如何告诉Golang Gob编码可以序列化包含没有导出字段的结构的结构
问题描述：
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)
}
}
答
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() }
Implement GobDecoder and GobEncoder
func (*Something) GobDecode([]byte) error { return nil }
func (Something) GobEncode() ([]byte, error) { return nil, nil }