切片地址问题

[Greg_han]

s1 := []int{1, 2, 3}
fmt.Printf("&s1=%p\n",&s1)
fmt.Printf("&s1[0]=%p\n",&s1[0])



输出：
&s1=0xc00000a0c0
&s1[0]=0xc000016408

为什s1的地址与s1[0]不同？

[床上等您]

go语言不同于c语言
c：数组指针就是0索引的指针地址

[natpan]

package main import ( "fmt" ) func main() { s1 := []int{1, 2, 3} fmt.Printf("&s1=%p\n", &s1) fmt.Printf("&s1[0]=%p\n", &s1[0]) s2 := s1[:2] s3 := s1 fmt.Println("s2:=S1[:2]") fmt.Printf("&s2=%p\n", &s2) fmt.Printf("&s3=%p\n", &s3) fmt.Printf("&s2[0]=%p\n", &s2[0]) fmt.Printf("&s3[0]=%p\n", &s3[0]) fmt.Println("###typ:") fmt.Printf("s1 type is:%T\n", s1) fmt.Printf("s1[0] type is %T\n", s1[0]) fmt.Printf("s2 type is:%T\n", s2) fmt.Printf("s2[0] type is %T\n", s2[0]) } ######### &s1=0xc42000a060 &s1[0]=0xc420012180 s2:=S1[:2] &s2=0xc42000a080 &s3=0xc42000a0a0 &s2[0]=0xc420012180 &s3[0]=0xc420012180 ###typ: s1 type is:[]int s1[0] type is int s2 type is:[]int s2[0] type is int ### &s1 是 slice的地址 &s1[0] 才是slice中元素的地址。即 slice定义中的指针 array 。 type slice struct { array unsafe.Pointer len int cap int }