How Can I Statically Declare a 2D Array as a Class Data Member in C ?

Statically Declaring a 2-D Array as a Class Data Member

Your goal is to create a grid class with data members NR, NC, and a 2D array Coordinates[NR][NC]. You want to initialize NR and NC through the class constructor and avoid dynamic memory allocation to optimize memory usage and minimize cache misses.

To achieve this, consider using std::vector, which provides contiguous memory allocation. Here's a modified version of your code snippet:

class grid {
public:
    vector<double> coordinates;
    unsigned NR, NC;

    grid(unsigned NR, unsigned NC) : NR(NR), NC(NC), coordinates(NR * NC) {}

    double& operator()(unsigned r, unsigned c) { return coordinates[r * NC + c]; }
};

int main() {
    grid g(2, 3);
    g(0, 0) = 1;
    g(1, 2) = 6;
}

This class defines a 2D array using a contiguous vector. The operator() method provides a convenient way to access elements using row and column indices.

This approach avoids dynamic allocation, provides contiguous memory allocation, and ensures efficient memory usage.

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