Boost.Pointer容器在C ++ 11/14中被std :: unique_ptr淘汰了吗? [英] Boost.Pointer Container made obsolete by std::unique_ptr in C++11/14?

问题描述

std::unique_ptr使 Boost.Pointer Container 库在C ++ 11/14中过时吗?

Does std::unique_ptr make Boost.Pointer Container library obsolete in C++11/14?

在C ++ 98/03中没有移动语义，并且像shared_ptr这样的智能指针具有与引用计数相关的 overhead (两者均用于ref计数块，而>互锁增量/减量).因此，与std::vector<T*>相比，类似std::vector<shared_ptr<T>>的开销很大.

In C++98/03 there isn't move semantics, and a smart pointer like shared_ptr has reference-counting related overhead (both for the ref counting block, and the interlocked increment/decrements) if compared to raw pointers. So something like std::vector<shared_ptr<T>> has overhead if compared to std::vector<T*>.

但是std::vector<std::unqiue_ptr<T>>与std::vector<T*>(无引用计数开销)一样有效，另外和在安全方面异常和自动销毁(即vector<unique_ptr<T>>析构函数将自动调用其指针存储在vector中的T项的析构函数)?

But is std::vector<std::unqiue_ptr<T>> just as efficient as std::vector<T*> (no reference counting overhead), and in addition safe in regard to exceptions and automatic destruction (i.e. vector<unique_ptr<T>> destructor will automatically call the destructors for the T items whose pointers are stored in the vector)?

如果是这样，Boost.Pointer容器在C ++ 11/14代码中是否仍然有用，还是只是过时了?

If so, does Boost.Pointer Container still have a valid useful place in C++11/14 code, or is it just obsolete?

推荐答案

就像James在他的回答中提到的那样，与将unique_ptr粘贴到标准库中所得到的容器相比，Boost.Pointer容器提供了更直观的界面.容器.

As James mentions in his answer, the Boost.Pointer containers offer a more intuitive interface as compared to what you get by sticking a unique_ptr into a standard library container.

除此之外，boost::ptr_vector<T>(和朋友)在下面将指向的类型存储为void *，因此您不会获得每个T的完整类模板实例化. vector<unique_ptr<T>>并非如此.

Aside from that, boost::ptr_vector<T> (and friends) store the pointed to type as a void * underneath, so you don't get an entire class template instantiation for every T. This is not the case with vector<unique_ptr<T>>.

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