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。
