二维向量初始化 [英] 2d Vector Initialization

问题描述

我放弃了将二维数组传递给函数的尝试，因为在编译时维度未知.经过一些研究，似乎二维向量可能是一个很好的替代品.我只想确认这是声明维度 totalRows X totalColumns 的二维向量的正确方法，初始化每个单元格以包含空格字符:

I gave up on trying to pass a 2d array to a function, where the dimensions are not known at compile time. After some research, it seems like a 2d vector may be a good substitute. I just want to confirm that this is the correct way to declare a 2d vector of dimension totalRows X totalColumns, initializaing each cell to contain the space character:

vector<vector<char> > world(totalRows, vector<char>(totalColumns, ' '));

推荐答案

您的代码有效.正如评论中所注意到的，vector> 并不是真正的二维数组.

Your code works. As noticed in the comment, vector<vector<T>> is not truly a 2D array.

这里重要的是 (totalRows, vector(totalColumns, ' ')) 和 (totalColumns, vector(totalRows, ' '))code> 是等效的，只要您始终遵循用于创建向量的规则:line x column (或 column x line)

The important thing here is that (totalRows, vector<char>(totalColumns, ' ')) and (totalColumns, vector<char>(totalRows, ' ')) are equivalent, as long as you always follow the rule used to create the vector: line x column (or column x line)

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