How can I dynamically allocate memories for 4-D array with 2-D fixed array in c++

Question

How can I dynamically allocate memories for 4-D array with 2-D fixed array in c++

I know the way of assigning 3-D array with 2-D fixed array in this way

int n = 100;
double (*a)[4][5];
a = new double[n][4][5];

but in the 4-D case, what should I do?

int n = 100;
int m = 1000;
double (*(*a))[4][5];
a = new double[m][][4][5] ???

It is possible to avoid this problem by using quadruple pointer (double**** a), but I need fixed matrix ([4][5]) in my code system. please help

Answer 1

代替使用指针和跟踪内存，您应该使用向量。

vector<vector<vector<vector<int>>>> vector4d(dim1, vector<vector<vector<int>>>(dim2, vector<vector<int>>(4, vector<int>(5, 0))))