在哪里删除工厂创建的对象？ [英] Where to delete an object created by factory?

问题描述

如果我有一个工厂，创建一个对象并返回一个指针，它会是一个更好的方式来删除它：

If I have a factory, that creates an object and returns a pointer to it, what will be a better way to delete it:

由 delete 在用户代码中调用，或者通过一个新的 DestructObject 函数，

By delete call in the "user" code, or by a new DestructObject function which I should have together with the factory?

推荐答案

在一般情况下，工厂可能不使用纯旧 new 目的。它可以使用放置 new 的对象和/或页面池， malloc ，或者更奇怪的内存映射）。有至少三种方法来处理这个问题，我可以想到：

In the general case, the factory might not use plain old new to allocate the object. It may use object and/or page pooling, malloc with placement new, or something even more exotic (memory mapping?). There are at least three ways to handle this that I can think of:

1. 让工厂提供 recycle 方法。


2. 返回一个智能指针，知道如果没有查询器保留，如何删除该对象。


3. 在对象本身中实现自定义删除运算符。

1. Have the factory supply a recycle method to be called when you are done with the object.
2. Return a smart pointer that knows how to do away with the object once no referers remain.
3. Implement a custom delete operator in the object itself.

$ b b我不犹豫的推荐一个在另一个，因为我没有给予足够的思想在最后五分钟提供一个确定的意见，但我倾向于喜欢最后一个选项结合一个常规的智能指针，如boost / tr1 :: shared_ptr。

I hesitate to recommend one over the other, since I haven't given it enough thought in the last five minutes to proffer a definitive opinion, but I would tend to favour the last option in combination with a regular smart pointer like boost/tr1::shared_ptr.

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