C++ auto_ptr 被弃用了吗？
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Is auto_ptr deprecated?
提问by dimba
- Will auto_ptr be deprecated in incoming C++ standard?
- Should unique_ptr be used for ownership transfer instead of shared_ptr?
- If unique_ptr is not in the standard, then do I need to use shared_ptr instead?
- auto_ptr 在传入的 C++ 标准中会被弃用吗？
- 是否应该使用 unique_ptr 而不是 shared_ptr 进行所有权转让？
- 如果 unique_ptr 不在标准中，那么我是否需要使用 shared_ptr 代替？
采纳答案by David Rodríguez - dribeas
UPDATE: This answer was written in 2010 and as anticipated std::auto_ptrhas been deprecated. The advice is entirely valid.
更新：这个答案是在 2010 年写的，正如预期的那样std::auto_ptr已被弃用。该建议完全有效。
In C++0x std::auto_ptrwill be deprecated in favor of std::unique_ptr. The choice of smart pointer will depend on your use case and your requirements, with std::unique_ptrwith move semantics for single ownership that can be used inside containers (using move semantics) and std::shared_ptrwhen ownership is shared.
在 C++0xstd::auto_ptr中将被弃用，以支持std::unique_ptr. 智能指针的选择将取决于您的用例和您的要求，具有std::unique_ptr可在容器内使用的单一所有权的移动语义（使用移动语义）以及std::shared_ptr何时共享所有权。
You should try to use the smart pointer that best fits the situation, choosing the correct pointer type provides other programmers with insight into your design.
您应该尝试使用最适合这种情况的智能指针，选择正确的指针类型可以让其他程序员深入了解您的设计。
回答by R Samuel Klatchko
Yes, as of today auto_ptrwill be deprecated in C++0x and you should use unique_ptrinstead. From the latest draft standard (n3035), section D.9
是的，从今天起auto_ptr将在 C++0x 中被弃用，您应该使用它unique_ptr。来自最新的标准草案 (n3035)，第 D.9 节
The class template
auto_ptris deprecated. [ Note: The class templateunique_ptr(20.9.10) provides a better solution. —end note ]
auto_ptr不推荐使用类模板。[ 注意：类模板unique_ptr(20.9.10) 提供了更好的解决方案。——尾注]
Until the standard is ratified, it's always possible that the committee will revise this decision although I feel that is unlikely for this decision.
在标准被批准之前，委员会总是有可能修改这个决定，尽管我觉得这个决定不太可能。
回答by Maxime Lorant
Not only auto_ptris deprecated in C++11 (D.10, page 1228), it will also be deletedin a future version of C++:
不仅在 C++11 (D.10, page 1228) 中auto_ptr被弃用，它也将在 C++ 的未来版本中被删除：
Adopted N4190, and actually removed (not just deprecated) several archaic things from the C++ standard library, including
auto_ptr,bind1st/bind2nd,ptr_fun/mem_fun/mem_fun_ref,random_shuffle, and a few more. Those are now all removed from the draft C++17 standard library and will not be part of future portable C++.
采用N4190和实际删除（不只是不建议使用）几个古老的东西从C ++标准库，包括
auto_ptr，bind1st/bind2nd，ptr_fun/mem_fun/mem_fun_ref，random_shuffle和几个。这些现在都已从 C++17 标准库草案中删除，并且不会成为未来可移植 C++ 的一部分。
Another document about it: Programming Language C++, Library Evolution Working Group - Document N4190, if you want more information.
关于它的另一个文档：Programming Language C++, Library Evolution Working Group - Document N4190，如果您需要更多信息。
You can convert any code using auto_ptrautomaticaly, by using unique_ptrinstead:
您可以使用auto_ptr自动转换任何代码，unique_ptr而是使用：
Any code using
auto_ptrcan be mechanically converted to usingunique_ptr, withmove()inserted wheneverauto_ptrwas being "copied".
任何代码 using
auto_ptr都可以机械地转换为 usingunique_ptr，并在“复制”move()时插入auto_ptr。
回答by Maxime Lorant
No, it isn't deprecated. It may be, if C++0x ever gets accepted. And it will realistically always be supported. I don't believe that any deprecated feature has ever been dropped from real-world C++ implementations.
不，它没有被弃用。如果 C++0x 被接受，它可能是。它实际上将始终得到支持。我不相信现实世界的 C++ 实现中曾经删除过任何已弃用的功能。
