VC++ dereference SFINAE, C++ (vc++)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86

#include <iostream>
#include <type_traits>

// https://stackoverflow.com/questions/9851594
template < typename T >
struct remove_all_pointers
{
  typedef T type;
};

template < typename T >
struct remove_all_pointers < T* >
{
  typedef typename remove_all_pointers<T>::type type;
};

template < typename T >
typename std::enable_if<
  std::is_same< T, typename remove_all_pointers<T>::type >::value,
  typename remove_all_pointers<T>::type&
  >::type
dereference(T& a)
{
  return a;
}

template < typename T >
typename std::enable_if<
  !std::is_same< T, typename remove_all_pointers<T>::type >::value,
  typename remove_all_pointers<T>::type&
  >::type
dereference(T& a)
{
  return dereference(*a);
}

template<class T>
class array1
{
private:
    T a;
public:
    array1(T b){
        a = b;
    }
    friend std::ostream& operator<<(std::ostream& out,array1 b){
        out << dereference(b.a);
        return out;
    }
};

int main()
{
    int* b = new int[2];
    b[0] = 5;
    b[1] = 10;
    array1<int*> num(b);
    std::cout << num << '\n';
}

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Compilation time: 2,12 sec, absolute running time: 0,43 sec, absolute service time: 2,57 sec