mirror of
https://github.com/golang/go
synced 2024-11-23 13:00:07 -07:00
53 lines
765 B
Go
53 lines
765 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2017 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 main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"encoding/binary"
|
||
|
|
)
|
||
|
|
|
||
|
|
var (
|
||
|
|
ch1 = make(chan int)
|
||
|
|
ch2 = make(chan int)
|
||
|
|
|
||
|
|
bin = []byte("a\000\000\001")
|
||
|
|
want = binary.BigEndian.Uint32(bin)
|
||
|
|
|
||
|
|
c consumer = noopConsumer{}
|
||
|
|
)
|
||
|
|
|
||
|
|
type msg struct {
|
||
|
|
code uint32
|
||
|
|
}
|
||
|
|
|
||
|
|
type consumer interface {
|
||
|
|
consume(msg)
|
||
|
|
}
|
||
|
|
|
||
|
|
type noopConsumer struct{}
|
||
|
|
|
||
|
|
func (noopConsumer) consume(msg) {}
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
close(ch1)
|
||
|
|
}
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
var m msg
|
||
|
|
m.code = binary.BigEndian.Uint32(bin)
|
||
|
|
|
||
|
|
select {
|
||
|
|
case <-ch1:
|
||
|
|
c.consume(m)
|
||
|
|
if m.code != want {
|
||
|
|
// can not use m.code here, or it will work
|
||
|
|
panic("BigEndian read failed")
|
||
|
|
}
|
||
|
|
case <-ch2:
|
||
|
|
}
|
||
|
|
}
|