迭代器为2d矢量 [英] iterator for 2d vector

问题描述

如何为2d向量（向量向量）创建迭代器？

How to create iterator/s for 2d vector (a vector of vectors)?

推荐答案

>不是非常清楚，我假设你的意思是一个2D向量是一个向量的向量：

Although your question is not very clear, I'm going to assume you mean a 2D vector to mean a vector of vectors:

vector< vector<int> > vvi;

然后你需要使用两个迭代器来遍历它，第一个是rows的迭代器，第二个是row中的列的迭代器：

Then you need to use two iterators to traverse it, the first the iterator of the "rows", the second the iterators of the "columns" in that "row":

//assuming you have a "2D" vector vvi (vector of vector of int's)
vector< vector<int> >::iterator row;
vector<int>::iterator col;
for (row = vvi.begin(); row != vvi.end(); row++) {
    for (col = row->begin(); col != row->end(); col++) {
        // do stuff ...
    }
}

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