声明未知维的二维数组的最佳方法是什么？

Question

I need to declare and store a bidimensional array of strings. I have no way of knowing the size of both dimensions beforehand. C++ requires me to know the size of at least the second array, correct? If so, what's the best way to go about this?

Answer 1

Use std::vector . In fact you should already be doing this even if you know the size, unless you have very good reasons not to.

Answer 2

As other answers stated, std::vector<> is the appropriate collection for the job.

To declare a 2D vector of strings, use:

std::vector<std::vector<std::string>> strings;

Once populated, you can use the familiar subscript notation to access elements:

const std::string& at(strings[i][j]);

Answer 3

Don't use 'raw' arrays, since you don't know the size. One possibility would be to use the standard container std::vector .