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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package containers
import (
"encoding/json"
)
type Optional[T any] struct {
OK bool
Val T
}
func OptionalValue[T any](val T) Optional[T] {
return Optional[T]{
OK: true,
Val: val,
}
}
func OptionalNil[T any]() Optional[T] {
return Optional[T]{
OK: false,
}
}
var (
_ json.Marshaler = Optional[bool]{}
_ json.Unmarshaler = (*Optional[bool])(nil)
)
func (o Optional[T]) MarshalJSON() ([]byte, error) {
if !o.OK {
return []byte("null"), nil
}
return json.Marshal(o.Val)
}
func (o *Optional[T]) UnmarshalJSON(dat []byte) error {
if string(dat) == "null" {
*o = Optional[T]{}
return nil
}
o.OK = true
return json.Unmarshal(dat, &o.Val)
}
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