#ifndef _EXT_TYPE_TRAITS
#define _EXT_TYPE_TRAITS 1
#pragma GCC system_header
#include <cstddef>
#include <utility>
#include <bits/cpp_type_traits.h>
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
template<bool, typename>
struct __enable_if
{ };
template<typename _Tp>
struct __enable_if<true, _Tp>
{ typedef _Tp __type; };
template<bool _Cond, typename _Iftrue, typename _Iffalse>
struct __conditional_type
{ typedef _Iftrue __type; };
template<typename _Iftrue, typename _Iffalse>
struct __conditional_type<false, _Iftrue, _Iffalse>
{ typedef _Iffalse __type; };
template<typename _Tp>
struct __add_unsigned
{
private:
typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
public:
typedef typename __if_type::__type __type;
};
template<>
struct __add_unsigned<char>
{ typedef unsigned char __type; };
template<>
struct __add_unsigned<signed char>
{ typedef unsigned char __type; };
template<>
struct __add_unsigned<short>
{ typedef unsigned short __type; };
template<>
struct __add_unsigned<int>
{ typedef unsigned int __type; };
template<>
struct __add_unsigned<long>
{ typedef unsigned long __type; };
template<>
struct __add_unsigned<long long>
{ typedef unsigned long long __type; };
template<>
struct __add_unsigned<bool>;
template<>
struct __add_unsigned<wchar_t>;
template<typename _Tp>
struct __remove_unsigned
{
private:
typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
public:
typedef typename __if_type::__type __type;
};
template<>
struct __remove_unsigned<char>
{ typedef signed char __type; };
template<>
struct __remove_unsigned<unsigned char>
{ typedef signed char __type; };
template<>
struct __remove_unsigned<unsigned short>
{ typedef short __type; };
template<>
struct __remove_unsigned<unsigned int>
{ typedef int __type; };
template<>
struct __remove_unsigned<unsigned long>
{ typedef long __type; };
template<>
struct __remove_unsigned<unsigned long long>
{ typedef long long __type; };
template<>
struct __remove_unsigned<bool>;
template<>
struct __remove_unsigned<wchar_t>;
_GLIBCXX_END_NAMESPACE
#endif