当我意识到 C++11 添加了 unique_ptr 时，我一直在寻找一种方法来实现动态指针的安全向量和映射。我在谷歌上研究了如何使用它们，但没有成功地找到细节。我需要知道以下内容：
- 除了自动内存收集之外，指针和 unique_ptr 之间到底有什么不同？
- 我该如何从矢量或地图中删除
unique_ptr ？除了擦除迭代器之外，我还必须使用任何特殊代码吗？
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:
- What, exactly, is different between pointers and
unique_ptrs besides automatic memory collection?
- 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?
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unique_ptr只是指针的包装器，当unique_ptr被销毁时，它会删除指针。它没有任何开销（就像它所替换的 auto_ptr 模板一样）。unique_ptr移动到容器中。unique_ptris just a wrapper around a pointer, which deletes the pointer when theunique_ptris destroyed. It has no overhead (just like theauto_ptrtemplate it replaces).unique_ptrinto the container.不同之处在于 unique_ptr 遵循移动语义。此外，顾名思义，您无法复制它。
删除
std::vector的元素> 将有效删除指针所指向的任何内容。The difference is that unique_ptr obeys move semantics. Further, as the name suggests, you can't make copies of it.
Erasing an element of
std::vector<std::unique_ptr<T> >will effectively delete whatever that pointer pointed at.