Golang function pointer as a part of a struct
There's a typo in your code, but wrapping the func into a struct is unnecessary anyway. Instead, you can just define a WriteFunc type that wraps a function, and that you can define a Write method on. Here's a full example.
package main
import (
"fmt"
"io"
"strings"
)
type WriteFunc func(p []byte) (n int, err error)
func (wf WriteFunc) Write(p []byte) (n int, err error) {
return wf(p)
}
func myWrite(p []byte) (n int, err error) {
fmt.Print("%v", p)
return len(p), nil
}
func main() {
io.Copy(WriteFunc(myWrite), strings.NewReader("Hello world"))
}
Fix MyWriterFunction
/MyWriteFunction
typo. For example,
package main
import (
"fmt"
"io"
"os"
)
type FWriter struct {
WriteF func(p []byte) (n int, err error)
}
func (self *FWriter) Write(p []byte) (n int, err error) {
return self.WriteF(p)
}
func MyWriteFunction(p []byte) (n int, err error) {
// this function implements the Writer interface but is not named "Write"
fmt.Print("%v", p)
return len(p), nil
}
func main() {
MyFWriter := new(FWriter)
MyFWriter.WriteF = MyWriteFunction
// I want to use MyWriteFunction with io.Copy
io.Copy(MyFWriter, os.Stdin)
}