如何在Ruby中创建对象的深层副本？ [英] How to create a deep copy of an object in Ruby?

问题描述

我做了一些搜索，发现了一些不同的方法和关于创建深复制操作符的帖子。

I did some searching found some different methods and posts about creating a deep copy operator.

有一个快速和容易Ruby中的对象？这些字段不是数组或哈希。

Is there a quick and easy (built-in) way to deep copy objects in Ruby? The fields are not arrays or hashes.

使用Ruby 1.9.2。

Working in Ruby 1.9.2.

推荐答案

深度副本不是内置到香草Ruby中，但您可以通过编组和解组对象来破解：

Deep copy isn't built into vanilla Ruby, but you can hack it by marshalling and unmarshalling the object:

Marshal.load(Marshal.dump(@object))

这不是完美的，将不会为所有对象工作。更健壮的方法：

This isn't perfect though, and won't work for all objects. A more robust method:

class Object
  def deep_clone
    return @deep_cloning_obj if @deep_cloning
    @deep_cloning_obj = clone
    @deep_cloning_obj.instance_variables.each do |var|
      val = @deep_cloning_obj.instance_variable_get(var)
      begin
        @deep_cloning = true
        val = val.deep_clone
      rescue TypeError
        next
      ensure
        @deep_cloning = false
      end
      @deep_cloning_obj.instance_variable_set(var, val)
    end
    deep_cloning_obj = @deep_cloning_obj
    @deep_cloning_obj = nil
    deep_cloning_obj
  end
end

资料来源：

http://blade.nagaokaut.ac.jp /cgi-bin/scat.rb/ruby/ruby-list/43424

这篇关于如何在Ruby中创建对象的深层副本？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！