How to define a 2D array in C++ and STL without memory manipulation?

Question

There are several ways to define a 2D array in C++ and STL without memory manipulation, and the following codes illustrate two different methods:

int main () 
{
         


        

Answer 1

In C++11 use std::array:

  std::array,2> a {{
    {{1,2,3}},
    {{4,5,6}}
 }};

Some usage:

  a[0][2] = 13;