Golang中的不可变结构 [英] Immutable Struct in Golang

问题描述

是否可以在Golang中定义一个不变的结构?一旦初始化，则只能对struct的字段进行读取操作，而无需修改字段值.如果是这样，该怎么做.

Is it possible to define an immutable struct in Golang? Once initialized then only read operation on struct's field, no modification of field values. If so, how to do that.

推荐答案

可以通过使其成员不导出并提供读者来使结构在其包之外成为只读结构.例如:

It is possible to make a struct read-only outside of its package by making its members non-exported and providing readers. For example:

package mypackage

type myReadOnly struct {
  value int
}

func (s myReadOnly) Value() int {
  return s.value
}

func NewMyReadonly(value int) myReadOnly{
  return myReadOnly{value: value}
}

和用法:

myReadonly := mypackage.NewMyReadonly(3)
fmt.Println(myReadonly.Value())  // Prints 3

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