array3d.cpp

#include <iostream>
#include <vector>

using namespace std;

template <typename T, size_t dim1, size_t dim2>
class array2dref
{
public:
    array2dref(T * data_) : data(data_) {}

    T * operator[](size_t y) const { return data + y * dim2; }

private:
    T * data;
};

template <typename T, size_t dim1, size_t dim2, size_t dim3>
class array3d
{
public:
    array3d() { data = new T[dim1 * dim2 * dim3]; }

    auto operator[](size_t y) const { return array2dref<T, dim2, dim3>(data + y * dim2 * dim3); }

    ~array3d() { delete[] data; }

private:
    T * data;
};

int main()
{
    vector<int> d;
    for (auto i = 0ul; i < 8; ++i)
    {
        d.push_back(i);
    }

    array3d<int, 2, 2, 2> a;

    for (auto i = 0ul; i < 2; ++i)
    {
        for (auto j = 0ul; j < 2; ++j)
        {
            for (auto k = 0ul; k < 2; ++k)
            {
                a[i][j][k] = d[i * 4 + j * 2 + k];
            }
        }
    }

    for (auto i = 0ul; i < 2; ++i)
    {
        for (auto j = 0ul; j < 2; ++j)
        {
            for (auto k = 0ul; k < 2; ++k)
            {
                std::cout << a[i][j][k] << std::endl;
            }
        }
    }

    return 0;
}