File: make_unique.hpp

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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;
}