如何声明2d std::array

#include <array>

int main() {
    const int rows = 3;
    const int cols = 4;

    std::array<std::array<int, cols>, rows> myArray;

    // 对数组进行初始化
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            myArray[i][j] = i * cols + j;
        }
    }

    // 访问数组元素
    for (int i = 0; i < rows; ++i) {
        for (int j = 0; j < cols; ++j) {
            std::cout << myArray[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}