package main

import "fmt"

func main() {

	s := []string{"1", "2", "3", "4", "5", "6", "7", "8", "9"} //定义切片

	fmt.Printf("%v \n", s)

	s1 := s[0:5]

	fmt.Printf("%v \n", s1)

	s2 := make([]string, len(s1))

	copy(s2, s1)  //slice can use copy

	fmt.Printf("%v \n", s2)

	s2 = s1       //slice can use operator =

	fmt.Printf("%v \n", s2)

	if &s1 == &s2 {

		fmt.Println("the silce share the same address")

	} else {

		fmt.Println("the silce does not share the same address")

	}

	if &s1 == &s {

		fmt.Println("the silce share the same address")

	} else {

		fmt.Println("the silce does not share the same address")

	}

	type sliceTest struct {

		number   int

		sliceNum []string

	}

	var sliceTest1 sliceTest

	var sliceTest2 sliceTest

	sliceTest1.number = 1

	sliceTest1.sliceNum = s1

	fmt.Printf("%v \n", sliceTest1)

	sliceTest2 = sliceTest1

	fmt.Printf("%v \n", sliceTest2)

	sliceTest3 := sliceTest1

	fmt.Printf("%v \n", sliceTest3)

	//var sliceTest4 sliceTest

	//	copy(sliceTest4, sliceTest1) //compil error:arguments to copy must be slices

	//	fmt.Printf("%v \n", sliceTest4)

}

C:/Go/bin/go.exe build -i [E:/staff/xc/1.12]

成功: 进程退出代码 0.

E:/staff/xc/1.12/1.12.exe [E:/staff/xc/1.12]

[1 2 3 4 5 6 7 8 9]

[1 2 3 4 5]

[1 2 3 4 5]

[1 2 3 4 5]

the silce does not share the same address

the silce does not share the same address

{1 [1 2 3 4 5]}

{1 [1 2 3 4 5]}

{1 [1 2 3 4 5]}

成功: 进程退出代码 0.

总结：

1.slice可以用copy和操作符=

2.结构体只能用=，不能用copy

3.虽然从silce中取一个小的slice的确是共用一个内存，但是他们采用指针的方式来进行指向，而指针的地址是不同的。

如下图所示：

一个slice由三个部分构成：指针、长度和容量。