bool_ext.go

// Copyright (c) 2020 Uber Technologies, Inc.
//
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// of this software and associated documentation files (the "Software"), to deal
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// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// THE SOFTWARE.

package atomic

import (
	"strconv"
)

//go:generate bin/gen-atomicwrapper -name=Bool -type=bool -wrapped=Uint32 -pack=boolToInt -unpack=truthy -cas -swap -json -file=bool.go

func truthy(n uint32) bool {
	return n == 1
}

func boolToInt(b bool) uint32 {
	if b {
		return 1
	}
	return 0
}

// Toggle atomically negates the Boolean and returns the previous value.
func (b *Bool) Toggle() (old bool) {
	for {
		old := b.Load()
		if b.CAS(old, !old) {
			return old
		}
	}
}

// String encodes the wrapped value as a string.
func (b *Bool) String() string {
	return strconv.FormatBool(b.Load())
}