#include <array>

template <typename T, size_t D>
class default_name
{
  std::array<Type, Dim> container;
  ...
}

#include <array>

template <typename T, size_t D>
class default_name{
    typedef std::array<T, D> Container;
    Container container;
public:
    typedef typename Container::iterator Iterator;
    typedef typename Container::const_iterator ConstIterator;

    Iterator begin(){
        return container.begin();
    }
    Iterator end(){
        return container.begin();
    }

    ConstIterator begin() const{
        return container.begin();
    }
    ConstIterator end() const{
        return container.begin();
    }
};