ttttt #Merge branch 'master' of https://github.com/SisMaker/goUtils

src/docs/go方法.md

@@ -6,3 +6,12 @@
     而且为防止混淆 不允许本身是指针的类型进行方法声明
     type P *int
     func (p P) f() {/* ... */} //编译错误 非法的接受者类型
+    
+# 方法集
+    类型有一个与之相关的方法集（method set） 这决定了他是否实现了某个接口
+    
+    类型T方法集包含了所有 receiver T方法
+    类型*T方法集包含了所有receiver T + *T方法
+    匿名嵌入S， T方法集包含了所有 receiver S方法
+    匿名嵌入*S, T方法集包含了所有receiver S + *S方法
+    匿名嵌入S或*S, *T方法集包含了所有receiver S+ *S方法

src/go.mod

@@ -0,0 +1,3 @@
+module goUtils
+
+go 1.12

src/learn/addrOp.go

@@ -2,7 +2,7 @@ package main
 
 import "fmt"
 
-func main(){
+func main() {
 	var a int = 4
 	var b int32
 	var c float32
@@ -13,7 +13,7 @@ func main(){
 	fmt.Printf("第三行 -c 变量类型为 %T\n", c)
 
 	ptr = &a
-	fmt.Printf("a的值为 %d \n",a)
+	fmt.Printf("a的值为 %d \n", a)
 	fmt.Printf("ptr为 %d\n", *ptr)
 	fmt.Printf("ptr %d\n", ptr)
-}
+}

src/learn/ariOp.go

@@ -12,7 +12,7 @@ func main() {
 	fmt.Printf("第 2222  c 的值 %d \n", c)
 	c = a * b
 	fmt.Printf("第 3333  c 的值 %d \n", c)
-	c = a*1.0 / b
+	c = a * 1.0 / b
 	fmt.Printf("第 4444  c 的值 %d \n", c)
 	c = a % b
 	fmt.Printf("第 5555  c 的值 %d \n", c)

src/learn/array.go

@@ -11,9 +11,12 @@ func main() {
 
 	}
 	//var tet , bb int = 1, 2
-	var (tet int; bb string)
+	var (
+		tet int;
+		bb  string
+	)
 	print(tet, bb)
-	months := [...]string{1:"January", 12:"December"}
+	months := [...]string{1: "January", 12: "December"}
 	Q2 := months[4:7]
 	fmt.Println("%T %T", months, Q2)
 

src/learn/charCount.go

@@ -12,7 +12,6 @@ import (
 var g = make(map[string]map[string]map[string]bool)
 var s = []uint{1}
 
-
 func main() {
 	counts := make(map[rune]int)
 	var utflen [utf8.UTFMax + 1]int
@@ -55,5 +54,4 @@ func main() {
 
 	}
 
-
 }

src/learn/constVar.go

@@ -5,7 +5,7 @@ import (
 	"unsafe"
 )
 
-const(
+const (
 	a1 = "abc"
 	b1 = len(a1)
 	c1 = unsafe.Sizeof(a1)

src/learn/fetch.go

@@ -1,23 +1,25 @@
 package main
-import(
+
+import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"os"
 )
-func main(){
-	for _, url := range os.Args[1:]{
+
+func main() {
+	for _, url := range os.Args[1:] {
 		resp, err := http.Get(url)
-		if err != nil{
+		if err != nil {
 			fmt.Fprintf(os.Stderr, "fetch:%v\n", err)
 			os.Exit(1)
 		}
 		b, err := ioutil.ReadAll(resp.Body)
 		resp.Body.Close()
-		if err != nil{
+		if err != nil {
 			fmt.Fprintf(os.Stderr, "fetch: reading %s: %v\n", url, err)
 			os.Exit(1)
 		}
 		fmt.Printf("IMY****\n %s\n", b)
 	}
-}
+}

src/learn/fetch2.go

@@ -1,5 +1,6 @@
 package main
-import(
+
+import (
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -8,29 +9,29 @@ import(
 	"time"
 )
 
-func main()  {
+func main() {
 	start := time.Now()
 	ch := make(chan string)
-	for _, url := range os.Args[1:]{
-		go fetch(url, ch)	// 启动一个goroutine
+	for _, url := range os.Args[1:] {
+		go fetch(url, ch) // 启动一个goroutine
 	}
-	for range os.Args[1:]{
-		fmt.Println(<- ch)
+	for range os.Args[1:] {
+		fmt.Println(<-ch)
 
 	}
 	fmt.Printf("IMY*****main* %2fs elapsed\n", time.Since(start).Seconds())
 }
 
-func fetch(url string, ch chan <- string){
+func fetch(url string, ch chan<- string) {
 	start := time.Now()
 	resp, err := http.Get(url)
-	if err != nil{
+	if err != nil {
 		ch <- fmt.Sprint(err) // 发送到通道ch
 		return
 	}
 	nbytes, err := io.Copy(ioutil.Discard, resp.Body)
-	resp.Body.Close()	//不要泄露资源
-	if err != nil{
+	resp.Body.Close() //不要泄露资源
+	if err != nil {
 		ch <- fmt.Sprintf("while reading %s %v", url, err)
 		return
 
@@ -38,4 +39,4 @@ func fetch(url string, ch chan <- string){
 	secs := time.Since(start).Seconds()
 
 	ch <- fmt.Sprintf("IMY***fetch*  %.2fs, %7d %s ", secs, nbytes, url)
-}
+}

src/learn/geometry/geometry/geometry.go

@@ -2,7 +2,7 @@ package geometry
 
 import "math"
 
-type Point struct {X, Y float64}
+type Point struct{ X, Y float64 }
 
 // 普通函数
 func Distance(p, q Point) float64 {
@@ -32,4 +32,4 @@ func (path Path) Distance() float64 {
 func (p *Point) ScaleBy(factor float64) {
 	p.X *= factor
 	p.Y *= factor
-}
+}

src/learn/hello.go

@@ -1,6 +1,7 @@
 package learn
+
 import "fmt"
 
-func main(){
+func main() {
 	fmt.Println("hello world!")
 }

src/learn/interface/io/io.go

@@ -1,4 +1,5 @@
 package io
+
 type Reader interface {
 	Read(p []byte) (n int, err error)
 }
@@ -11,7 +12,7 @@ type Closer interface {
 	Close() error
 }
 
-type ReadWriter interface{
+type ReadWriter interface {
 	Reader
 	Writer
 }
@@ -28,5 +29,3 @@ type ReadWriteCloser2 interface {
 	Writer
 	Close() error
 }
-
-

src/learn/method.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+type N int
+
+func (n N) value() {
+	n++
+	fmt.Println("v: %p %v \n ", &n, n)
+}
+
+func (n *N) pointer() {
+	(*n)++
+	fmt.Println("v: %p %v \n ", n, *n)
+
+}
+
+func main() {
+	var a N = 25
+	p := &a
+	p2 := &p
+	(*p2).value()
+	(*p2).pointer()
+
+}

src/learn/methodSet.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+type S struct{}
+
+type T struct {
+	S
+}
+
+func (S) sVal()  {}
+func (*S) sPtr() {}
+func (T) tVal()  {}
+func (*T) tPtr() {}
+
+func methodSet(I interface{}) {
+	t := reflect.TypeOf(I)
+	fmt.Println(t)
+	for i, n := 0, t.NumMethod(); i < n; i++ {
+		m := t.Method(i)
+		fmt.Println(m.Name, m.Type)
+	}
+}
+
+func main() {
+	var t T
+	methodSet(t)
+	println("-----------------")
+	methodSet(&t)
+}

src/learn/mulVar.go

@@ -1,9 +1,9 @@
 package main
 
 var x, y int
-var (  // 这种因式分解关键字的写法一般用于声明全局变量
-    a int
-    b bool
+var ( // 这种因式分解关键字的写法一般用于声明全局变量
+	a int
+	b bool
 )
 
 var c, d int = 1, 2
@@ -12,7 +12,7 @@ var e, f = 123, "hello"
 //这种不带声明格式的只能在函数体中出现
 //g, h := 123, "hello"
 
-func main(){
-    g, h := 123, "hello"
-    println(x, y, a, b, c, d, e, f, g, h)
-}
+func main() {
+	g, h := 123, "hello"
+	println(x, y, a, b, c, d, e, f, g, h)
+}

src/learn/overMethod.go

@@ -0,0 +1,53 @@
+package main
+
+type Str interface {
+	toStr()
+	add()
+}
+
+type user struct {
+	a int
+	b string
+}
+
+type manger struct {
+	*user
+	aa int
+	bb string
+}
+
+func (u user) toStr() {
+	println("IMY********user", u.a, " ", u.b)
+}
+
+func (u user) add() {
+	println("IMY********user222", u.a, " ", u.b)
+}
+
+func (m manger) toStr() {
+	println("IMY********manger")
+}
+
+func overa(s Str) {
+	println("TEST********", s)
+	s.toStr()
+}
+
+func overb(s Str) {
+	println("TEST********", s)
+	s.add()
+}
+
+func main() {
+	var m manger = manger{&user{22, "22uuuuuuuu"}, 1, "mmmmm"}
+	var u user = user{2, "uuuuuuuuu"}
+
+	u.toStr()
+	m.toStr()
+
+	overa(m)
+	overa(u)
+
+	overb(u)
+	overb(m)
+}

src/learn/slice.go

@@ -34,17 +34,27 @@ func remove(slice []int, i int) []int {
 	return slice[:len(slice)-1]
 }
 
-func remove2(slice []int, i int) []int{
-	slice[i] = slice[len(slice) - 1]
-	return slice[:len(slice) - 1]
+func remove2(slice []int, i int) []int {
+	slice[i] = slice[len(slice)-1]
+	return slice[:len(slice)-1]
 
 }
 
-func main(){
+func main() {
 	s := []int{5, 6, 7, 8, 9}
 
 	fmt.Println(s[:len(s)])
 
 	fmt.Println(remove2(s, 2))
 
-}
+	m := map[string][2]int{
+		"a": {1, 2},
+		"b": {3, 4},
+	}
+	s1 := m["a"]
+	s2 := s1[:]
+	fmt.Printf("sssss %v %v \n", s1, s2)
+
+	ssss := [][][][][][]int{}
+	fmt.Printf("%T \n", ssss)
+}

src/learn/struct.go

@@ -1,24 +1,22 @@
 package main
 
 import (
-	"fmt"
 	"time"
 )
 
-type Emplyee struct{
-	Id int
-	Name string
-	Address string
-	Dob time.Time
-	Position string
-	Salary int
+type Emplyee struct {
+	Id        int
+	Name      string
+	Address   string
+	Dob       time.Time
+	Position  string
+	Salary    int
 	ManagerId int
 }
 
 var dilbert Emplyee
 
-
-func test(){
+func test() {
 	dilbert.Salary -= 5000
 	posPtr := &dilbert.Position
 	*posPtr = "fdfdsfdfd" + *posPtr
@@ -32,11 +30,9 @@ func test(){
 
 	//没有任何成员变量的结构体成为空结构体
 	set := make(map[string]struct{})
-	if _, ok := set[str]; !ok{
+	if _, ok := set[str]; !ok {
 		set[str] = struct{}{}
 
 	}
 
 }
-
-

src/learn/structs.go

@@ -2,14 +2,14 @@ package main
 
 import "fmt"
 
-type Books struct{
-	title string
-	author string
+type Books struct {
+	title   string
+	author  string
 	subject string
 	book_id int
 }
 
-func main(){
+func main() {
 	var Book1 Books
 	var Book2 Books
 
@@ -24,16 +24,15 @@ func main(){
 	Book2.book_id = 464513
 
 	/* 打印 Book1 信息 */
-	fmt.Printf( "Book 1 title : %s\n", Book1.title)
-	fmt.Printf( "Book 1 author : %s\n", Book1.author)
-	fmt.Printf( "Book 1 subject : %s\n", Book1.subject)
-	fmt.Printf( "Book 1 book_id : %d\n", Book1.book_id)
+	fmt.Printf("Book 1 title : %s\n", Book1.title)
+	fmt.Printf("Book 1 author : %s\n", Book1.author)
+	fmt.Printf("Book 1 subject : %s\n", Book1.subject)
+	fmt.Printf("Book 1 book_id : %d\n", Book1.book_id)
 
 	/* 打印 Book2 信息 */
-	fmt.Printf( "Book 2 title : %s\n", Book2.title)
-	fmt.Printf( "Book 2 author : %s\n", Book2.author)
-	fmt.Printf( "Book 2 subject : %s\n", Book2.subject)
-	fmt.Printf( "Book 2 book_id : %d\n", Book2.book_id)
-
+	fmt.Printf("Book 2 title : %s\n", Book2.title)
+	fmt.Printf("Book 2 author : %s\n", Book2.author)
+	fmt.Printf("Book 2 subject : %s\n", Book2.subject)
+	fmt.Printf("Book 2 book_id : %d\n", Book2.book_id)
 
 }

src/learn/var.go

@@ -1,5 +1,7 @@
 package main
+
 import "fmt"
+
 func main() {
 
 	// 声明一个变量并初始化
@@ -22,7 +24,7 @@ func main() {
 
 	var a1 *int
 	var a2 []int
-	var a3 map[string] int
+	var a3 map[string]int
 	var a4 chan int
 	var a5 func(string) int
 	var a6 error // error 是接口