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移动 std::deque 后是否保证引用/指针有效？

[英]Are references / pointers guaranteed to be valid after moving std::deque?

原文 2021-11-11 12:33:54 7 1 c++/ c++11/ stl/ deque

Is it safe to assume that any pointers I have to elements inside of an std::deque are still valid after moving the deque to another one with the move constructor?假设在使用移动构造函数将双端队列移动到另一个双端队列后，指向std::deque内部元素的任何指针仍然有效是否安全？

For std::vector I cannot see any reason why they wouldn't be, but I'm not familiar enough with std::deque to be sure I can make the same assumption.对于std::vector我看不出它们为什么不会的任何原因，但我对std::deque不够熟悉，无法确定我可以做出相同的假设。

1 个解决方案

Pointers to elements would remain valid.指向元素的指针将保持有效。 After move construction : 搬家施工后：

After container move construction (overload (8)), references, pointers, and iterators (other than the end iterator) to other remain valid, but refer to elements that are now in *this .在容器移动构造（重载 (8)）之后，指向 other 的引用、指针和迭代器（结束迭代器除外）仍然有效，但引用现在在*this元素。 The current standard makes this guarantee via the blanket statement in [container.requirements.general]/12 , and a more direct guarantee is under consideration via LWG 2321 .当前标准通过[container.requirements.general]/12 中的一揽子声明做出此保证，并且正在考虑通过LWG 2321提供更直接的保证。

我保证在向量移动后指向std :: vector元素的指针是有效的吗？ - Am I guaranteed that pointers to std::vector elements are valid after the vector is moved?

C ++参考是否保证“内部”使用指针？ - Are C++ references guaranteed to use pointers “internally”?

C ++派生对象数据在基础对象std :: swap后保证有效吗？ - C++ Is derived object data guaranteed valid after a base object std::swap?

当迭代器在双端队列中无效时，引用如何有效 - How can references be valid while iterators become invalidated in a deque

在 C++ 中，循环中 std::deque 上的 pop_front() 是否有效？ - In C++ is it valid to pop_front() on a std::deque in a loop?

std :: map，引用，指针和内存分配 - std::map, references, pointers and memory allocation

如何在 std::set 中存储指向对象的指针（或引用） - How to store pointers (or references) to objects in a std::set

初始化向量指针的双端队列 - initialise a deque of vector pointers

正确删除指针的双端队列 - Properly deleting a Deque of Pointers

自定义比较器，用于双端队列中的指针 - custom comparator for pointers in a deque

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