How to pass 2-D vector to a function in C++?

Question

If it is passed, is it passed by value or by reference?

void printMatrix(vector> *matrix);

...

vector> matr         


        

Answer 1

Well, first of all, you're creating it wrong.

vector> matrix1(3, vector(3,0));

You can pass by value or by reference, or by pointer(not recommended). If you're passing to a function that doesn't change the contents, you can either pass by value, or by const reference. I would prefer const reference, some people think the "correct" way is to pass by value.

void printMatrix(const vector> & matrix);

// or
void printMatrix(vector> matrix);

// to call
printMatrix(matrix1);