对标准容器使用std :: unique_ptr [英] Using std::unique_ptr with standard containers

问题描述

我一直在寻找一种方法来做动态指针的安全向量和地图，当我意识到C ++ 11添加 unique_ptr s。我调查了如何在Google上使用它们，但是未能成功查找详细信息。我需要知道的是以下内容：

1. 指针和 unique_ptr s除了自动内存收集？


2. 如何从向量或地图中删除 unique_ptr ？除了擦除迭代器，还有什么特殊的代码需要使用？

解决方案

b

没有。 unique_ptr 只是一个指针的包装，当 unique_ptr 被销毁时会删除指针。它没有开销（就像它替换的 auto_ptr 模板）。

不 - 它只是工作。难度实际上来自将指针插入向量或映射，而您必须将 unique_ptr 移动到

I've been looking for a way to do safe vectors and maps of dynamic pointers, when I realized C++11 adds unique_ptrs. I looked into how to use them on Google, but have been unsuccessful in looking for details. What I need to know are the following:

1. What, exactly, is different between pointers and unique_ptrs besides automatic memory collection?
2. How would I go about removing a unique_ptr from a vector or map? Is there any special code I have to use besides erasing the iterator?

解决方案

1. Nothing. A unique_ptr is just a wrapper around a pointer, which deletes the pointer when the unique_ptr is destroyed. It has no overhead (just like the auto_ptr template it replaces).
2. Nope -- it will just work. The difficulty actually comes from inserting the pointer into the vector or map -- whereas you must move the unique_ptr into the container.

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