go - 取字符串中某个字符的地址

Question

package main
import (
    "fmt"
)
func main(){
    var str string = "hello,world"
    fmt.Println(&str)
    fmt.Println(&str[0])
}

我是一个完全的 golang 菜鸟。刚开始学了几个天。这是我的问题:

compiled error: cannot take the address of str[0]

我搜索了<<要走的路>>。它说你不能接受字符串中字符的地址。为什么不允许？

另一个困惑是，一旦你创建了一个字符串，你不能再修改了。这是否意味着字符串是常量空间？

Answer 1

是的，这在 Go 文档中是正确的，您可以看到

A string type represents the set of string values. A string value is a (possibly empty) sequence of bytes. Strings are immutable: once created, it is impossible to change the contents of a string. The predeclared string type is string.

The length of a string s (its size in bytes) can be discovered using the built-in function len. The length is a compile-time constant if the string is a constant. A string's bytes can be accessed by integer indices 0 through len(s)-1. It is illegal to take the address of such an element; if s[i] is the i'th byte of a string, &s[i] is invalid.

希望能解决你的疑惑