pair和reflect

bilibili/aceid/struct/pair/test.go

@@ -0,0 +1,40 @@
+package main
+
+import "fmt"
+
+type Reader interface {
+	ReadBook()
+}
+
+type Writer interface {
+	WriteBook()
+}
+
+// 具体类型
+type Book struct {
+}
+
+func (this *Book) ReadBook() {
+	fmt.Println("Read a Book")
+}
+
+func (this *Book) WriteBook() {
+	fmt.Println("Write a Book")
+}
+
+func main() {
+	// b: pair<type: Book, value: book{}地址>
+	b := &Book{}
+
+	// r: pair<type: , value: >
+	var r Reader
+	// r: pair<type: Book, value: book{}地址>
+	r = b
+
+	r.ReadBook()
+
+	var w Writer
+	// r: pair<type: Book, value: book{}地址>
+	w = r.(Writer) // 此处的断方为什么会成功？因为w r的具体type是一致的
+	w.WriteBook()
+}

bilibili/aceid/struct/reflect/test.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+func main() {
+	var a string
+	// pair<statictype: string, value: "aceld">
+	a = "aceld"
+
+	// pair<type: string, value "aceld">
+	var allType interface{}
+	allType = a
+	str, _ := allType.(string)
+	fmt.Println(str)
+
+	// type: pair<type:*os.File, value: "/dev/tty"文件描述符>
+	tty, err := os.OpenFile("/dev/tty", os.O_RDWR, 0)
+	if err != nil {
+		fmt.Println("open file error", err)
+		return
+	}
+
+	// r: pair<type: , value: >
+	var r io.Reader
+	// r: pair<type:*os.File , value:"/dev/tty"文件描述符>
+	r = tty
+	// w: pair<type: , value: >
+	var w io.Writer
+	// w: pair<type:*os.File, value:"/dev/tty"文件描述符>
+	w = r.(io.Writer)
+	w.Write([]byte("HELLO THIS is A TEST!!!\n"))
+	r.(io.Writer).Write([]byte("HELLO THIS is A TEST, too!!!\n"))
+}