sum packages package lists and patterns private configuration for downloading non-public code testflag testing flags testfunc testing functions vcs controlling version control with GOVCS Use "go help <topic>" for more information about that topic. 其中和编译相关的有build、get、install、run这4个。接...
funcCheckImageFile(path,style string)(string,error){f,err:=os.Open(path)iferr!=nil{fmt.Errorf("打开文件失败 %s",err.Error())}switchstrings.ToUpper(style){case"JPG","JPEG":_,err=jpeg.Decode(f)case"PNG":_,err=png.Decode(f)case"GIF":_,err=gif.Decode(f)}iferr!=nil{fmt.Errorf(...
select与switch具有相似的控制结构,与switch不同的是,select中的case中的表达式必须是channel的收发操作,当select中的两个case同时被触发时,会随机执行其中的一个。为什么是随机执行的呢?随机的引入就是为了避免饥饿问题的发生,如果我们每次都是按照顺序依次执行的,若两个case一直都是满足...
A "select" statement chooses which of a set of possible send or receive operations will proceed. It looks similar to a "switch" statement but with the cases all referring to communication operations. 其实很类似于switch语句,只不过case语句上有些差别——case只能引用通信操作。什么是“通信操作”呢?
starting withHello Worldbut also containing a few easy algorithms. TheAdvancedsection uses more complicated features of Golang. Finally, theExpertsection contains applications like telnet-clients or http-server (even with SSL). If you want even more Golang examples, you can take a look at my ...
typeMyErrorstruct{When time.TimeWhatstring}func(e *MyError)Error()string{returnfmt.Sprintf("%v : %v\n", e.When, e.What)}functest()error{return&MyError{When: time.Now(), What:"test error"}}funcmain(){err := test()switcherr.(type) {casenil:fmt.Println("nil")case*MyError:fmt....
switch v := p.(type) { case int: fmt.Println("Integer", v) case string: fmt.Println("String", v) default:fmt.Println("Unknow Type") } } // 使用 DoSomething("10") 2:空接口可以接受任何类型的值: var yzj interface{} // 空接口的使用,空接口类型的变量可以保存任何类型的值,空格口类...
We go through the string elements withfor rangeloop. switch e { case ' ', '\t', '\n': break If we encounter the specified three white spaces, we terminate theswitchstatement withbreak. $ go run explicit_break.go a b c d e
master .github api doc lib misc src archive arena bufio builtin bytes cmd cmp compress container context crypto database debug embed encoding errors expvar flag example_flagset_test.go example_func_test.go example_test.go example_textvar_test.go ...
(allocated) FingerPrintDB containing the results. They exit withan error message in the case of error. */FingerPrintDB*parse_fingerprint_file(constchar*fname);/* Compares 2 fingerprints -- a referenceFP (can have expressionattributes) with an observed fingerprint (no expressions). Ifverbose is...