I believe this is a legitimate use case for Gob serialization. Yet enc.Encode
returns an error because Something
has no exported field. Note that I’m not serializing Something
directly but only Composed
that contains exported fields.
The only workaround I’ve found was to add a Dummy
(exported) value to Something
. This is ugly. Is there a more elegant solution?
https://play.golang.org/p/0pL6BfBb78m
package main
import (
"bytes"
"encoding/gob"
)
type Something struct {
temp int
}
func (*Something) DoSomething() {}
type Composed struct {
Something
DataToSerialize int
}
func main() {
enc := gob.NewEncoder(&bytes.Buffer{})
err := enc.Encode(Composed{})
if err != nil {
panic(err)
}
}
Here are some different workarounds from that proposed in the question.
Don't use embedding.
type Composed struct {
something Something
DataToSerialize int
}
func (c *Composed) DoSomething() { c.something.DoSomething() }
playground example
Implement GobDecoder and GobEncoder
func (*Something) GobDecode([]byte) error { return nil }
func (Something) GobEncode() ([]byte, error) { return nil, nil }
playground example
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