从shared_ptr中提取裸指针 [英] Extracting a raw pointer from a shared_ptr

问题描述

可以从 std :: shared_ptr 或 std :: tr1 :: shared_ptr object？目的是告诉智能指针对象，我不想要它来管理对象的生命周期。上下文是，我有一个API，从用户取得一个原始指针，并对该对象进行一些处理。为了使事情更容易管理，API创建一个 shared_ptr 这个原始指针。现在，用户可能要求返回对象。在这种情况下，当将处理后的对象返回给用户时，我想要返回原始指针。但是，我还没有找到办法做到这一点。使用 .get（）是不可能的，因为智能指针将必须无限期地保持活着。我将返回 unique_ptr ，但是在 tr1 中不可用。

Is it possible to extract a raw pointer from a std::shared_ptr or std::tr1::shared_ptr object? The intent is to tell the smart pointer object that I don't want it to manage the lifetime of the object anymore. The context is that I have an API that takes a raw pointer from users and does some processing on the object. To make things easier to manage API creates a shared_ptr out of this raw pointer. Now, the user might ask for the object to be returned. In that case, when giving the processed object back to the user I want to give back the raw pointer. However, I have not found a way to do that. Using .get() is not possible as then the smart pointer will have to be kept alive indefinitely. I would have given back a unique_ptr but that is not available in tr1.

基本上，我想将原指针移出shared_ptr。

Basically I want to move the raw pointer out of the shared_ptr.

推荐答案

shared_ptr 的方法 release（）。对不起 - 没有这样的方法设计。

I think you are searching for the method release() of shared_ptr. Sorry - there is no such method by design.

在这里，我发现了一个有趣的方式来做你想要的 - http：/ /stackoverflow.com/a/13701773/233885 。

Here I found a funny way to do what you want - http://stackoverflow.com/a/13701773/233885.

您应该考虑再次使用 shared_ptr 在您的上下文（所有权）。

You should think about using shared_ptr again in you context (ownership).

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