package main

import (
    "fmt"
    "unsafe"
)

func main() {
    var value int64 = 5
    var p1 = &value
    var p2 = (*int32)(unsafe.Pointer(p1))

    fmt.Println("*p1: ", *p1)
    fmt.Println("*p2: ", *p2)
    *p1 = 5434123412312431212
    fmt.Println(value)
    fmt.Println("*p2: ", *p2)
    *p1 = 54341234
    fmt.Println(value)
    fmt.Println("*p2: ", *p2)
}

返回指針

package main

import (
    "fmt"
)

func returnPtr(x int) *int {
    y := x * x
    return &y
}

func main() {
    sq := returnPtr(10)
    fmt.Println("sq:", *sq)

    fmt.Println("sq:", sq)
}