pointers - Go中的指针算法

Question

考虑到您可以(想不出一个很好的表达方式，但是)在 Go 中操作指针，是否可以像在 C 中那样执行指针运算，比如遍历数组？我知道这些天循环很适合这种事情，但我只是好奇它是否可能。

Answer 1

没有。来自 Go FAQ :

Why is there no pointer arithmetic?

Safety. Without pointer arithmetic it's possible to create a language that can never derive an illegal address that succeeds incorrectly. Compiler and hardware technology have advanced to the point where a loop using array indices can be as efficient as a loop using pointer arithmetic. Also, the lack of pointer arithmetic can simplify the implementation of the garbage collector.

话虽如此，您可以使用 unsafe 来解决这个问题。包，但只是不要:

package main

import "fmt"
import "unsafe"

func main() {
    vals := []int{10, 20, 30, 40}
    start := unsafe.Pointer(&vals[0])
    size := unsafe.Sizeof(int(0))
    for i := 0; i < len(vals); i++ {
        item := *(*int)(unsafe.Pointer(uintptr(start) + size*uintptr(i)))
        fmt.Println(item)
    }
}

https://play.golang.org/p/QCHEQqy6Lg