children map[canceler]struct{}// set to nil by the first cancel callerr error// set to non-nil by the first cancel call}func(c*cancelCtx)Done()<-chan struct{}{returnc.done}func(c*cancelCtx)Err()error{c.mu.Lock()
1funcListenAndServe(network,address string){2tcpAddr,err:=net.ResolveTCPAddr(network,address)3iferr!=nil{4logger.Fatalf(nil,"ResolveTcpAddr err:%v",err)5}6listener,err=net.ListenTCP(network,tcpAddr)7iferr!=nil{8logger.Fatalf(nil,"ListenTCP err:%v",err)9}10goaccept()11}1213funcaccep...
This is a small text file. fields_fun.go package main import ( "fmt" "io/ioutil" "log" "strings" ) func main() { fileName := "thermopylae.txt" bs, err := ioutil.ReadFile(fileName) if err != nil { log.Fatal(err) } text := string(bs) fields := strings.Fields(text) for...
func testnil5(a interface{}) bool { v := reflect.ValueOf(a) return !v.IsValid() || v.IsNil() } func main() { var a *State fmt.Println(testnil1(a, nil)) fmt.Println(testnil2(a, nil)) fmt.Println(testnil3(a)) fmt.Println(testnil4(a)) fmt.Println(testnil5(a)) } 1...
chs[i] =make(chanstring,1) chLimit <-true go limitFunc(chLimit, chs[i], i, sleeptime, timeout) } 这里通过go关键字并发执行的是新构造的函数。他在执行完后,会把chLimit的缓冲区里给消费掉一个。 limitFunc :=func(chLimitchanbool, chchanstring, task_id, sleeptime, timeoutint) { ...
Caution: The keys you specify when you use theSetStringmethod are case and line sensitive, which means that if you try to usePrintLnor add an end of line char\nthen it won’t work: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
A function to determine the manufacturer code might look like this: packagevinfuncManufacturer(vinstring)string{ manufacturer := vin[:3]// if the last digit of the manufacturer ID is a 9// the digits 12 to 14 are the second part of the IDifmanufacturer[2] =='9'{ manufacturer += vin...
这个函数的日期早于errors.Is。它只支持os包返回的错误。新代码应该使用错误。(呃,fs.ErrNotExist)。 八、builtin包 类型 error 内置接口 type error interface { Error() string } 1. 2. 3. error 内置接口类型是表示错误状态的常规接口,nil值表示没有错误。
切片的 0 值为nil。一个nil切片的长度和容量都为 0。可以利用append函数给一个nil切片追加值。 package main import ( "fmt" ) func main() { var names []string //zero value of a slice is nil if names == nil { fmt.Println("slice is nil going to append") ...
func main() { //时间戳 t := time.Now() fmt.Println(t.Weekday().String()) } 运行结果如下：Thursday 时间操作函数 1) Add 我们在日常的开发过程中可能会遇到要求某个时间 + 时间间隔之类的需求，Go语言中的 Add 方法如下：func (t Time) Add(d Duration) Time Add 函数可以返...