helper.h

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#include <cstddef>
#include <memory>
#include <type_traits>
#include <utility>

namespace std {
  template<class T> struct _Unique_if {
    typedef unique_ptr<T> _Single_object;
  };

  template<class T> struct _Unique_if<T[]> {
    typedef unique_ptr<T[]> _Unknown_bound;
  };

  template<class T, size_t N> struct _Unique_if<T[N]> {
    typedef void _Known_bound;
  };

  template<class T, class... Args>
    typename _Unique_if<T>::_Single_object
    make_unique(Args&&... args) {
    return unique_ptr<T>(new T(std::forward<Args>(args)...));
  }

  template<class T>
    typename _Unique_if<T>::_Unknown_bound
    make_unique(size_t n) {
    typedef typename remove_extent<T>::type U;
    return unique_ptr<T>(new U[n]());
  }

  template<class T, class... Args>
    typename _Unique_if<T>::_Known_bound
    make_unique(Args&&...) = delete;
}