在 GNU C++ 中声明字符串数组
对我来说，这似乎应该如此简单，但我只是觉得我错过了一些东西。
我的头文件中有一个私有变量 _stoplist 当我在头文件中声明它时，代码看起来就像这样。
private:
std::string _stoplist[];
但是当我稍后在我的函数中决定访问它时，它会出现任何错误。
_stoplist[_length];
//cout << _length << prints 104 (its a valid int and everything)
_stoplist[0] = "b";
std::string.assign() 代码因段错误而崩溃。我有一种直觉，我在这里遗漏了一些明显的东西，但我还没有完全弄清楚是什么。
提前致谢！
编辑：好的，感谢您的所有帮助。对于任何可能阅读本文的人，我建议使用下面的答案之一，因为这是明智的方法。但就我而言，由于我需要在不使用向量的情况下动态分配它，所以我只使用了以下代码。
private:
std::string *_stoplist;
然后在我的 cpp 文件中
_stoplist = new string[_length];
是的，事实证明它确实很简单，我只是忽略了那部分。
To me it seems like it should be so simple, but I just feel like I'm missing something.
I have in my header file a private variable _stoplist When I declared it in the header file the code looks just like this.
private:
std::string _stoplist[];
But when later in my function I decide to access this, it segfaults on anything.
_stoplist[_length];
//cout << _length << prints 104 (its a valid int and everything)
_stoplist[0] = "b";
Crashes in the std::string.assign() code with a segfault. I have a gut feeling that I'm missing something obvious here but I haven't quite found out what yet.
Thanks in advance!
EDIT: Ok, thanks for all the help. For anyone else who may read this, I would recommend to use one of the answers below since that is the smart way to do it. In my case though since I needed to dynamically allocate it without using vector I just used the following code.
private:
std::string *_stoplist;
and then in my cpp file
_stoplist = new string[_length];
Yeah, turns out that it really was way simple, and I just was over looking that part.
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由于 _stoplist 没有大小，因此出现数组越界错误。您应该给它一个大小，并且只访问该范围内的元素，例如：
现在您应该能够通过 _stoplist[99] 索引 _stoplist[0]。然而，更好的解决方案可能会使用 std::vector 代替，因为它更安全。
然后，您可以使用其成员函数（例如 resize()）将其增长到您需要的任何大小。
You're getting an array out of bounds error because _stoplist doesn't have a size. You should either give it a size, and only access elements within that range, such as:
now you should be able to index _stoplist[0] through _stoplist[99]. However a better solution would probably to use std::vector instead, as it's a lot safer.
Then you can use its member functions such as resize() to grow it to whatever size you need.
这是因为声明为
std::string[]的变量基本上只是一个指针。要使用它，您需要为其分配内存。如果您想为其分配固定内存，请尝试将其声明为例如std::string _stoplist[5];。That's because a variable declared as
std::string[]is basically just a pointer. To use it, you need to allocate memory for it. If you want to allocate fixed memory for it, try declaring it as e.g.std::string _stoplist[5];instead.