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package common
import "reflect"
type Opt[T any] interface {
OrElse(thing T) T
}
type OptError[T any] struct {
thing T
err error
}
type OptNull[T any] struct {
ptr *T
}
type OptZero[T any] struct {
thing T
}
func (o OptNull[T]) OrElse(thing T) T {
if o.ptr != nil {
return *o.ptr
}
return thing
}
func Errorable[T any](thing T, err error) Opt[T] {
return OptError[T]{
thing: thing,
err: err,
}
}
func (o OptError[T]) OrElse(thing T) T {
if o.err != nil {
return thing
}
return o.thing
}
func Nullable[T any](ptr *T) Opt[T] {
return OptNull[T]{
ptr: ptr,
}
}
func Zeroable[T any](thing T) Opt[T] {
return OptZero[T]{
thing: thing,
}
}
func (o OptZero[T]) OrElse(thing T) T {
var zero T
if reflect.DeepEqual(zero, o.thing) {
return thing
}
return o.thing
}
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