--- /dev/null
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file ext/type_traits.h
+ * This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _EXT_TYPE_TRAITS
+#define _EXT_TYPE_TRAITS 1
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+#include <bits/cpp_type_traits.h>
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ // Define a nested type if some predicate holds.
+ template<bool, typename>
+ struct __enable_if
+ { };
+
+ template<typename _Tp>
+ struct __enable_if<true, _Tp>
+ { typedef _Tp __type; };
+
+
+ // Conditional expression for types. If true, first, if false, second.
+ 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; };
+
+
+ // Given an integral builtin type, return the corresponding unsigned 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; };
+
+ // Declare but don't define.
+ template<>
+ struct __add_unsigned<bool>;
+
+ template<>
+ struct __add_unsigned<wchar_t>;
+
+
+ // Given an integral builtin type, return the corresponding signed type.
+ 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; };
+
+ // Declare but don't define.
+ template<>
+ struct __remove_unsigned<bool>;
+
+ template<>
+ struct __remove_unsigned<wchar_t>;
+
+
+ // For use in string and vstring.
+ template<typename _Type>
+ inline bool
+ __is_null_pointer(_Type* __ptr)
+ { return __ptr == 0; }
+
+ template<typename _Type>
+ inline bool
+ __is_null_pointer(_Type)
+ { return false; }
+
+
+ // For complex and cmath
+ template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
+ struct __promote
+ { typedef double __type; };
+
+ // No nested __type member for non-integer non-floating point types,
+ // allows this type to be used for SFINAE to constrain overloads in
+ // <cmath> and <complex> to only the intended types.
+ template<typename _Tp>
+ struct __promote<_Tp, false>
+ { };
+
+ template<>
+ struct __promote<long double>
+ { typedef long double __type; };
+
+ template<>
+ struct __promote<double>
+ { typedef double __type; };
+
+ template<>
+ struct __promote<float>
+ { typedef float __type; };
+
+ template<typename _Tp, typename _Up,
+ typename _Tp2 = typename __promote<_Tp>::__type,
+ typename _Up2 = typename __promote<_Up>::__type>
+ struct __promote_2
+ {
+ typedef __typeof__(_Tp2() + _Up2()) __type;
+ };
+
+ template<typename _Tp, typename _Up, typename _Vp,
+ typename _Tp2 = typename __promote<_Tp>::__type,
+ typename _Up2 = typename __promote<_Up>::__type,
+ typename _Vp2 = typename __promote<_Vp>::__type>
+ struct __promote_3
+ {
+ typedef __typeof__(_Tp2() + _Up2() + _Vp2()) __type;
+ };
+
+ template<typename _Tp, typename _Up, typename _Vp, typename _Wp,
+ typename _Tp2 = typename __promote<_Tp>::__type,
+ typename _Up2 = typename __promote<_Up>::__type,
+ typename _Vp2 = typename __promote<_Vp>::__type,
+ typename _Wp2 = typename __promote<_Wp>::__type>
+ struct __promote_4
+ {
+ typedef __typeof__(_Tp2() + _Up2() + _Vp2() + _Wp2()) __type;
+ };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif
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