How Can I Achieve Contiguous Memory Allocation for a Statically Declared 2-D Array as a Class Member?

Statically Declared 2-D Array as a Class Data Member: Achieving Contiguous Memory Allocation

To avoid dynamic memory allocation and ensure contiguous memory allotment, you can employ an alternative approach to declaring 2-D arrays as class members.

Instead of using a traditional 2-D array, you can create a class that simulates the behavior of an array by utilizing a vector as the underlying data structure. This technique offers several advantages:

Firstly, a vector stores its elements contiguously in memory, eliminating the risk of cache misses. Secondly, you gain the flexibility to customize the class as per your specific requirements.

To demonstrate this approach, consider the following code:

class Array2D {
public:
    vector<int> v;
    int nc;
    Array2D(int NR, int NC) : v(NR*NC), nc(NC) {}
    int* operator[](int r) { return &v[r*nc]; }
};

Here, the class Array2D contains a vector v and an integer variable nc representing the number of columns. Using the constructor, you can initialize the size of the 2-D array (NR, NC).

To access the elements of the array, the operator[] is overloaded. When you call array2d[0][0], it returns a pointer to the first element of the first row.

In the main function:

Array2D array2d(2, 3);
array2d[0][0] = 1;
array2d[1][2] = 6;

This code assigns the value 1 to the first element and 6 to the last element of the array2d.

This implementation provides a statically declared 2-D array as a data member of the class, ensuring contiguous memory storage. It offers greater control over memory allocation and avoids potential cache misses, making it an efficient choice for performance-sensitive applications.

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