STL容器和不可复制（和不可移动）对象 [英] STL containers and non copyable (and non movable) objects

问题描述

由于STL容器要求所有内容都是可复制和可分配的，在使用非可复制对象时，最好的习惯是什么？

Since STL containers require that all contents be copyable and assignable, what is the prefered idiom when working with non copyable objects?

我可以想出两种不同的方法：

I can think of two different approaches:

1. 智能）指针而不是STL容器中的对象。

1. Store (smart) pointers rather than the objects in STL containers.

删除STL容器并实现我自己的列表（例如每个对象必须包含一个指向下一个目的）。

Get rid of STL containers and implement my own lists (e.g. each object must include a pointer to the next object).

第二种方法的主要缺点是析构函数的实现（如果next对象在当前对象之前被销毁）

Main drawback of the second approach is implementation of destructors (should the "next" object be destroyed before the current one in a recursive way?)

推荐答案

我会选择方法＃1：ie store smart pointers

I'd choose approach #1: i.e. store smart pointers to objects in STL containers.

请注意，在STL容器中存储非拥有的原始指针（例如观察原始指针）是很好的，但是存储拥有原始指针是一个泄漏：使用 shared_ptr + 11的 unique_ptr 。

Note that it's fine to store non-owning raw pointers in STL containers (e.g. observing raw pointers), but storing owning raw pointers is a "leaktrocity": use shared_ptr or new C++11's unique_ptr instead.

划痕需要大量的时间和精力，我相信你不能在合理的时间框架内匹配丰富的商业质量的STL库。

As for #2, writing your own containers from scratch requires lots of time and energy, and I believe you can't match the richness of a full commercial-quality STL library implementation in a reasonable time-frame.

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