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If it is passed, is it passed by value or by reference?
void printMatrix(vector<vector<int>> *matrix);
...
vector<vector<int>> matrix(3, vector<int>(3,0));
printMatrix(&matrix1);
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A 2D vector can be passed to the function in the same way as 1D vector, using both: Pass By Value. Pass By Reference.
When we pass an array to a function, a pointer is actually passed. However, to pass a vector there are two ways to do so: Pass By value. Pass By Reference.
Initializing 2D vectors in C++Each value inside the first set of braces, like '{1, 0, 1}' and '{0, 1}' are vectors independently. Note: To create 2D vectors in C++ of different data-type, we can place the data-type inside the innermost angle brackets like <char> .
Since your function declaration:
void printMatrix(vector< vector<int> > *matrix)
specifies a pointer, it is essentially passed by reference. However, in C++, it's better to avoid pointers and pass a reference directly:
void printMatrix(vector< vector<int> > &matrix)
and
printMatrix(matrix1); // Function call
This looks like a normal function call, but it is passed by reference as indicated in the function declaration. This saves you from unnecessary pointer dereferences.
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