50 lines
781 B
Go
50 lines
781 B
Go
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package reactive
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type NotificationKind int
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const (
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NextNotification NotificationKind = iota
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ErrorNotification
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)
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type Notification[T any] interface {
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Value() T
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Error() error
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Kind() NotificationKind
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}
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func MakeNext[T any](v T) Notification[T] {
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return val[T]{v}
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}
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func MakeError[T any](e error) Notification[T] {
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return err[T]{e}
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}
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type val[T any] struct {
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value T
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}
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type err[T any] struct {
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err error
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}
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func (v val[T]) Value() T {
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return v.value
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}
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func (v val[T]) Error() error {
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return nil
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}
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func (v val[T]) Kind() NotificationKind {
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return NextNotification
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}
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func (e err[T]) Value() T {
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panic("tried to .Value() on an Error notification")
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}
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func (e err[T]) Error() error {
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return e.err
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}
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func (e err[T]) Kind() NotificationKind {
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return ErrorNotification
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}
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