restriction, including without limitation the rights
6 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 // copies of the Software, and to permit persons to whom the Software is
8 // furnished to do so, subject to the following conditions:
9 //
10 // The above copyright notice and this permission notice shall be included in
11 // all copies or substantial portions of the Software.
12 //
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 // THE SOFTWARE.
20 21 package atomic
22 23 import (
24 "strconv"
25 )
26 27 //go:generate bin/gen-atomicwrapper -name=Bool -type=bool -wrapped=Uint32 -pack=boolToInt -unpack=truthy -cas -swap -json -file=bool.go
28 29 func truthy(n uint32) bool {
30 return n == 1
31 }
32 33 func boolToInt(b bool) uint32 {
34 if b {
35 return 1
36 }
37 return 0
38 }
39 40 // Toggle atomically negates the Boolean and returns the previous value.
41 func (b *Bool) Toggle() (old bool) {
42 for {
43 old := b.Load()
44 if b.CAS(old, !old) {
45 return old
46 }
47 }
48 }
49 50 // String encodes the wrapped value as a string.
51 func (b *Bool) String() string {
52 return strconv.FormatBool(b.Load())
53 }
54