// 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
}
// This example shows the basic usage of the package: Create an encoder,
// transmit some values, receive them with a decoder.
func Example_basic() {
// Initialize the encoder and decoder. Normally enc and dec would be
// bound to network connections and the encoder and decoder would
// run in different processes.
var network bytes.Buffer // Stand-in for a network connection
enc := gob.NewEncoder(&network) // Will write to network.
dec := gob.NewDecoder(&network) // Will read from network.
// Encode (send) some values.
err := enc.Encode(P{3, 4, 5, "Pythagoras"})
if err != nil {
log.Fatal("encode error:", err)
}
err = enc.Encode(P{1782, 1841, 1922, "Treehouse"})
if err != nil {
log.Fatal("encode error:", err)
}
// Decode (receive) and print the values.
var q Q
err = dec.Decode(&q)
if err != nil {
log.Fatal("decode error 1:", err)
}
fmt.Printf("%q: {%d, %d}\n", q.Name, *q.X, *q.Y)
err = dec.Decode(&q)
if err != nil {
log.Fatal("decode error 2:", err)
}
fmt.Printf("%q: {%d, %d}\n", q.Name, *q.X, *q.Y)
// Output:
// "Pythagoras": {3, 4}
// "Treehouse": {1782, 1841}
}
// 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.
// Create an encoder and send a value.
enc := gob.NewEncoder(&network)
err := enc.Encode(Vector{3, 4, 5})
if err != nil {
log.Fatal("encode:", err)
}
// Create a decoder and receive a value.
dec := gob.NewDecoder(&network)
var v Vector
err = dec.Decode(&v)
if err != nil {
log.Fatal("decode:", err)
}
fmt.Println(v)
// Output:
// {3 4 5}
}
