stl vector.push_back（）抽象类无法编译 [英] stl vector.push_back() abstract class doesn't compile

问题描述

假设我有一个包含类类型为 xx的stl向量。 xx是抽象的。我遇到了这样的问题，当我执行以下操作时，编译器将不允许我实例化：

Let's say I have an stl vector containing class type "xx". xx is abstract. I have run into the issue where the compiler won't let me "instantiate" when i do something like the following:

std::vector<xx> victor;
void pusher(xx& thing)
{
    victor.push_back(thing);
}

void main()
{
    ;
}

我认为这是因为必须调用复制构造函数。通过将xx *存储在向量中而不是xx，我解决了这个问题。有更好的解决方案吗？是什么？

I assume this is because the copy constructor must be called. I have gotten around this issue by storing xx*'s in the vector rather than xx's. Is there a better solution? What is it?

推荐答案

使用 push_back 时，您正在对象的副本并将其存储在向量中。如您所料，这无法正常工作，因为您无法实例化一个抽象类，而该类基本上就是复制构造所要做的。

When you use push_back, you are making a copy of the object and storing it in the vector. As you surmised, this doesn't work since you can't instantiate an abstract class, which is basically what the copy-construction is doing.

建议使用指针，或 boost 和 loki 。

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