Another way to do `Option` without pointers could be similar to the following with a struct with two members.
type Option[T any] struct {
v T
isSet bool
}
func NewOption[T any](v T) Option[T] {
return Option[T]{
v: v,
isSet: true,
}
}
func (o Option[T]) Get() (v T) {
if !o.isSet {
return v
}
return o.v
}
func (o Option[T]) IsSet() bool { return o.isSet }
With this pattern you're able to use `Option` as a value without pointers.
var o Option[int32]
o = NewOption(int32(1))
fmt.Println("value:", o.Get())
fmt.Println("is set:", o.IsSet())
Alternative separate `Get` and `IsSet` methods, is to combine them into one, similar to map look up pattern.
func (o Option[T]) Get() (v T, isSet bool) {
if !o.isSet {
return v, false
}
return o.v, true
}
var o Options[int32]
v, ok := o.Get() // zero, false
o = NewOption(int32(1))
v, ok = o.Get() // 1, true
