--- /dev/null
+// C++0x type_traits -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 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 include/type_traits
+ * This is a Standard C++ Library header.
+ */
+
+#ifndef _GLIBCXX_TYPE_TRAITS
+#define _GLIBCXX_TYPE_TRAITS 1
+
+#pragma GCC system_header
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+# include <c++0x_warning.h>
+#else
+
+#if defined(_GLIBCXX_INCLUDE_AS_TR1)
+# error C++0x header cannot be included from TR1 header
+#endif
+
+#include <cstddef>
+
+#if defined(_GLIBCXX_INCLUDE_AS_CXX0X)
+# include <tr1_impl/type_traits>
+#else
+# define _GLIBCXX_INCLUDE_AS_CXX0X
+# define _GLIBCXX_BEGIN_NAMESPACE_TR1
+# define _GLIBCXX_END_NAMESPACE_TR1
+# define _GLIBCXX_TR1
+# include <tr1_impl/type_traits>
+# undef _GLIBCXX_TR1
+# undef _GLIBCXX_END_NAMESPACE_TR1
+# undef _GLIBCXX_BEGIN_NAMESPACE_TR1
+# undef _GLIBCXX_INCLUDE_AS_CXX0X
+#endif
+
+namespace std
+{
+ /** @addtogroup metaprogramming
+ * @{
+ */
+
+ // Primary classification traits.
+
+ /// is_lvalue_reference
+ template<typename>
+ struct is_lvalue_reference
+ : public false_type { };
+
+ template<typename _Tp>
+ struct is_lvalue_reference<_Tp&>
+ : public true_type { };
+
+ /// is_rvalue_reference
+ template<typename>
+ struct is_rvalue_reference
+ : public false_type { };
+
+ template<typename _Tp>
+ struct is_rvalue_reference<_Tp&&>
+ : public true_type { };
+
+ // Secondary classification traits.
+
+ /// is_reference
+ template<typename _Tp>
+ struct is_reference
+ : public integral_constant<bool, (is_lvalue_reference<_Tp>::value
+ || is_rvalue_reference<_Tp>::value)>
+ { };
+
+ // Reference transformations.
+
+ /// remove_reference
+ template<typename _Tp>
+ struct remove_reference
+ { typedef _Tp type; };
+
+ template<typename _Tp>
+ struct remove_reference<_Tp&>
+ { typedef _Tp type; };
+
+ template<typename _Tp>
+ struct remove_reference<_Tp&&>
+ { typedef _Tp type; };
+
+ template<typename _Tp,
+ bool = !is_reference<_Tp>::value && !is_void<_Tp>::value,
+ bool = is_rvalue_reference<_Tp>::value>
+ struct __add_lvalue_reference_helper
+ { typedef _Tp type; };
+
+ template<typename _Tp>
+ struct __add_lvalue_reference_helper<_Tp, true, false>
+ { typedef _Tp& type; };
+
+ template<typename _Tp>
+ struct __add_lvalue_reference_helper<_Tp, false, true>
+ { typedef typename remove_reference<_Tp>::type& type; };
+
+ /// add_lvalue_reference
+ template<typename _Tp>
+ struct add_lvalue_reference
+ : public __add_lvalue_reference_helper<_Tp>
+ { };
+
+ template<typename _Tp,
+ bool = !is_reference<_Tp>::value && !is_void<_Tp>::value>
+ struct __add_rvalue_reference_helper
+ { typedef _Tp type; };
+
+ template<typename _Tp>
+ struct __add_rvalue_reference_helper<_Tp, true>
+ { typedef _Tp&& type; };
+
+ /// add_rvalue_reference
+ template<typename _Tp>
+ struct add_rvalue_reference
+ : public __add_rvalue_reference_helper<_Tp>
+ { };
+
+ // Scalar properties and transformations.
+
+ template<typename _Tp,
+ bool = is_integral<_Tp>::value,
+ bool = is_floating_point<_Tp>::value>
+ struct __is_signed_helper
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_signed_helper<_Tp, false, true>
+ : public true_type { };
+
+ template<typename _Tp>
+ struct __is_signed_helper<_Tp, true, false>
+ : public integral_constant<bool, _Tp(-1) < _Tp(0)>
+ { };
+
+ /// is_signed
+ template<typename _Tp>
+ struct is_signed
+ : public integral_constant<bool, __is_signed_helper<_Tp>::value>
+ { };
+
+ /// is_unsigned
+ template<typename _Tp>
+ struct is_unsigned
+ : public integral_constant<bool, (is_arithmetic<_Tp>::value
+ && !is_signed<_Tp>::value)>
+ { };
+
+ // Member introspection.
+
+ /// is_pod
+ template<typename _Tp>
+ struct is_pod
+ : public integral_constant<bool, __is_pod(_Tp)>
+ { };
+
+ /// has_trivial_default_constructor
+ template<typename _Tp>
+ struct has_trivial_default_constructor
+ : public integral_constant<bool, __has_trivial_constructor(_Tp)>
+ { };
+
+ /// has_trivial_copy_constructor
+ template<typename _Tp>
+ struct has_trivial_copy_constructor
+ : public integral_constant<bool, __has_trivial_copy(_Tp)>
+ { };
+
+ /// has_trivial_assign
+ template<typename _Tp>
+ struct has_trivial_assign
+ : public integral_constant<bool, __has_trivial_assign(_Tp)>
+ { };
+
+ /// has_trivial_destructor
+ template<typename _Tp>
+ struct has_trivial_destructor
+ : public integral_constant<bool, __has_trivial_destructor(_Tp)>
+ { };
+
+ /// has_nothrow_default_constructor
+ template<typename _Tp>
+ struct has_nothrow_default_constructor
+ : public integral_constant<bool, __has_nothrow_constructor(_Tp)>
+ { };
+
+ /// has_nothrow_copy_constructor
+ template<typename _Tp>
+ struct has_nothrow_copy_constructor
+ : public integral_constant<bool, __has_nothrow_copy(_Tp)>
+ { };
+
+ /// has_nothrow_assign
+ template<typename _Tp>
+ struct has_nothrow_assign
+ : public integral_constant<bool, __has_nothrow_assign(_Tp)>
+ { };
+
+ /// is_base_of
+ template<typename _Base, typename _Derived>
+ struct is_base_of
+ : public integral_constant<bool, __is_base_of(_Base, _Derived)>
+ { };
+
+ // Relationships between types.
+ template<typename _From, typename _To>
+ struct __is_convertible_simple
+ : public __sfinae_types
+ {
+ private:
+ static __one __test(_To);
+ static __two __test(...);
+ static _From __makeFrom();
+
+ public:
+ static const bool __value = sizeof(__test(__makeFrom())) == 1;
+ };
+
+ template<typename _Tp>
+ struct __is_int_or_cref
+ {
+ typedef typename remove_reference<_Tp>::type __rr_Tp;
+ static const bool __value = (is_integral<_Tp>::value
+ || (is_integral<__rr_Tp>::value
+ && is_const<__rr_Tp>::value
+ && !is_volatile<__rr_Tp>::value));
+ };
+
+ template<typename _From, typename _To,
+ bool = (is_void<_From>::value || is_void<_To>::value
+ || is_function<_To>::value || is_array<_To>::value
+ // This special case is here only to avoid warnings.
+ || (is_floating_point<typename
+ remove_reference<_From>::type>::value
+ && __is_int_or_cref<_To>::__value))>
+ struct __is_convertible_helper
+ {
+ // "An imaginary lvalue of type From...".
+ static const bool __value = (__is_convertible_simple<typename
+ add_lvalue_reference<_From>::type,
+ _To>::__value);
+ };
+
+ template<typename _From, typename _To>
+ struct __is_convertible_helper<_From, _To, true>
+ { static const bool __value = (is_void<_To>::value
+ || (__is_int_or_cref<_To>::__value
+ && !is_void<_From>::value)); };
+
+ // XXX FIXME
+ // The C++0x specifications are different, see N2255.
+ /// is_convertible
+ template<typename _From, typename _To>
+ struct is_convertible
+ : public integral_constant<bool,
+ __is_convertible_helper<_From, _To>::__value>
+ { };
+
+ template<std::size_t _Len>
+ struct __aligned_storage_msa
+ {
+ union __type
+ {
+ unsigned char __data[_Len];
+ struct __attribute__((__aligned__)) { } __align;
+ };
+ };
+
+ /**
+ * @brief Alignment type.
+ *
+ * The value of _Align is a default-alignment which shall be the
+ * most stringent alignment requirement for any C++ object type
+ * whose size is no greater than _Len (3.9). The member typedef
+ * type shall be a POD type suitable for use as uninitialized
+ * storage for any object whose size is at most _Len and whose
+ * alignment is a divisor of _Align.
+ */
+ template<std::size_t _Len, std::size_t _Align =
+ __alignof__(typename __aligned_storage_msa<_Len>::__type)>
+ struct aligned_storage
+ {
+ union type
+ {
+ unsigned char __data[_Len];
+ struct __attribute__((__aligned__((_Align)))) { } __align;
+ };
+ };
+
+
+ // Define a nested type if some predicate holds.
+ // Primary template.
+ /// enable_if
+ template<bool, typename _Tp = void>
+ struct enable_if
+ { };
+
+ // Partial specialization for true.
+ template<typename _Tp>
+ struct enable_if<true, _Tp>
+ { typedef _Tp type; };
+
+
+ // A conditional expression, but for types. If true, first, if false, second.
+ // Primary template.
+ /// conditional
+ template<bool _Cond, typename _Iftrue, typename _Iffalse>
+ struct conditional
+ { typedef _Iftrue type; };
+
+ // Partial specialization for false.
+ template<typename _Iftrue, typename _Iffalse>
+ struct conditional<false, _Iftrue, _Iffalse>
+ { typedef _Iffalse type; };
+
+
+ // Decay trait for arrays and functions, used for perfect forwarding
+ // in make_pair, make_tuple, etc.
+ template<typename _Up,
+ bool _IsArray = is_array<_Up>::value,
+ bool _IsFunction = is_function<_Up>::value>
+ struct __decay_selector;
+
+ // NB: DR 705.
+ template<typename _Up>
+ struct __decay_selector<_Up, false, false>
+ { typedef typename remove_cv<_Up>::type __type; };
+
+ template<typename _Up>
+ struct __decay_selector<_Up, true, false>
+ { typedef typename remove_extent<_Up>::type* __type; };
+
+ template<typename _Up>
+ struct __decay_selector<_Up, false, true>
+ { typedef typename add_pointer<_Up>::type __type; };
+
+ /// decay
+ template<typename _Tp>
+ struct decay
+ {
+ private:
+ typedef typename remove_reference<_Tp>::type __remove_type;
+
+ public:
+ typedef typename __decay_selector<__remove_type>::__type type;
+ };
+
+
+ // Utility for constructing identically cv-qualified types.
+ template<typename _Unqualified, bool _IsConst, bool _IsVol>
+ struct __cv_selector;
+
+ template<typename _Unqualified>
+ struct __cv_selector<_Unqualified, false, false>
+ { typedef _Unqualified __type; };
+
+ template<typename _Unqualified>
+ struct __cv_selector<_Unqualified, false, true>
+ { typedef volatile _Unqualified __type; };
+
+ template<typename _Unqualified>
+ struct __cv_selector<_Unqualified, true, false>
+ { typedef const _Unqualified __type; };
+
+ template<typename _Unqualified>
+ struct __cv_selector<_Unqualified, true, true>
+ { typedef const volatile _Unqualified __type; };
+
+ template<typename _Qualified, typename _Unqualified,
+ bool _IsConst = is_const<_Qualified>::value,
+ bool _IsVol = is_volatile<_Qualified>::value>
+ struct __match_cv_qualifiers
+ {
+ private:
+ typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
+
+ public:
+ typedef typename __match::__type __type;
+ };
+
+
+ // Utility for finding the unsigned versions of signed integral types.
+ template<typename _Tp>
+ struct __make_unsigned
+ { typedef _Tp __type; };
+
+ template<>
+ struct __make_unsigned<char>
+ { typedef unsigned char __type; };
+
+ template<>
+ struct __make_unsigned<signed char>
+ { typedef unsigned char __type; };
+
+ template<>
+ struct __make_unsigned<short>
+ { typedef unsigned short __type; };
+
+ template<>
+ struct __make_unsigned<int>
+ { typedef unsigned int __type; };
+
+ template<>
+ struct __make_unsigned<long>
+ { typedef unsigned long __type; };
+
+ template<>
+ struct __make_unsigned<long long>
+ { typedef unsigned long long __type; };
+
+
+ // Select between integral and enum: not possible to be both.
+ template<typename _Tp,
+ bool _IsInt = is_integral<_Tp>::value,
+ bool _IsEnum = is_enum<_Tp>::value>
+ struct __make_unsigned_selector;
+
+ template<typename _Tp>
+ struct __make_unsigned_selector<_Tp, true, false>
+ {
+ private:
+ typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt;
+ typedef typename __unsignedt::__type __unsigned_type;
+ typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
+
+ public:
+ typedef typename __cv_unsigned::__type __type;
+ };
+
+ template<typename _Tp>
+ struct __make_unsigned_selector<_Tp, false, true>
+ {
+ private:
+ // With -fshort-enums, an enum may be as small as a char.
+ typedef unsigned char __smallest;
+ static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
+ static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short);
+ static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int);
+ typedef conditional<__b2, unsigned int, unsigned long> __cond2;
+ typedef typename __cond2::type __cond2_type;
+ typedef conditional<__b1, unsigned short, __cond2_type> __cond1;
+ typedef typename __cond1::type __cond1_type;
+
+ public:
+ typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
+ };
+
+ // Given an integral/enum type, return the corresponding unsigned
+ // integer type.
+ // Primary template.
+ /// make_unsigned
+ template<typename _Tp>
+ struct make_unsigned
+ { typedef typename __make_unsigned_selector<_Tp>::__type type; };
+
+ // Integral, but don't define.
+ template<>
+ struct make_unsigned<bool>;
+
+
+ // 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; };
+
+
+ // Select between integral and enum: not possible to be both.
+ template<typename _Tp,
+ bool _IsInt = is_integral<_Tp>::value,
+ bool _IsEnum = is_enum<_Tp>::value>
+ struct __make_signed_selector;
+
+ template<typename _Tp>
+ struct __make_signed_selector<_Tp, true, false>
+ {
+ private:
+ typedef __make_signed<typename remove_cv<_Tp>::type> __signedt;
+ typedef typename __signedt::__type __signed_type;
+ typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed;
+
+ public:
+ typedef typename __cv_signed::__type __type;
+ };
+
+ template<typename _Tp>
+ struct __make_signed_selector<_Tp, false, true>
+ {
+ private:
+ // With -fshort-enums, an enum may be as small as a char.
+ typedef signed char __smallest;
+ static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
+ static const bool __b1 = sizeof(_Tp) <= sizeof(signed short);
+ static const bool __b2 = sizeof(_Tp) <= sizeof(signed int);
+ typedef conditional<__b2, signed int, signed long> __cond2;
+ typedef typename __cond2::type __cond2_type;
+ typedef conditional<__b1, signed short, __cond2_type> __cond1;
+ typedef typename __cond1::type __cond1_type;
+
+ public:
+ typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
+ };
+
+ // Given an integral/enum type, return the corresponding signed
+ // integer type.
+ // Primary template.
+ /// make_signed
+ template<typename _Tp>
+ struct make_signed
+ { typedef typename __make_signed_selector<_Tp>::__type type; };
+
+ // Integral, but don't define.
+ template<>
+ struct make_signed<bool>;
+
+ /// common_type
+ template<typename... _Tp>
+ struct common_type;
+
+ template<typename _Tp>
+ struct common_type<_Tp>
+ {
+ static_assert(sizeof(_Tp) > 0, "must be complete type");
+ typedef _Tp type;
+ };
+
+ template<typename _Tp, typename _Up>
+ class common_type<_Tp, _Up>
+ {
+ static_assert(sizeof(_Tp) > 0, "must be complete type");
+ static_assert(sizeof(_Up) > 0, "must be complete type");
+
+ static _Tp&& __t();
+ static _Up&& __u();
+
+ // HACK: Prevents optimization of ?: in the decltype
+ // expression when the condition is the literal, "true".
+ // See, PR36628.
+ static bool __true_or_false();
+
+ public:
+ typedef decltype(__true_or_false() ? __t() : __u()) type;
+ };
+
+ template<typename _Tp, typename _Up, typename... _Vp>
+ struct common_type<_Tp, _Up, _Vp...>
+ {
+ typedef typename
+ common_type<typename common_type<_Tp, _Up>::type, _Vp...>::type type;
+ };
+
+ // @} group metaprogramming
+}
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+#endif // _GLIBCXX_TYPE_TRAITS
+
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