golang 突破私有成员

GoLang 强制类型转换:unsafe.Pointer

package main

import (
    "fmt"
    "text/template"
    "unsafe"
)
// MyTemplate 定义和 template.Template 只是形似
type MyTemplate struct {
    name       string
    parseTree  *unsafe.Pointer
    common     *unsafe.Pointer
    leftDelim  string
    rightDelim string
}

func main() {
    t := template.New("Foo")
    p := (*MyTemplate)(unsafe.Pointer(t))
    p.name = "Bar" // 关键在这里，突破私有成员
    fmt.Println(p, t)
}