Multi-dimensional vector

Question

How can I create a 2D vector? I know that in 2D array, I can express it like:

a[0][1]=98;
a[0][2]=95;
a[0][3]=99;
a[0][4]=910;

a[1][0]=98;
a[1][1]=989;
a[1]         


        

Answer 1

dribeas' suggestion is really the way to go.

Just to give a reason why you might want to go the operator() route, consider that for instance if your data is sparse you can lay it out differently to save space internally and operator() hides that internal implementation issue from your end user giving you better encapsulation and allowing you to make space or speed improving changes to the internal layout later on without breaking your interface.