interface{} 转换为 unsafe.Pointer 问题

Question

我正在做一些关于 unsafe.Pointer 的测试。假设TestFun是一个公共库函数，那么“Person”结构体不应该出现在这个函数中type Person struct {    Name string}func main() {    p := &Person{}    p.Name = "TestName"    TestFun(p)}func TestFun(val interface{}) {    // I want to convert interface{} to unsafe.Pointer    var pointer unsafe.Pointer    // This Line compile error    //pointer = unsafe.Pointer(val)    // This is ok, but "Person" appears. This function is a common function, "Person" should not appear    // pointer = unsafe.Pointer(val.(*Person))    println(pointer)}我怎么能这样做呢？

Answer 1

而不是unsafe.Pointer(val)使用unsafe.Pointer(&val). 因为它接受指针。

package main

import (

    "unsafe"

)

type Person struct {

    Name string

}

func main() {

    p := &Person{}

    p.Name = "TestName"

    TestFun(p)

}

func TestFun(val interface{}) {

    // I want to convert interface{} to unsafe.Pointer

    var pointer unsafe.Pointer

    pointer = unsafe.Pointer(&val)

    println(pointer)

    u := (*interface{})(pointer)

    p := (*u).(*Person)

    println(p.Name)

}