Golang言語の学習は、Goの反射の例のチュートリアルをピンダウンする

var a int

type FanOne struct {
	name string
name string }
func main(){	
	var a int = 1
	var d FanOne
	fmt.Println(reflect.TypeOf(a)) // int 
	// Here we get the type of a! Note the type! Not the category! Although this type and category are the same
	// The difference between Type and Kind will be explained later
	fmt.Println(reflect.ValueOf(a).Kind()) //int 
	//This gets the category of a, which is determined by the value of a
	fmt.Println(reflect.TypeOf(d)) //main.FanOne
	// type is main.FanOne is defined inside main FanOne
	fmt.Println(reflect.ValueOf(d).Kind()) //struct
	// The category is struct
	// output the type name and kind of d. The type name is FanOne
	// and FanOne belongs to a class of structures, so the class is struct
}

reflect.TypeOf() //Get the type of the variable, returning reflect.
reflect.ValueOf() //Gets the value of the variable, returning the type reflect.
Kind() //Get the class of the variable, return a constant
reflect.Value.Interface() //convert to interface{} type

reflect.ValueOf(xxx).Elem()

func CreatePrimitiveObjects(t reflect.Type) reflect.Value {
    return reflect.Zero(t)
}

reflect.New()

package main

import (
	"fmt"
	"reflect"
)

func FanOne() string {
	return "One-click triple"
}

func FanOneWoW(a string) string {
	return fmt.Sprintf("%s to give FanOne a one-button triplet~",a)
}

func main() {
	FanOneNotArgs := reflect.ValueOf(FanOne).Call([]reflect.Value{}) //no arguments
	FanOneHaveArgs := reflect.ValueOf(FanOneWoW).Call([]reflect.Value{reflect.ValueOf("I")}) //with arguments
	fmt.Println(FanOneNotArgs[0])
	fmt.Println(FanOneHaveArgs[0])
}

func fn(callback interface{}, bytes []byte) {
		//coding
}
type aaa struct {
	Name string `json:"name"`
	Age int `json:"age"`
}
func Test(t *testing.T) {
		fn(func(a []*aaa) string {
		aaas := a
		for i, item := range aaas {
			fmt.Println(i, item)
		}
		fmt.Println("12312312, ", aaas)
		return "xxxx"
	}, []byte("[{\"name\":\"111\",\"age\":1}, {\"name\":\"gsjk\",\"age\" ;:2}]"))

	fn(func(a []aaa) string {
		aaas := a
		for i, item := range aaas {
			fmt.Println(i, item)
		}

		fmt.Println("12312312, ", aaas[0])
		return "xxxx"
	}, []byte("[{\"name\":\"111\",\"age\":1}, {\"name\":\"gsjk\",\"age\" ;:2}]"))

	fn(func(a * aaa) string {
		fmt.Println("12312312, ", a)
		aaas := a
		fmt.Println("12312312, ", aaas)
		return "xxxx"
	}, []byte("{\"name\":\"gsjk\",\"age\":2}"))

	fn(func(a string) string {
		fmt.Println("12312312, ", a)
		aaas := a
		fmt.Println("12312312, ", aaas)
		return "xxxx"
	}, []byte("\"ssss\""))

	fn(func(a int) string {
		fmt.Println("-----------, ", a)
		aaas := a
		fmt.Println("-----------, ", aaas)
		return "xxxx"
	}, []byte("123"))
}

go test xxx_test.go
go test -v xxx_test.go

func(a []*aaa) string {
		aaas := a
		for i, item := range aaas {
			fmt.Println(i, item)
		}
		fmt.Println("12312312, ", aaas)
		return "xxxx"
	}, []byte("[{\"name\":\"111\",\"age\":1}, {\"name\":\"gsjk\",\"age\" ;:2}]"))

func fn(callback interface{}, bytes []byte) {
	v := reflect.ValueOf(callback) //0xbaff40
	t := reflect.TypeOf(callback) //func([]*main.aaa) string
}

paramsValue := t.In(0) //[]*main.aaa

	val := reflect.New(paramsValue)
	newT := val.Interface()
	fmt.Printf("valValue:%v , valType: %T \n",val,val) //valValue:&[] , valType: reflect.Value
	fmt.Printf("newTValue:%v , newTType: %T \n",newT,newT)//newTValue:&[] , newTType: *[]*main.aaa

	if v.IsValid() { //function valid or not
		_ = json.Unmarshal(bytes, newT) //byte to json
	}

	fmt.Printf("Call callback end callback ret = %s \n", v.Call([]reflect.Value{reflect.ValueOf(newT)}))
	fmt.Printf("*************************\n")

package main

import (
  "fmt"
  "reflect"
)

func main(){
  var a int = 1
  var b *int = &a
  var c **int = &b
  fmt.Println(a, *b, c)
  fmt.Println(reflect.TypeOf(a))
  fmt.Println(reflect.TypeOf(*b))
  fmt.Println(reflect.TypeOf(b))
}

if