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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gob_test
import (
"bytes"
"encoding/gob"
"fmt"
"log"
"math"
)
type Point struct {
X, Y int
}
func (p Point) Hypotenuse() float64 {
return math.Hypot(float64(p.X), float64(p.Y))
}
type Pythagoras interface {
Hypotenuse() float64
}
// This example shows how to encode an interface value. The key
// distinction from regular types is to register the concrete type that
// implements the interface.
func Example_interface() {
var network bytes.Buffer // Stand-in for the network.
// We must register the concrete type for the encoder and decoder (which would
// normally be on a separate machine from the encoder). On each end, this tells the
// engine which concrete type is being sent that implements the interface.
gob.Register(Point{})
// Create an encoder and send some values.
enc := gob.NewEncoder(&network)
for i := 1; i <= 3; i++ {
interfaceEncode(enc, Point{3 * i, 4 * i})
}
// Create a decoder and receive some values.
dec := gob.NewDecoder(&network)
for i := 1; i <= 3; i++ {
result := interfaceDecode(dec)
fmt.Println(result.Hypotenuse())
}
// Output:
// 5
// 10
// 15
}
// interfaceEncode encodes the interface value into the encoder.
func interfaceEncode(enc *gob.Encoder, p Pythagoras) {
// The encode will fail unless the concrete type has been
// registered. We registered it in the calling function.
// Pass pointer to interface so Encode sees (and hence sends) a value of
// interface type. If we passed p directly it would see the concrete type instead.
// See the blog post, "The Laws of Reflection" for background.
err := enc.Encode(&p)
if err != nil {
log.Fatal("encode:", err)
}
}
// interfaceDecode decodes the next interface value from the stream and returns it.
func interfaceDecode(dec *gob.Decoder) Pythagoras {
// The decode will fail unless the concrete type on the wire has been
// registered. We registered it in the calling function.
var p Pythagoras
err := dec.Decode(&p)
if err != nil {
log.Fatal("decode:", err)
}
return p
}