how to create a contiguous 2d array in c++?

Question

I want to create a function that returns a contiguous 2D array in C++.

It is not a problem to create the array using the command:

 int (*v)[cols] = n         


        

Answer 1

I think you should write a simple class to wrap a 1-dim array. Then you can implement a 2-dim array with operator() overloading for getting values and deconstruct func for release the memory. Code as below:

#include 

template 
class Array_2D
{
private:
    T *data_inside;
public:
    int size[2];
    Array_2D(int row, int column);
    ~Array_2D();

    // 
    T operator()(int index1, int index2){
        return data_inside[get_index(index1, index2)];
    }

    int get_index(int index1, int index2){
        if(index1>=0 and index1=0 and index2<=size[1]){
            return index1*size[0] + index2;
        }else{
            assert("wrong index for array!" == "True");
        }
    }

};

template 
Array_2D::Array_2D(int row, int column)
{
    size[0] = row;
    size[1] = column;
    data_inside = new T[row*column];
}

template 
Array_2D::~Array_2D()
{
    // 使用析构函数，自动释放资源
    delete[] data_inside;
}