bool: Generate with gen-valuewrapper

Generate atomic.Bool with gen-valuewrapper by wrapping atomic.Uint32.
CAS, Swap, and JSON implementations are generated automatically.

bool.go

@@ -1,3 +1,5 @@
+// @generated Code generated by gen-atomicwrapper.
+
 // Copyright (c) 2020 Uber Technologies, Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -22,79 +24,58 @@ package atomic
 
 import (
 	"encoding/json"
-	"strconv"
-	"sync/atomic"
 )
 
-// Bool is an atomic Boolean.
+// Bool is an atomic type-safe wrapper for bool values.
 type Bool struct {
 	nocmp // disallow non-atomic comparison
 
-	v uint32
+	v Uint32
 }
 
-// NewBool creates a Bool.
-func NewBool(initial bool) *Bool {
-	return &Bool{v: boolToInt(initial)}
-}
+var _zeroBool bool
 
-// Load atomically loads the Boolean.
-func (b *Bool) Load() bool {
-	return truthy(atomic.LoadUint32(&b.v))
-}
-
-// CAS is an atomic compare-and-swap.
-func (b *Bool) CAS(old, new bool) bool {
-	return atomic.CompareAndSwapUint32(&b.v, boolToInt(old), boolToInt(new))
-}
-
-// Store atomically stores the passed value.
-func (b *Bool) Store(new bool) {
-	atomic.StoreUint32(&b.v, boolToInt(new))
-}
-
-// Swap sets the given value and returns the previous value.
-func (b *Bool) Swap(new bool) bool {
-	return truthy(atomic.SwapUint32(&b.v, boolToInt(new)))
-}
-
-// Toggle atomically negates the Boolean and returns the previous value.
-func (b *Bool) Toggle() bool {
-	for {
-		old := b.Load()
-		if b.CAS(old, !old) {
-			return old
-		}
+// NewBool creates a new Bool.
+func NewBool(v bool) *Bool {
+	x := &Bool{}
+	if v != _zeroBool {
+		x.Store(v)
 	}
+	return x
 }
 
-func truthy(n uint32) bool {
-	return n == 1
+// Load atomically loads the wrapped bool.
+func (x *Bool) Load() bool {
+	return truthy(x.v.Load())
 }
 
-func boolToInt(b bool) uint32 {
-	if b {
-		return 1
-	}
-	return 0
+// Store atomically stores the passed bool.
+func (x *Bool) Store(v bool) {
+	x.v.Store(boolToInt(v))
+}
+
+// CAS is an atomic compare-and-swap for bool values.
+func (x *Bool) CAS(o, n bool) bool {
+	return x.v.CAS(boolToInt(o), boolToInt(n))
+}
+
+// Swap atomically stores the given bool and returns the old
+// value.
+func (x *Bool) Swap(o bool) bool {
+	return truthy(x.v.Swap(boolToInt(o)))
 }
 
 // MarshalJSON encodes the wrapped bool into JSON.
-func (b *Bool) MarshalJSON() ([]byte, error) {
-	return json.Marshal(b.Load())
+func (x *Bool) MarshalJSON() ([]byte, error) {
+	return json.Marshal(x.Load())
 }
 
-// UnmarshalJSON decodes JSON into the wrapped bool.
-func (b *Bool) UnmarshalJSON(t []byte) error {
+// UnmarshalJSON decodes a bool from JSON.
+func (x *Bool) UnmarshalJSON(b []byte) error {
 	var v bool
-	if err := json.Unmarshal(t, &v); err != nil {
+	if err := json.Unmarshal(b, &v); err != nil {
 		return err
 	}
-	b.Store(v)
+	x.Store(v)
 	return nil
 }
-
-// String encodes the wrapped value as a string.
-func (b *Bool) String() string {
-	return strconv.FormatBool(b.Load())
-}