为什么不重载operator + =（）为std :: vector？ [英] Why not overload operator+=() for std::vector?

问题描述

我已经开始学习C ++，所以我不知道在我缺乏知识/经验，为什么一些看起来很简单的新手，因为我要描述的东西还没有在STL中。要将向量添加到另一个向量，您必须键入：

I've started learning C++, so I don't know in my lack of knowledge/experience why something so seemingly simple to a rookie as what I'm about to describe isn't already in the STL. To add a vector to another vector you have to type this:

v1.insert(v1.end(), v2.begin(), v2.end());

我想知道在现实世界中，人们只是重载+ =运算符， ，例如对于

I'm wondering whether in the real world people just overload the += operator to make this less verbose, for example to the effect of

template <typename T>
void operator+=(std::vector<T> &v1, const std::vector<T> &v2) {
    v1.insert(v1.end(), v2.begin(), v2.end());
}

那么你可以

v1 += v2;

我也有这个设置为push_back到+ =单个元素到结尾。有什么理由这些事情不应该做，或者精通C ++的人特别避免？

I also have this set up for push_back to "+=" a single element to the end. Is there some reason these things should not be done or are specifically avoided by people who are proficient in C++?

推荐答案

我想以 append（）的重载的形式看到这个功能的情况。 operator + = 是有点模糊，你是否意味着将每个向量的元素相加？

This is actually a case where I would like to see this functionality in the form of an overload of append(). operator+= is kinda ambiguous, do you mean to add the elements of each vector to each other? Or you mean to append?

但是，就像我说的，我会欢迎： v1.append（v2）; 这很清楚和简单，我不知道为什么它不在那里。

However, like I said, I would have welcomed: v1.append(v2); It is clear and simple, I don't know why it isn't there.

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