Optional values with nil pointers

optional_values_with_nil_pointers_test.go

package playground_optional_values_with_nil_pointers

import (
	"fmt"
	"testing"

	"github.com/ChainSafe/gossamer/codec"
)

// Bool represents boolean values
type Bool struct {
	Value *bool
}

// NewBool creates a new Bool
func NewBool(b bool) Bool {
	return Bool{&b}
}

func NewEmptyBool() Bool {
	return Bool{nil}
}

func (b *Bool) IsEmpty() bool {
	return b.Value == nil
}

func (b *Bool) Encode() ([]byte, error) {
	return codec.Encode(b.Value)
}

func (b *Bool) String() string {
	empty, value := b.Get()
	if empty {
		return fmt.Sprintf("nil")
	}
	return fmt.Sprintf("%t", value)
}

func (b *Bool) Get() (empty bool, value bool) {
	if b.Value == nil {
		return true, false
	}
	return false, *b.Value
}

func (b *Bool) Set(i bool) {
	b.Value = &i
}

func (b *Bool) SetEmpty() {
	b.Value = nil
}

func TestNo3(t *testing.T) {
	b := NewBool(true)
	c := NewEmptyBool()

	fmt.Println(b.String())
	fmt.Println(c.String())

	b.SetEmpty()
	c.Set(false)

	fmt.Println(b.String())
	fmt.Println(c.String())
}