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option.go
42 lines (33 loc) · 646 Bytes
/
option.go
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package result
type Option[T any] struct {
value *T
}
func Some[T any](value T) Option[T] {
return Option[T]{value: &value}
}
func None[T any]() Option[T] {
return Option[T]{value: nil}
}
func (opt Option[T]) Some() bool {
return opt.value != nil
}
func (opt Option[T]) Value() T {
return *opt.value
}
func (opt Option[T]) Unwrap() T {
if opt.value == nil {
panic("unwrap on nil value")
}
return *opt.value
}
func (opt Option[T]) None() bool {
return opt.value == nil
}
func (opt Option[T]) BeSome(value T) Option[T] {
opt.value = &value
return opt
}
func (opt Option[T]) BeNone() Option[T] {
opt.value = nil
return opt
}