testearr.cpp

/**
 * make testearr && ./testearr
 */

#include <iostream>
#include <array>

template <typename T, std::size_t I, std::size_t J>
using Matrix = std::array< std::array<T, J>, I>;

int main() {
    Matrix<int, 3, 2> m {
        1, 2,
        3, 4,
        5, 6
    };

    for (int i = 0; i < m.size(); ++i) {
        for (int j = 0; j < m[i].size(); ++j) {
            std::cout << m[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}