--- /dev/null
+// The -*- C++ -*- type traits classes for internal use in libstdc++
+
+// Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
+// 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 bits/cpp_type_traits.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{ext/type_traits}
+ */
+
+// Written by Gabriel Dos Reis <dosreis@cmla.ens-cachan.fr>
+
+#ifndef _CPP_TYPE_TRAITS_H
+#define _CPP_TYPE_TRAITS_H 1
+
+#pragma GCC system_header
+
+#include <bits/c++config.h>
+
+//
+// This file provides some compile-time information about various types.
+// These representations were designed, on purpose, to be constant-expressions
+// and not types as found in <bits/type_traits.h>. In particular, they
+// can be used in control structures and the optimizer hopefully will do
+// the obvious thing.
+//
+// Why integral expressions, and not functions nor types?
+// Firstly, these compile-time entities are used as template-arguments
+// so function return values won't work: We need compile-time entities.
+// We're left with types and constant integral expressions.
+// Secondly, from the point of view of ease of use, type-based compile-time
+// information is -not- *that* convenient. On has to write lots of
+// overloaded functions and to hope that the compiler will select the right
+// one. As a net effect, the overall structure isn't very clear at first
+// glance.
+// Thirdly, partial ordering and overload resolution (of function templates)
+// is highly costly in terms of compiler-resource. It is a Good Thing to
+// keep these resource consumption as least as possible.
+//
+// See valarray_array.h for a case use.
+//
+// -- Gaby (dosreis@cmla.ens-cachan.fr) 2000-03-06.
+//
+// Update 2005: types are also provided and <bits/type_traits.h> has been
+// removed.
+//
+
+// Forward declaration hack, should really include this from somewhere.
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ template<typename _Iterator, typename _Container>
+ class __normal_iterator;
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ struct __true_type { };
+ struct __false_type { };
+
+ template<bool>
+ struct __truth_type
+ { typedef __false_type __type; };
+
+ template<>
+ struct __truth_type<true>
+ { typedef __true_type __type; };
+
+ // N.B. The conversions to bool are needed due to the issue
+ // explained in c++/19404.
+ template<class _Sp, class _Tp>
+ struct __traitor
+ {
+ enum { __value = bool(_Sp::__value) || bool(_Tp::__value) };
+ typedef typename __truth_type<__value>::__type __type;
+ };
+
+ // Compare for equality of types.
+ template<typename, typename>
+ struct __are_same
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ template<typename _Tp>
+ struct __are_same<_Tp, _Tp>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ // Holds if the template-argument is a void type.
+ template<typename _Tp>
+ struct __is_void
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ template<>
+ struct __is_void<void>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ //
+ // Integer types
+ //
+ template<typename _Tp>
+ struct __is_integer
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ // Thirteen specializations (yes there are eleven standard integer
+ // types; <em>long long</em> and <em>unsigned long long</em> are
+ // supported as extensions)
+ template<>
+ struct __is_integer<bool>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<char>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<signed char>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<unsigned char>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+# ifdef _GLIBCXX_USE_WCHAR_T
+ template<>
+ struct __is_integer<wchar_t>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+# endif
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<>
+ struct __is_integer<char16_t>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<char32_t>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+#endif
+
+ template<>
+ struct __is_integer<short>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<unsigned short>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<int>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<unsigned int>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<long>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<unsigned long>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<long long>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_integer<unsigned long long>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ //
+ // Floating point types
+ //
+ template<typename _Tp>
+ struct __is_floating
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ // three specializations (float, double and 'long double')
+ template<>
+ struct __is_floating<float>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_floating<double>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_floating<long double>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ //
+ // Pointer types
+ //
+ template<typename _Tp>
+ struct __is_pointer
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ template<typename _Tp>
+ struct __is_pointer<_Tp*>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ //
+ // Normal iterator type
+ //
+ template<typename _Tp>
+ struct __is_normal_iterator
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ template<typename _Iterator, typename _Container>
+ struct __is_normal_iterator< __gnu_cxx::__normal_iterator<_Iterator,
+ _Container> >
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ //
+ // An arithmetic type is an integer type or a floating point type
+ //
+ template<typename _Tp>
+ struct __is_arithmetic
+ : public __traitor<__is_integer<_Tp>, __is_floating<_Tp> >
+ { };
+
+ //
+ // A fundamental type is `void' or and arithmetic type
+ //
+ template<typename _Tp>
+ struct __is_fundamental
+ : public __traitor<__is_void<_Tp>, __is_arithmetic<_Tp> >
+ { };
+
+ //
+ // A scalar type is an arithmetic type or a pointer type
+ //
+ template<typename _Tp>
+ struct __is_scalar
+ : public __traitor<__is_arithmetic<_Tp>, __is_pointer<_Tp> >
+ { };
+
+ //
+ // For use in std::copy and std::find overloads for streambuf iterators.
+ //
+ template<typename _Tp>
+ struct __is_char
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ template<>
+ struct __is_char<char>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ template<>
+ struct __is_char<wchar_t>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+#endif
+
+ template<typename _Tp>
+ struct __is_byte
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+ template<>
+ struct __is_byte<char>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_byte<signed char>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ template<>
+ struct __is_byte<unsigned char>
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+
+ //
+ // Move iterator type
+ //
+ template<typename _Tp>
+ struct __is_move_iterator
+ {
+ enum { __value = 0 };
+ typedef __false_type __type;
+ };
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename _Iterator>
+ class move_iterator;
+
+ template<typename _Iterator>
+ struct __is_move_iterator< move_iterator<_Iterator> >
+ {
+ enum { __value = 1 };
+ typedef __true_type __type;
+ };
+#endif
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif //_CPP_TYPE_TRAITS_H
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