#if !defined(_TYPE_TRAITS)
#define _TYPE_TRAITS

namespace std
{
    /// integral_constant
    template<typename _Tp, _Tp __v>
        struct integral_constant
        {
            static const _Tp                      value = __v;
            typedef _Tp                           value_type;
            typedef integral_constant<_Tp, __v>   type;
        };

    /// typedef for true_type
    typedef integral_constant<bool, true>     true_type;

    /// typedef for false_type
    typedef integral_constant<bool, false>    false_type;

    template<typename _Tp, _Tp __v>
        const _Tp integral_constant<_Tp, __v>::value;

    /// remove_const
    template<typename _Tp>
        struct remove_const
        { typedef _Tp     type; };

    /// remove_volatile
    template<typename _Tp>
        struct remove_volatile
        { typedef _Tp     type; };

    /// remove_cv
    template<typename _Tp>
        struct remove_cv
        {
            typedef typename
                remove_const<typename remove_volatile<_Tp>::type>::type     type;
        };

    template<typename> struct _is_integral_type : public false_type { };
    template<> struct _is_integral_type<bool>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<char>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<signed char>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<unsigned char>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<short>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<unsigned short>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<int>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<unsigned int>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<long>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<unsigned long>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<long long>: public integral_constant<bool,true> {};
    template<> struct _is_integral_type<unsigned long long>: public integral_constant<bool,true> {};

    /// is_integral
    template<typename _Tp>
        struct is_integral
        : public integral_constant<bool, (_is_integral_type<typename
                                          remove_cv<_Tp>::type>::value)>
    { };
  /// is_same
  template<typename, typename>
    struct is_same
    : public false_type { };

  template<typename _Tp>
    struct is_same<_Tp, _Tp>
    : public true_type { };

  template<typename>
    struct __is_pointer_helper
    : public false_type { };

  template<typename _Tp>
    struct __is_pointer_helper<_Tp*>
    : public true_type { };

  /// is_pointer
  template<typename _Tp>
    struct is_pointer
    : public integral_constant<bool, (__is_pointer_helper<typename
                      remove_cv<_Tp>::type>::value)>
    { };
}
#endif