How to initialize a vector of vector of strings using for loop in C++?

Question

I have problem with initializing the following vector:

int main()
{
    ...
    int size = classData.size();
    vector<vector<string>> arrayClass[size][3];     // <-- problem
    for(int i = 0 ; i < classData.size(); i++)
    {
        for(int j = 0 ; j < 3; j++)
        {
            arrayClass[i][j] = classData[j+i];
        }
    }
}

It says that size must be constant value. Any thoughts?

You have a 2D array of 2D vectors of strings, which are like a vector. 5 dimensions is not going to go well when trying to use it. — Qaz
– Qaz, Commented Nov 11, 2013 at 17:57

LihO · Accepted Answer · 2013-11-11 17:57:47Z

8

vector<vector<string>> arrayClass[size][3];

was meant to be:

vector<vector<string>> arrayClass(size, vector<string>(3));

which takes advantage od std::vector's constructor, which initializes the vector with appropriate size, filling it with empty strings.

answered Nov 11, 2013 at 17:57

LihO

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