Arbitrary dimensional array using Variadic templates

Question

How can I create an Array class in C++11 which can be used like

Array < int, 2, 3, 4> a, b; 
Array < char, 3, 4> d; 
Array < short, 2> e;
         


        

Answer 1

The simplest way to do this is by nesting std::array:

#include

template
struct ArrayImpl {
    using type = std::array::type, size>;
};

template
struct ArrayImpl {
    using type = std::array;
};

template
using Array = typename ArrayImpl::type;

In this solution Array is the same as std::array, 3> - array consisting of arrays of smaller dimension.

This also shows how you can implement operator[] for many dimensions. operator[] of your object needs to return object for which operator[] is also defined. In this case it is reference to an array of smaller dimension.