abool/README.md

# ABool :bulb:

[![Go Report Card](https://goreportcard.com/badge/github.com/tevino/abool)](https://goreportcard.com/report/github.com/tevino/abool)
[![GoDoc](https://godoc.org/github.com/tevino/abool?status.svg)](https://godoc.org/github.com/tevino/abool)

Atomic Boolean library for Go, optimized for performance yet simple to use.

Use this for cleaner code.

## Usage

```go
import "github.com/tevino/abool"

cond := abool.New()     // default to false

cond.Set()              // Set to true
cond.IsSet()            // Returns true
cond.UnSet()            // Set to false
cond.SetTo(any)         // Set to whatever you want
cond.SetToIf(new, old)  // Sets to `new` only if the Boolean matches the `old`, returns whether succeeded
cond.Toggle()           // Inverts the boolean then returns the value before inverting


// embedding
type Foo struct {
    cond *abool.AtomicBool  // always use pointer to avoid copy
}
```

## Benchmark

- Go 1.11.5
- OS X 10.14.5

```shell
# Read
BenchmarkMutexRead-4            100000000               14.7 ns/op
BenchmarkAtomicValueRead-4      2000000000               0.45 ns/op
BenchmarkAtomicBoolRead-4       2000000000               0.35 ns/op  # <--- This package

# Write
BenchmarkMutexWrite-4           100000000               14.5 ns/op
BenchmarkAtomicValueWrite-4     100000000               10.5 ns/op
BenchmarkAtomicBoolWrite-4      300000000                5.21 ns/op  # <--- This package

# CAS
BenchmarkMutexCAS-4             50000000                31.3 ns/op
BenchmarkAtomicBoolCAS-4        200000000                7.18 ns/op  # <--- This package

# Toggle
BenchmarkMutexToggle-4          50000000                32.6 ns/op
BenchmarkAtomicBoolToggle-4     300000000                5.21 ns/op  # <--- This package
```

## Special thanks to contributors

- [@barryz](https://github.com/barryz)
  - Added the `Toggle` method