Golang Tips-Interface function

Interface function: Refers to the implementation of the interface with a function, so that the call is very simple, this function is an interface type function, this method is applicable to only one function of the interface.

Defines a type that defines only the parameter list of a function, and the function argument list is consistent with the method defined by the interface:

Type Handlerfunc func (k, v interface{})

And then this type goes to implement the interface, the implemented function calls itself

The Func (HF Handlerfunc) do (k, v interface{}) {HF (k, V)  ///interface is called itself in the implementation. This makes it possible to use functions to implement interface functions, rather than defining types and implementing interfaces to implement interface functions}

This allows you to implement interface functions in two ways

Func each (MP map[interface{}]interface{}, H Handler) {//pass in an instance of a type that implements the Handler interface}func Eachfunc (MP map[interface{}] interface{}, Handlerfunc Handlerfunc)  {//passed in a parameter list as required by the interface to implement the function}

The second way can only pass in a function, only requires the same parameter list, function name can be random, type is not new definition, easy to use.

The complete code is as follows;

Package Mainimport ' FMT ' type Handler interface {Do (k, v interface{})}type handlerfunc func (k, v interface{}) func (HF Hand Lerfunc) does (K, v interface{}) {HF (k, V)}func each (MP map[interface{}]interface{}, h Handler) {if MP! = Nil && len ( MP) > 0 {for k, V: = Range MP {h.do (k, v)}}}func Eachfunc (MP map[interface{}]interface{}, Handlerfunc Handlerfunc)  {if MP! = Nil && len (MP) > 0 {for k, V: = Range MP {Handlerfunc (k, v)}}}func Selfinfo (k, v interface{}) {FMT. Printf ("My name is%s, I am%d years old", K, v) fmt. PRINTLN ()}func main () {MP: = map[interface{}]interface{}{"Gaoziwen": "Zhangsan": "Lisi": 28,}f: = Selfinfoeachfunc (MP, F)}