}

// Confirm waits for a user to confirm with the supplied message.
func Confirm(msg string, writer io.Writer) bool {
	for {
		_, _ = fmt.Fprintf(writer, "%s ", msg)
		var response string
		_, err := fmt.Scanln(&response)
		if err != nil {
			return false
		}
		switch strings.ToUpper(response) {
		case "Y", "YES":
			return true
		case "N", "NO":
			return false
		}
	}

}

// UnmarshalBinary modifies the receiver so it must take a pointer receiver.
func (v *Vector) UnmarshalBinary(data []byte) error {
	// A simple encoding: plain text.
	b := bytes.NewBuffer(data)
	_, err := fmt.Fscanln(b, &v.x, &v.y, &v.z)
	return err
}

// This example transmits a value that implements the custom encoding and decoding methods.
func Example_encodeDecode() {
	var network bytes.Buffer // Stand-in for the network.

}

// Confirm waits for a user to confirm with the supplied message.
func Confirm(msg string, writer io.Writer) bool {
	for {
		_, _ = fmt.Fprintf(writer, "%s ", msg)
		var response string
		_, err := fmt.Scanln(&response)
		if err != nil {
			return false
		}
		switch strings.ToUpper(response) {
		case "Y", "YES":
			return true
		case "N", "NO":
			return false
		}
	}
}

	// regular messages.
	in := "foo"
	if _, err := fmt.Fprintln(clSPDYStream, in); err != nil {
		t.Fatalf("client: error writing data to stream: %v", err)
	}
	var out string
	if _, err := fmt.Fscanln(clSPDYStream, &out); err != nil {
		t.Fatalf("client: error reading data from stream: %v", err)
	}
	if in != out {
		t.Errorf("client: received data doesn't match sent data: got %q, want %q", out, in)
	}