--- /dev/null
+// C++11 type_traits -*- C++ -*-
+
+// Copyright (C) 2007, 2008, 2009, 2010, 2011 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 <bits/c++0x_warning.h>
+#else
+
+#include <bits/c++config.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @defgroup metaprogramming Metaprogramming and type traits
+ * @ingroup utilities
+ *
+ * Template utilities for compile-time introspection and modification,
+ * including type classification traits, type property inspection traits
+ * and type transformation traits.
+ *
+ * @{
+ */
+
+ /// integral_constant
+ template<typename _Tp, _Tp __v>
+ struct integral_constant
+ {
+ static constexpr _Tp value = __v;
+ typedef _Tp value_type;
+ typedef integral_constant<_Tp, __v> type;
+ constexpr operator value_type() { return value; }
+ };
+
+ /// The type used as a compile-time boolean with true value.
+ typedef integral_constant<bool, true> true_type;
+
+ /// The type used as a compile-time boolean with false value.
+ typedef integral_constant<bool, false> false_type;
+
+ template<typename _Tp, _Tp __v>
+ constexpr _Tp integral_constant<_Tp, __v>::value;
+
+ // Meta programming helper types.
+
+ template<bool, typename, typename>
+ struct conditional;
+
+ template<typename...>
+ struct __or_;
+
+ template<>
+ struct __or_<>
+ : public false_type
+ { };
+
+ template<typename _B1>
+ struct __or_<_B1>
+ : public _B1
+ { };
+
+ template<typename _B1, typename _B2>
+ struct __or_<_B1, _B2>
+ : public conditional<_B1::value, _B1, _B2>::type
+ { };
+
+ template<typename _B1, typename _B2, typename _B3, typename... _Bn>
+ struct __or_<_B1, _B2, _B3, _Bn...>
+ : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type
+ { };
+
+ template<typename...>
+ struct __and_;
+
+ template<>
+ struct __and_<>
+ : public true_type
+ { };
+
+ template<typename _B1>
+ struct __and_<_B1>
+ : public _B1
+ { };
+
+ template<typename _B1, typename _B2>
+ struct __and_<_B1, _B2>
+ : public conditional<_B1::value, _B2, _B1>::type
+ { };
+
+ template<typename _B1, typename _B2, typename _B3, typename... _Bn>
+ struct __and_<_B1, _B2, _B3, _Bn...>
+ : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type
+ { };
+
+ template<typename _Pp>
+ struct __not_
+ : public integral_constant<bool, !_Pp::value>
+ { };
+
+ struct __sfinae_types
+ {
+ typedef char __one;
+ typedef struct { char __arr[2]; } __two;
+ };
+
+ // primary type categories.
+
+ template<typename>
+ struct remove_cv;
+
+ template<typename>
+ struct __is_void_helper
+ : public false_type { };
+
+ template<>
+ struct __is_void_helper<void>
+ : public true_type { };
+
+ /// is_void
+ template<typename _Tp>
+ struct is_void
+ : public integral_constant<bool, (__is_void_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
+
+ template<typename>
+ struct __is_integral_helper
+ : public false_type { };
+
+ template<>
+ struct __is_integral_helper<bool>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<char>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<signed char>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<unsigned char>
+ : public true_type { };
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ template<>
+ struct __is_integral_helper<wchar_t>
+ : public true_type { };
+#endif
+
+ template<>
+ struct __is_integral_helper<char16_t>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<char32_t>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<short>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<unsigned short>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<int>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<unsigned int>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<long>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<unsigned long>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<long long>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<unsigned long long>
+ : public true_type { };
+
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128)
+ template<>
+ struct __is_integral_helper<__int128>
+ : public true_type { };
+
+ template<>
+ struct __is_integral_helper<unsigned __int128>
+ : public true_type { };
+#endif
+
+ /// is_integral
+ template<typename _Tp>
+ struct is_integral
+ : public integral_constant<bool, (__is_integral_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
+
+ template<typename>
+ struct __is_floating_point_helper
+ : public false_type { };
+
+ template<>
+ struct __is_floating_point_helper<float>
+ : public true_type { };
+
+ template<>
+ struct __is_floating_point_helper<double>
+ : public true_type { };
+
+ template<>
+ struct __is_floating_point_helper<long double>
+ : public true_type { };
+
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
+ template<>
+ struct __is_floating_point_helper<__float128>
+ : public true_type { };
+#endif
+
+ /// is_floating_point
+ template<typename _Tp>
+ struct is_floating_point
+ : public integral_constant<bool, (__is_floating_point_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
+
+ /// is_array
+ template<typename>
+ struct is_array
+ : public false_type { };
+
+ template<typename _Tp, std::size_t _Size>
+ struct is_array<_Tp[_Size]>
+ : public true_type { };
+
+ template<typename _Tp>
+ struct is_array<_Tp[]>
+ : public true_type { };
+
+ template<typename>
+ struct __is_pointer_helper
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_pointer_helper<_Tp*>
+ : public true_type { };
+
+ /// is_pointer
+ template<typename _Tp>
+ struct is_pointer
+ : public integral_constant<bool, (__is_pointer_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
+
+ /// 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 { };
+
+ template<typename>
+ struct is_function;
+
+ template<typename>
+ struct __is_member_object_pointer_helper
+ : public false_type { };
+
+ template<typename _Tp, typename _Cp>
+ struct __is_member_object_pointer_helper<_Tp _Cp::*>
+ : public integral_constant<bool, !is_function<_Tp>::value> { };
+
+ /// is_member_object_pointer
+ template<typename _Tp>
+ struct is_member_object_pointer
+ : public integral_constant<bool, (__is_member_object_pointer_helper<
+ typename remove_cv<_Tp>::type>::value)>
+ { };
+
+ template<typename>
+ struct __is_member_function_pointer_helper
+ : public false_type { };
+
+ template<typename _Tp, typename _Cp>
+ struct __is_member_function_pointer_helper<_Tp _Cp::*>
+ : public integral_constant<bool, is_function<_Tp>::value> { };
+
+ /// is_member_function_pointer
+ template<typename _Tp>
+ struct is_member_function_pointer
+ : public integral_constant<bool, (__is_member_function_pointer_helper<
+ typename remove_cv<_Tp>::type>::value)>
+ { };
+
+ /// is_enum
+ template<typename _Tp>
+ struct is_enum
+ : public integral_constant<bool, __is_enum(_Tp)>
+ { };
+
+ /// is_union
+ template<typename _Tp>
+ struct is_union
+ : public integral_constant<bool, __is_union(_Tp)>
+ { };
+
+ /// is_class
+ template<typename _Tp>
+ struct is_class
+ : public integral_constant<bool, __is_class(_Tp)>
+ { };
+
+ /// is_function
+ template<typename>
+ struct is_function
+ : public false_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes...)>
+ : public true_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes......)>
+ : public true_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes...) const>
+ : public true_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes......) const>
+ : public true_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes...) volatile>
+ : public true_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes......) volatile>
+ : public true_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes...) const volatile>
+ : public true_type { };
+
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes......) const volatile>
+ : public true_type { };
+
+ template<typename>
+ struct __is_nullptr_t_helper
+ : public false_type { };
+
+ template<>
+ struct __is_nullptr_t_helper<std::nullptr_t>
+ : public true_type { };
+
+ // __is_nullptr_t (extension).
+ template<typename _Tp>
+ struct __is_nullptr_t
+ : public integral_constant<bool, (__is_nullptr_t_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
+
+ // composite type categories.
+
+ /// is_reference
+ template<typename _Tp>
+ struct is_reference
+ : public __or_<is_lvalue_reference<_Tp>,
+ is_rvalue_reference<_Tp>>::type
+ { };
+
+ /// is_arithmetic
+ template<typename _Tp>
+ struct is_arithmetic
+ : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
+ { };
+
+ /// is_fundamental
+ template<typename _Tp>
+ struct is_fundamental
+ : public __or_<is_arithmetic<_Tp>, is_void<_Tp>>::type
+ { };
+
+ /// is_object
+ template<typename _Tp>
+ struct is_object
+ : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
+ is_void<_Tp>>>::type
+ { };
+
+ template<typename>
+ struct is_member_pointer;
+
+ /// is_scalar
+ template<typename _Tp>
+ struct is_scalar
+ : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
+ is_member_pointer<_Tp>, __is_nullptr_t<_Tp>>::type
+ { };
+
+ /// is_compound
+ template<typename _Tp>
+ struct is_compound
+ : public integral_constant<bool, !is_fundamental<_Tp>::value> { };
+
+ template<typename _Tp>
+ struct __is_member_pointer_helper
+ : public false_type { };
+
+ template<typename _Tp, typename _Cp>
+ struct __is_member_pointer_helper<_Tp _Cp::*>
+ : public true_type { };
+
+ /// is_member_pointer
+ template<typename _Tp>
+ struct is_member_pointer
+ : public integral_constant<bool, (__is_member_pointer_helper<
+ typename remove_cv<_Tp>::type>::value)>
+ { };
+
+ // type properties.
+
+ /// is_const
+ template<typename>
+ struct is_const
+ : public false_type { };
+
+ template<typename _Tp>
+ struct is_const<_Tp const>
+ : public true_type { };
+
+ /// is_volatile
+ template<typename>
+ struct is_volatile
+ : public false_type { };
+
+ template<typename _Tp>
+ struct is_volatile<_Tp volatile>
+ : public true_type { };
+
+ /// is_trivial
+ template<typename _Tp>
+ struct is_trivial
+ : public integral_constant<bool, __is_trivial(_Tp)>
+ { };
+
+ // is_trivially_copyable (still unimplemented)
+
+ /// is_standard_layout
+ template<typename _Tp>
+ struct is_standard_layout
+ : public integral_constant<bool, __is_standard_layout(_Tp)>
+ { };
+
+ /// is_pod
+ // Could use is_standard_layout && is_trivial instead of the builtin.
+ template<typename _Tp>
+ struct is_pod
+ : public integral_constant<bool, __is_pod(_Tp)>
+ { };
+
+ /// is_literal_type
+ template<typename _Tp>
+ struct is_literal_type
+ : public integral_constant<bool, __is_literal_type(_Tp)>
+ { };
+
+ /// is_empty
+ template<typename _Tp>
+ struct is_empty
+ : public integral_constant<bool, __is_empty(_Tp)>
+ { };
+
+ /// is_polymorphic
+ template<typename _Tp>
+ struct is_polymorphic
+ : public integral_constant<bool, __is_polymorphic(_Tp)>
+ { };
+
+ /// is_abstract
+ template<typename _Tp>
+ struct is_abstract
+ : public integral_constant<bool, __is_abstract(_Tp)>
+ { };
+
+ 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, static_cast<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 __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type
+ { };
+
+
+ // destructible and constructible type properties
+
+ template<typename>
+ struct add_rvalue_reference;
+
+ /**
+ * @brief Utility to simplify expressions used in unevaluated operands
+ * @ingroup utilities
+ */
+ template<typename _Tp>
+ typename add_rvalue_reference<_Tp>::type declval() noexcept;
+
+ template<typename, unsigned = 0>
+ struct extent;
+
+ template<typename>
+ struct remove_all_extents;
+
+ template<typename _Tp>
+ struct __is_array_known_bounds
+ : public integral_constant<bool, (extent<_Tp>::value > 0)>
+ { };
+
+ template<typename _Tp>
+ struct __is_array_unknown_bounds
+ : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>::type
+ { };
+
+ // In N3290 is_destructible does not say anything about function
+ // types and abstract types, see LWG 2049. This implementation
+ // describes function types as trivially nothrow destructible and
+ // abstract types as destructible, iff the explicit destructor
+ // call expression is wellformed.
+ struct __do_is_destructible_impl_1
+ {
+ template<typename _Up>
+ struct __w { _Up __u; };
+
+ template<typename _Tp, typename
+ = decltype(declval<__w<_Tp>&>().~__w<_Tp>())>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+ };
+
+ template<typename _Tp>
+ struct __is_destructible_impl_1
+ : public __do_is_destructible_impl_1
+ {
+ typedef decltype(__test<_Tp>(0)) type;
+ };
+
+ // Special implementation for abstract types
+ struct __do_is_destructible_impl_2
+ {
+ template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+ };
+
+ template<typename _Tp>
+ struct __is_destructible_impl_2
+ : public __do_is_destructible_impl_2
+ {
+ typedef decltype(__test<_Tp>(0)) type;
+ };
+
+ template<typename _Tp,
+ bool = __or_<is_void<_Tp>,
+ __is_array_unknown_bounds<_Tp>>::value,
+ bool = __or_<is_reference<_Tp>, is_function<_Tp>>::value>
+ struct __is_destructible_safe;
+
+ template<typename _Tp>
+ struct __is_destructible_safe<_Tp, false, false>
+ : public conditional<is_abstract<_Tp>::value,
+ __is_destructible_impl_2<_Tp>,
+ __is_destructible_impl_1<_Tp>>::type::type
+ { };
+
+ template<typename _Tp>
+ struct __is_destructible_safe<_Tp, true, false>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_destructible_safe<_Tp, false, true>
+ : public true_type { };
+
+ /// is_destructible
+ template<typename _Tp>
+ struct is_destructible
+ : public integral_constant<bool, (__is_destructible_safe<_Tp>::value)>
+ { };
+
+ struct __do_is_default_constructible_impl
+ {
+ template<typename _Tp, typename = decltype(_Tp())>
+ static true_type __test(int);
+
+ template<typename>
+ static false_type __test(...);
+ };
+
+ template<typename _Tp>
+ struct __is_default_constructible_impl
+ : public __do_is_default_constructible_impl
+ {
+ typedef decltype(__test<_Tp>(0)) type;
+ };
+
+ template<typename _Tp>
+ struct __is_default_constructible_atom
+ : public __and_<__not_<is_void<_Tp>>,
+ __is_default_constructible_impl<_Tp>>::type
+ { };
+
+ template<typename _Tp, bool = is_array<_Tp>::value>
+ struct __is_default_constructible_safe;
+
+ // The following technique is a workaround for a current core language
+ // restriction, which does not allow for array types to occur in
+ // functional casts of the form T(). Complete arrays can be default-
+ // constructed, if the element type is default-constructible, but
+ // arrays with unknown bounds are not.
+ template<typename _Tp>
+ struct __is_default_constructible_safe<_Tp, true>
+ : public __and_<__is_array_known_bounds<_Tp>,
+ __is_default_constructible_atom<typename
+ remove_all_extents<_Tp>::type>>::type
+ { };
+
+ template<typename _Tp>
+ struct __is_default_constructible_safe<_Tp, false>
+ : public __is_default_constructible_atom<_Tp>::type
+ { };
+
+ /// is_default_constructible
+ template<typename _Tp>
+ struct is_default_constructible
+ : public integral_constant<bool, (__is_default_constructible_safe<
+ _Tp>::value)>
+ { };
+
+
+ // Implementation of is_constructible.
+
+ // The hardest part of this trait is the binary direct-initialization
+ // case, because we hit into a functional cast of the form T(arg).
+ // This implementation uses different strategies depending on the
+ // target type to reduce the test overhead as much as possible:
+ //
+ // a) For a reference target type, we use a static_cast expression
+ // modulo its extra cases.
+ //
+ // b) For a non-reference target type we use a ::new expression.
+ struct __do_is_static_castable_impl
+ {
+ template<typename _From, typename _To, typename
+ = decltype(static_cast<_To>(declval<_From>()))>
+ static true_type __test(int);
+
+ template<typename, typename>
+ static false_type __test(...);
+ };
+
+ template<typename _From, typename _To>
+ struct __is_static_castable_impl
+ : public __do_is_static_castable_impl
+ {
+ typedef decltype(__test<_From, _To>(0)) type;
+ };
+
+ template<typename _From, typename _To>
+ struct __is_static_castable_safe
+ : public __is_static_castable_impl<_From, _To>::type
+ { };
+
+ // __is_static_castable
+ template<typename _From, typename _To>
+ struct __is_static_castable
+ : public integral_constant<bool, (__is_static_castable_safe<
+ _From, _To>::value)>
+ { };
+
+ // Implementation for non-reference types. To meet the proper
+ // variable definition semantics, we also need to test for
+ // is_destructible in this case.
+ // This form should be simplified by a single expression:
+ // ::delete ::new _Tp(declval<_Arg>()), see c++/51222.
+ struct __do_is_direct_constructible_impl
+ {
+ template<typename _Tp, typename _Arg, typename
+ = decltype(::new _Tp(declval<_Arg>()))>
+ static true_type __test(int);
+
+ template<typename, typename>
+ static false_type __test(...);
+ };
+
+ template<typename _Tp, typename _Arg>
+ struct __is_direct_constructible_impl
+ : public __do_is_direct_constructible_impl
+ {
+ typedef decltype(__test<_Tp, _Arg>(0)) type;
+ };
+
+ template<typename _Tp, typename _Arg>
+ struct __is_direct_constructible_new_safe
+ : public __and_<is_destructible<_Tp>,
+ __is_direct_constructible_impl<_Tp, _Arg>>::type
+ { };
+
+ template<typename, typename>
+ struct is_same;
+
+ template<typename, typename>
+ struct is_base_of;
+
+ template<typename>
+ struct remove_reference;
+
+ template<typename _From, typename _To, bool
+ = __not_<__or_<is_void<_From>,
+ is_function<_From>>>::value>
+ struct __is_base_to_derived_ref;
+
+ // Detect whether we have a downcast situation during
+ // reference binding.
+ template<typename _From, typename _To>
+ struct __is_base_to_derived_ref<_From, _To, true>
+ {
+ typedef typename remove_cv<typename remove_reference<_From
+ >::type>::type __src_t;
+ typedef typename remove_cv<typename remove_reference<_To
+ >::type>::type __dst_t;
+ typedef __and_<__not_<is_same<__src_t, __dst_t>>,
+ is_base_of<__src_t, __dst_t>> type;
+ static constexpr bool value = type::value;
+ };
+
+ template<typename _From, typename _To>
+ struct __is_base_to_derived_ref<_From, _To, false>
+ : public false_type
+ { };
+
+ template<typename _From, typename _To, bool
+ = __and_<is_lvalue_reference<_From>,
+ is_rvalue_reference<_To>>::value>
+ struct __is_lvalue_to_rvalue_ref;
+
+ // Detect whether we have an lvalue of non-function type
+ // bound to a reference-compatible rvalue-reference.
+ template<typename _From, typename _To>
+ struct __is_lvalue_to_rvalue_ref<_From, _To, true>
+ {
+ typedef typename remove_cv<typename remove_reference<
+ _From>::type>::type __src_t;
+ typedef typename remove_cv<typename remove_reference<
+ _To>::type>::type __dst_t;
+ typedef __and_<__not_<is_function<__src_t>>,
+ __or_<is_same<__src_t, __dst_t>,
+ is_base_of<__dst_t, __src_t>>> type;
+ static constexpr bool value = type::value;
+ };
+
+ template<typename _From, typename _To>
+ struct __is_lvalue_to_rvalue_ref<_From, _To, false>
+ : public false_type
+ { };
+
+ // Here we handle direct-initialization to a reference type as
+ // equivalent to a static_cast modulo overshooting conversions.
+ // These are restricted to the following conversions:
+ // a) A base class value to a derived class reference
+ // b) An lvalue to an rvalue-reference of reference-compatible
+ // types that are not functions
+ template<typename _Tp, typename _Arg>
+ struct __is_direct_constructible_ref_cast
+ : public __and_<__is_static_castable<_Arg, _Tp>,
+ __not_<__or_<__is_base_to_derived_ref<_Arg, _Tp>,
+ __is_lvalue_to_rvalue_ref<_Arg, _Tp>
+ >>>::type
+ { };
+
+ template<typename _Tp, typename _Arg>
+ struct __is_direct_constructible_new
+ : public conditional<is_reference<_Tp>::value,
+ __is_direct_constructible_ref_cast<_Tp, _Arg>,
+ __is_direct_constructible_new_safe<_Tp, _Arg>
+ >::type
+ { };
+
+ template<typename _Tp, typename _Arg>
+ struct __is_direct_constructible
+ : public integral_constant<bool, (__is_direct_constructible_new<
+ _Tp, _Arg>::value)>
+ { };
+
+ // Since default-construction and binary direct-initialization have
+ // been handled separately, the implementation of the remaining
+ // n-ary construction cases is rather straightforward. We can use
+ // here a functional cast, because array types are excluded anyway
+ // and this form is never interpreted as a C cast.
+ struct __do_is_nary_constructible_impl
+ {
+ template<typename _Tp, typename... _Args, typename
+ = decltype(_Tp(declval<_Args>()...))>
+ static true_type __test(int);
+
+ template<typename, typename...>
+ static false_type __test(...);
+ };
+
+ template<typename _Tp, typename... _Args>
+ struct __is_nary_constructible_impl
+ : public __do_is_nary_constructible_impl
+ {
+ typedef decltype(__test<_Tp, _Args...>(0)) type;
+ };
+
+ template<typename _Tp, typename... _Args>
+ struct __is_nary_constructible
+ : public __is_nary_constructible_impl<_Tp, _Args...>::type
+ {
+ static_assert(sizeof...(_Args) > 1,
+ "Only useful for > 1 arguments");
+ };
+
+ template<typename _Tp, typename... _Args>
+ struct __is_constructible_impl
+ : public __is_nary_constructible<_Tp, _Args...>
+ { };
+
+ template<typename _Tp, typename _Arg>
+ struct __is_constructible_impl<_Tp, _Arg>
+ : public __is_direct_constructible<_Tp, _Arg>
+ { };
+
+ template<typename _Tp>
+ struct __is_constructible_impl<_Tp>
+ : public is_default_constructible<_Tp>
+ { };
+
+ /// is_constructible
+ template<typename _Tp, typename... _Args>
+ struct is_constructible
+ : public integral_constant<bool, (__is_constructible_impl<_Tp,
+ _Args...>::value)>
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_copy_constructible_impl;
+
+ template<typename _Tp>
+ struct __is_copy_constructible_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_copy_constructible_impl<_Tp, false>
+ : public is_constructible<_Tp, const _Tp&>
+ { };
+
+ /// is_copy_constructible
+ template<typename _Tp>
+ struct is_copy_constructible
+ : public __is_copy_constructible_impl<_Tp>
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_move_constructible_impl;
+
+ template<typename _Tp>
+ struct __is_move_constructible_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_move_constructible_impl<_Tp, false>
+ : public is_constructible<_Tp, _Tp&&>
+ { };
+
+ /// is_move_constructible
+ template<typename _Tp>
+ struct is_move_constructible
+ : public __is_move_constructible_impl<_Tp>
+ { };
+
+ template<typename _Tp>
+ struct __is_nt_default_constructible_atom
+ : public integral_constant<bool, noexcept(_Tp())>
+ { };
+
+ template<typename _Tp, bool = is_array<_Tp>::value>
+ struct __is_nt_default_constructible_impl;
+
+ template<typename _Tp>
+ struct __is_nt_default_constructible_impl<_Tp, true>
+ : public __and_<__is_array_known_bounds<_Tp>,
+ __is_nt_default_constructible_atom<typename
+ remove_all_extents<_Tp>::type>>::type
+ { };
+
+ template<typename _Tp>
+ struct __is_nt_default_constructible_impl<_Tp, false>
+ : public __is_nt_default_constructible_atom<_Tp>
+ { };
+
+ /// is_nothrow_default_constructible
+ template<typename _Tp>
+ struct is_nothrow_default_constructible
+ : public __and_<is_default_constructible<_Tp>,
+ __is_nt_default_constructible_impl<_Tp>>::type
+ { };
+
+ template<typename _Tp, typename... _Args>
+ struct __is_nt_constructible_impl
+ : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))>
+ { };
+
+ template<typename _Tp, typename _Arg>
+ struct __is_nt_constructible_impl<_Tp, _Arg>
+ : public integral_constant<bool,
+ noexcept(static_cast<_Tp>(declval<_Arg>()))>
+ { };
+
+ template<typename _Tp>
+ struct __is_nt_constructible_impl<_Tp>
+ : public is_nothrow_default_constructible<_Tp>
+ { };
+
+ /// is_nothrow_constructible
+ template<typename _Tp, typename... _Args>
+ struct is_nothrow_constructible
+ : public __and_<is_constructible<_Tp, _Args...>,
+ __is_nt_constructible_impl<_Tp, _Args...>>::type
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_nothrow_copy_constructible_impl;
+
+ template<typename _Tp>
+ struct __is_nothrow_copy_constructible_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_nothrow_copy_constructible_impl<_Tp, false>
+ : public is_nothrow_constructible<_Tp, const _Tp&>
+ { };
+
+ /// is_nothrow_copy_constructible
+ template<typename _Tp>
+ struct is_nothrow_copy_constructible
+ : public __is_nothrow_copy_constructible_impl<_Tp>
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_nothrow_move_constructible_impl;
+
+ template<typename _Tp>
+ struct __is_nothrow_move_constructible_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_nothrow_move_constructible_impl<_Tp, false>
+ : public is_nothrow_constructible<_Tp, _Tp&&>
+ { };
+
+ /// is_nothrow_move_constructible
+ template<typename _Tp>
+ struct is_nothrow_move_constructible
+ : public __is_nothrow_move_constructible_impl<_Tp>
+ { };
+
+ template<typename _Tp, typename _Up>
+ class __is_assignable_helper
+ : public __sfinae_types
+ {
+ template<typename _Tp1, typename _Up1>
+ static decltype(declval<_Tp1>() = declval<_Up1>(), __one())
+ __test(int);
+
+ template<typename, typename>
+ static __two __test(...);
+
+ public:
+ static constexpr bool value = sizeof(__test<_Tp, _Up>(0)) == 1;
+ };
+
+ /// is_assignable
+ template<typename _Tp, typename _Up>
+ struct is_assignable
+ : public integral_constant<bool,
+ __is_assignable_helper<_Tp, _Up>::value>
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_copy_assignable_impl;
+
+ template<typename _Tp>
+ struct __is_copy_assignable_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_copy_assignable_impl<_Tp, false>
+ : public is_assignable<_Tp&, const _Tp&>
+ { };
+
+ /// is_copy_assignable
+ template<typename _Tp>
+ struct is_copy_assignable
+ : public __is_copy_assignable_impl<_Tp>
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_move_assignable_impl;
+
+ template<typename _Tp>
+ struct __is_move_assignable_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_move_assignable_impl<_Tp, false>
+ : public is_assignable<_Tp&, _Tp&&>
+ { };
+
+ /// is_move_assignable
+ template<typename _Tp>
+ struct is_move_assignable
+ : public __is_move_assignable_impl<_Tp>
+ { };
+
+ template<typename _Tp, typename _Up>
+ struct __is_nt_assignable_impl
+ : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
+ { };
+
+ /// is_nothrow_assignable
+ template<typename _Tp, typename _Up>
+ struct is_nothrow_assignable
+ : public __and_<is_assignable<_Tp, _Up>,
+ __is_nt_assignable_impl<_Tp, _Up>>::type
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_nt_copy_assignable_impl;
+
+ template<typename _Tp>
+ struct __is_nt_copy_assignable_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_nt_copy_assignable_impl<_Tp, false>
+ : public is_nothrow_assignable<_Tp&, const _Tp&>
+ { };
+
+ /// is_nothrow_copy_assignable
+ template<typename _Tp>
+ struct is_nothrow_copy_assignable
+ : public __is_nt_copy_assignable_impl<_Tp>
+ { };
+
+ template<typename _Tp, bool = is_void<_Tp>::value>
+ struct __is_nt_move_assignable_impl;
+
+ template<typename _Tp>
+ struct __is_nt_move_assignable_impl<_Tp, true>
+ : public false_type { };
+
+ template<typename _Tp>
+ struct __is_nt_move_assignable_impl<_Tp, false>
+ : public is_nothrow_assignable<_Tp&, _Tp&&>
+ { };
+
+ /// is_nothrow_move_assignable
+ template<typename _Tp>
+ struct is_nothrow_move_assignable
+ : public __is_nt_move_assignable_impl<_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_copy_assign
+ template<typename _Tp>
+ struct has_trivial_copy_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_virtual_destructor
+ template<typename _Tp>
+ struct has_virtual_destructor
+ : public integral_constant<bool, __has_virtual_destructor(_Tp)>
+ { };
+
+
+ // type property queries.
+
+ /// alignment_of
+ template<typename _Tp>
+ struct alignment_of
+ : public integral_constant<std::size_t, __alignof__(_Tp)> { };
+
+ /// rank
+ template<typename>
+ struct rank
+ : public integral_constant<std::size_t, 0> { };
+
+ template<typename _Tp, std::size_t _Size>
+ struct rank<_Tp[_Size]>
+ : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
+
+ template<typename _Tp>
+ struct rank<_Tp[]>
+ : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
+
+ /// extent
+ template<typename, unsigned _Uint>
+ struct extent
+ : public integral_constant<std::size_t, 0> { };
+
+ template<typename _Tp, unsigned _Uint, std::size_t _Size>
+ struct extent<_Tp[_Size], _Uint>
+ : public integral_constant<std::size_t,
+ _Uint == 0 ? _Size : extent<_Tp,
+ _Uint - 1>::value>
+ { };
+
+ template<typename _Tp, unsigned _Uint>
+ struct extent<_Tp[], _Uint>
+ : public integral_constant<std::size_t,
+ _Uint == 0 ? 0 : extent<_Tp,
+ _Uint - 1>::value>
+ { };
+
+
+ // type relations.
+
+ /// is_same
+ template<typename, typename>
+ struct is_same
+ : public false_type { };
+
+ template<typename _Tp>
+ struct is_same<_Tp, _Tp>
+ : public true_type { };
+
+ /// is_base_of
+ template<typename _Base, typename _Derived>
+ struct is_base_of
+ : public integral_constant<bool, __is_base_of(_Base, _Derived)>
+ { };
+
+ template<typename _From, typename _To,
+ bool = __or_<is_void<_From>, is_function<_To>,
+ is_array<_To>>::value>
+ struct __is_convertible_helper
+ { static constexpr bool value = is_void<_To>::value; };
+
+ template<typename _From, typename _To>
+ class __is_convertible_helper<_From, _To, false>
+ : public __sfinae_types
+ {
+ template<typename _To1>
+ static void __test_aux(_To1);
+
+ template<typename _From1, typename _To1>
+ static decltype(__test_aux<_To1>(std::declval<_From1>()), __one())
+ __test(int);
+
+ template<typename, typename>
+ static __two __test(...);
+
+ public:
+ static constexpr bool value = sizeof(__test<_From, _To>(0)) == 1;
+ };
+
+ /// is_convertible
+ template<typename _From, typename _To>
+ struct is_convertible
+ : public integral_constant<bool,
+ __is_convertible_helper<_From, _To>::value>
+ { };
+
+ /// is_explicitly_convertible
+ template<typename _From, typename _To>
+ struct is_explicitly_convertible
+ : public is_constructible<_To, _From>
+ { };
+
+
+ // const-volatile modifications.
+
+ /// remove_const
+ template<typename _Tp>
+ struct remove_const
+ { typedef _Tp type; };
+
+ template<typename _Tp>
+ struct remove_const<_Tp const>
+ { typedef _Tp type; };
+
+ /// remove_volatile
+ template<typename _Tp>
+ struct remove_volatile
+ { typedef _Tp type; };
+
+ template<typename _Tp>
+ struct remove_volatile<_Tp volatile>
+ { typedef _Tp type; };
+
+ /// remove_cv
+ template<typename _Tp>
+ struct remove_cv
+ {
+ typedef typename
+ remove_const<typename remove_volatile<_Tp>::type>::type type;
+ };
+
+ /// add_const
+ template<typename _Tp>
+ struct add_const
+ { typedef _Tp const type; };
+
+ /// add_volatile
+ template<typename _Tp>
+ struct add_volatile
+ { typedef _Tp volatile type; };
+
+ /// add_cv
+ template<typename _Tp>
+ struct add_cv
+ {
+ typedef typename
+ add_const<typename add_volatile<_Tp>::type>::type type;
+ };
+
+
+ // 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 = __and_<__not_<is_reference<_Tp>>,
+ __not_<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 = __and_<__not_<is_reference<_Tp>>,
+ __not_<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>
+ { };
+
+
+ // sign modifications.
+
+ // 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>
+ class __match_cv_qualifiers
+ {
+ 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; };
+
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128)
+ template<>
+ struct __make_unsigned<__int128>
+ { typedef unsigned __int128 __type; };
+#endif
+
+ // 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>
+ class __make_unsigned_selector;
+
+ template<typename _Tp>
+ class __make_unsigned_selector<_Tp, true, false>
+ {
+ 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>
+ class __make_unsigned_selector<_Tp, false, true>
+ {
+ // 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; };
+
+#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128)
+ template<>
+ struct __make_signed<unsigned __int128>
+ { typedef __int128 __type; };
+#endif
+
+ // 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>
+ class __make_signed_selector;
+
+ template<typename _Tp>
+ class __make_signed_selector<_Tp, true, false>
+ {
+ 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>
+ class __make_signed_selector<_Tp, false, true>
+ {
+ // 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>;
+
+
+ // array modifications.
+
+ /// remove_extent
+ template<typename _Tp>
+ struct remove_extent
+ { typedef _Tp type; };
+
+ template<typename _Tp, std::size_t _Size>
+ struct remove_extent<_Tp[_Size]>
+ { typedef _Tp type; };
+
+ template<typename _Tp>
+ struct remove_extent<_Tp[]>
+ { typedef _Tp type; };
+
+ /// remove_all_extents
+ template<typename _Tp>
+ struct remove_all_extents
+ { typedef _Tp type; };
+
+ template<typename _Tp, std::size_t _Size>
+ struct remove_all_extents<_Tp[_Size]>
+ { typedef typename remove_all_extents<_Tp>::type type; };
+
+ template<typename _Tp>
+ struct remove_all_extents<_Tp[]>
+ { typedef typename remove_all_extents<_Tp>::type type; };
+
+
+ // pointer modifications.
+
+ template<typename _Tp, typename>
+ struct __remove_pointer_helper
+ { typedef _Tp type; };
+
+ template<typename _Tp, typename _Up>
+ struct __remove_pointer_helper<_Tp, _Up*>
+ { typedef _Up type; };
+
+ /// remove_pointer
+ template<typename _Tp>
+ struct remove_pointer
+ : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
+ { };
+
+ /// add_pointer
+ template<typename _Tp>
+ struct add_pointer
+ { typedef typename remove_reference<_Tp>::type* type; };
+
+
+ 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;
+ };
+ };
+
+
+ // 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>
+ class decay
+ {
+ typedef typename remove_reference<_Tp>::type __remove_type;
+
+ public:
+ typedef typename __decay_selector<__remove_type>::__type type;
+ };
+
+ template<typename _Tp>
+ class reference_wrapper;
+
+ // Helper which adds a reference to a type when given a reference_wrapper
+ template<typename _Tp>
+ struct __strip_reference_wrapper
+ {
+ typedef _Tp __type;
+ };
+
+ template<typename _Tp>
+ struct __strip_reference_wrapper<reference_wrapper<_Tp> >
+ {
+ typedef _Tp& __type;
+ };
+
+ template<typename _Tp>
+ struct __strip_reference_wrapper<const reference_wrapper<_Tp> >
+ {
+ typedef _Tp& __type;
+ };
+
+ template<typename _Tp>
+ struct __decay_and_strip
+ {
+ typedef typename __strip_reference_wrapper<
+ typename decay<_Tp>::type>::__type __type;
+ };
+
+
+ // Primary template.
+ /// Define a member typedef @c type only if a boolean constant is true.
+ template<bool, typename _Tp = void>
+ struct enable_if
+ { };
+
+ // Partial specialization for true.
+ template<typename _Tp>
+ struct enable_if<true, _Tp>
+ { typedef _Tp type; };
+
+
+ // Primary template.
+ /// Define a member typedef @c type to one of two argument types.
+ 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; };
+
+
+ /// common_type
+ template<typename... _Tp>
+ struct common_type;
+
+ template<typename _Tp>
+ struct common_type<_Tp>
+ { typedef _Tp type; };
+
+ template<typename _Tp, typename _Up>
+ struct common_type<_Tp, _Up>
+ { typedef decltype(true ? declval<_Tp>() : declval<_Up>()) 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;
+ };
+
+ /// The underlying type of an enum.
+ template<typename _Tp>
+ struct underlying_type
+ {
+ typedef __underlying_type(_Tp) type;
+ };
+
+ template<typename _Tp>
+ struct __declval_protector
+ {
+ static const bool __stop = false;
+ static typename add_rvalue_reference<_Tp>::type __delegate();
+ };
+
+ template<typename _Tp>
+ inline typename add_rvalue_reference<_Tp>::type
+ declval() noexcept
+ {
+ static_assert(__declval_protector<_Tp>::__stop,
+ "declval() must not be used!");
+ return __declval_protector<_Tp>::__delegate();
+ }
+
+ /// result_of
+ template<typename _Signature>
+ class result_of;
+
+ template<typename _MemPtr, typename _Arg>
+ struct _Result_of_memobj;
+
+ template<typename _Res, typename _Class, typename _Arg>
+ struct _Result_of_memobj<_Res _Class::*, _Arg>
+ {
+ private:
+ typedef _Res _Class::* _Func;
+
+ template<typename _Tp>
+ static _Tp _S_get(const _Class&);
+ template<typename _Tp>
+ static decltype(*std::declval<_Tp>()) _S_get(...);
+
+ public:
+ typedef
+ decltype(_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>())
+ __type;
+ };
+
+ template<typename _MemPtr, typename _Arg, typename... _ArgTypes>
+ struct _Result_of_memfun;
+
+ template<typename _Res, typename _Class, typename _Arg, typename... _Args>
+ struct _Result_of_memfun<_Res _Class::*, _Arg, _Args...>
+ {
+ private:
+ typedef _Res _Class::* _Func;
+
+ template<typename _Tp>
+ static _Tp _S_get(const _Class&);
+ template<typename _Tp>
+ static decltype(*std::declval<_Tp>()) _S_get(...);
+
+ public:
+ typedef
+ decltype((_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>())
+ (std::declval<_Args>()...) )
+ __type;
+ };
+
+ template<bool, bool, typename _Functor, typename... _ArgTypes>
+ struct _Result_of_impl;
+
+ template<typename _Functor, typename... _ArgTypes>
+ struct _Result_of_impl<false, false, _Functor, _ArgTypes...>
+ {
+ typedef
+ decltype( std::declval<_Functor>()(std::declval<_ArgTypes>()...) )
+ __type;
+ };
+
+ template<typename _MemPtr, typename _Arg>
+ struct _Result_of_impl<true, false, _MemPtr, _Arg>
+ : _Result_of_memobj<typename remove_reference<_MemPtr>::type, _Arg>
+ {
+ typedef typename _Result_of_memobj<
+ typename remove_reference<_MemPtr>::type, _Arg>::__type
+ __type;
+ };
+
+ template<typename _MemPtr, typename _Arg, typename... _ArgTypes>
+ struct _Result_of_impl<false, true, _MemPtr, _Arg, _ArgTypes...>
+ : _Result_of_memfun<typename remove_reference<_MemPtr>::type, _Arg,
+ _ArgTypes...>
+ {
+ typedef typename _Result_of_memfun<
+ typename remove_reference<_MemPtr>::type, _Arg, _ArgTypes...>::__type
+ __type;
+ };
+
+ template<typename _Functor, typename... _ArgTypes>
+ struct result_of<_Functor(_ArgTypes...)>
+ : _Result_of_impl<is_member_object_pointer<
+ typename remove_reference<_Functor>::type >::value,
+ is_member_function_pointer<
+ typename remove_reference<_Functor>::type >::value,
+ _Functor, _ArgTypes...>
+ {
+ typedef typename _Result_of_impl<
+ is_member_object_pointer<
+ typename remove_reference<_Functor>::type >::value,
+ is_member_function_pointer<
+ typename remove_reference<_Functor>::type >::value,
+ _Functor, _ArgTypes...>::__type
+ type;
+ };
+
+ /**
+ * Use SFINAE to determine if the type _Tp has a publicly-accessible
+ * member type _NTYPE.
+ */
+#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
+ template<typename _Tp> \
+ class __has_##_NTYPE##_helper \
+ : __sfinae_types \
+ { \
+ template<typename _Up> \
+ struct _Wrap_type \
+ { }; \
+ \
+ template<typename _Up> \
+ static __one __test(_Wrap_type<typename _Up::_NTYPE>*); \
+ \
+ template<typename _Up> \
+ static __two __test(...); \
+ \
+ public: \
+ static constexpr bool value = sizeof(__test<_Tp>(0)) == 1; \
+ }; \
+ \
+ template<typename _Tp> \
+ struct __has_##_NTYPE \
+ : integral_constant<bool, __has_##_NTYPE##_helper \
+ <typename remove_cv<_Tp>::type>::value> \
+ { };
+
+ /// @} group metaprogramming
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+#endif // _GLIBCXX_TYPE_TRAITS
projects / cross.git / blobdiff