type_traits.h

/***************************************************************************
 * include/stxxl/bits/compat/type_traits.h
 *
 * Part of the STXXL. See http://stxxl.sourceforge.net
 *
 * Copyright (C) 2009-2011 Andreas Beckmann <[email protected]>
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE_1_0.txt or copy at
 * http://www.boost.org/LICENSE_1_0.txt)
 **************************************************************************/

#ifndef STXXL_HEADER__COMPAT_TYPE_TRAITS_H_
#define STXXL_HEADER__COMPAT_TYPE_TRAITS_H_

#if defined(__GXX_EXPERIMENTAL_CXX0X__)
#include <type_traits>
#elif defined(__GNUG__) && (__GNUC__ >= 4)
#include <tr1/type_traits>
#elif defined(STXXL_BOOST_CONFIG)
#include <boost/type_traits/remove_const.hpp>
#endif

#include <stxxl/bits/namespace.h>


__STXXL_BEGIN_NAMESPACE

namespace compat
{
#if defined(__GXX_EXPERIMENTAL_CXX0X__)
 using std::remove_const;
#elif defined(__GNUG__) && (__GNUC__ >= 4)
 using std::tr1::remove_const;
#elif defined(STXXL_BOOST_CONFIG)
 using boost::remove_const;
#else
 template <typename _Tp>
 struct remove_const
 {
 typedef _Tp type;
 };

 template <typename _Tp>
 struct remove_const<_Tp const>
 {
 typedef _Tp type;
 };
#endif

#if defined(__GNUG__) && ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100) < 40300)
// That is a small subset of what GCC 4.3 does:

// Utility for finding the signed versions of unsigned integral types.
 template <typename _Tp>
 struct __make_signed
 {
 typedef _Tp __type;
 };

 template <>
 struct __make_signed<char>
 {
 typedef signed char __type;
 };

 template <>
 struct __make_signed<unsigned char>
 {
 typedef signed char __type;
 };

 template <>
 struct __make_signed<unsigned short>
 {
 typedef signed short __type;
 };

 template <>
 struct __make_signed<unsigned int>
 {
 typedef signed int __type;
 };

 template <>
 struct __make_signed<unsigned long>
 {
 typedef signed long __type;
 };

 template <>
 struct __make_signed<unsigned long long>
 {
 typedef signed long long __type;
 };


 template <typename _Tp>
 struct make_signed
 {
 typedef typename __make_signed<_Tp>::__type type;
 };
#endif
} // namespace compat

__STXXL_END_NAMESPACE

#endif // !STXXL_HEADER__COMPAT_TYPE_TRAITS_H_