Import cycle - cruisechang/wiki-golang GitHub Wiki

Golang forces programer do not cross import code.

If that a 'Import cycle' error occurred when compile.

In that case we need to modify our structure of program to avoid 'Import cycle'.

'Import cycle' forces us to struct a clear structure.

It's a good way make our code better.

But what if we got a 'Import cycle' error?

Method 1

Make a clear be-imported only file which is imported by other files.

So other files no need to import file with cycle error.

建立一個中介的介面檔。

把共用的struct放到這裡，供程式import。

使用類似delegate的方式，把程式引入這裡，供其他程式呼叫。

//Put common struc here.
type People struct{
    name string
    year int
}

//declare a func type
type delegateFoo func(id string, num int)  error

//declare a var of delegateFoo.
var foo delegateFoo

//Set this var by other one.
func SetFoo(function delegateFoo) {
	foo = function
}

//Another one can call var by this way.
func Foo (id string,num int){
       foo(id,num)
}

Method 2