[libstdc++] Implement the Library Fundamentals v1 variable templates for type traits

diff --git a/libstdc++-v3/include/Makefile.am b/libstdc++-v3/include/Makefile.am
index e3aed84..1ee8ddc 100644
--- a/libstdc++-v3/include/Makefile.am
+++ b/libstdc++-v3/include/Makefile.am
@@ -643,7 +643,8 @@  experimental_headers = \
 	${experimental_srcdir}/optional \
 	${experimental_srcdir}/string_view \
 	${experimental_srcdir}/string_view.tcc \
-	${experimental_srcdir}/tuple
+	${experimental_srcdir}/tuple \
+	${experimental_srcdir}/type_traits
 
 # This is the common subset of C++ files that all three "C" header models use.
 c_base_srcdir = $(C_INCLUDE_DIR)
diff --git a/libstdc++-v3/include/experimental/type_traits b/libstdc++-v3/include/experimental/type_traits
new file mode 100644
index 0000000..415b76c
--- /dev/null
+++ b/libstdc++-v3/include/experimental/type_traits
@@ -0,0 +1,206 @@ 
+// Variable Templates For Type Traits -*- C++ -*-
+
+// Copyright (C) 2014 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 experimental/type_traits
+ *  This is a Standard C++ Library header.
+ */
+
+//
+// N3932 Variable Templates For Type Traits (Revision 1)
+//
+
+#ifndef _GLIBCXX_EXPERIMENTAL_TYPE_TRAITS
+#define _GLIBCXX_EXPERIMENTAL_TYPE_TRAITS 1
+
+#pragma GCC system_header
+
+#if __cplusplus <= 201103L
+# include <bits/c++14_warning.h>
+#else
+
+#include <type_traits>
+
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+namespace experimental
+{
+inline namespace fundamentals_v1
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+// See C++14 §20.10.4.1, primary type categories
+template <class T> constexpr bool is_void_v =
+  is_void<T>::value;
+template <class T> constexpr bool is_null_pointer_v =
+  is_null_pointer<T>::value;
+template <class T> constexpr bool is_integral_v =
+  is_integral<T>::value;
+template <class T> constexpr bool is_floating_point_v =
+  is_floating_point<T>::value;
+template <class T> constexpr bool is_array_v =
+  is_array<T>::value;
+template <class T> constexpr bool is_pointer_v =
+  is_pointer<T>::value;
+template <class T> constexpr bool is_lvalue_reference_v =
+  is_lvalue_reference<T>::value;
+template <class T> constexpr bool is_rvalue_reference_v =
+  is_rvalue_reference<T>::value;
+template <class T> constexpr bool is_member_object_pointer_v =
+  is_member_object_pointer<T>::value;
+template <class T> constexpr bool is_member_function_pointer_v =
+  is_member_function_pointer<T>::value;
+template <class T> constexpr bool is_enum_v =
+  is_enum<T>::value;
+template <class T> constexpr bool is_union_v =
+  is_union<T>::value;
+template <class T> constexpr bool is_class_v =
+  is_class<T>::value;
+template <class T> constexpr bool is_function_v =
+  is_function<T>::value;
+
+// See C++14 §20.10.4.2, composite type categories
+template <class T> constexpr bool is_reference_v =
+  is_reference<T>::value;
+template <class T> constexpr bool is_arithmetic_v =
+  is_arithmetic<T>::value;
+template <class T> constexpr bool is_fundamental_v =
+  is_fundamental<T>::value;
+template <class T> constexpr bool is_object_v =
+  is_object<T>::value;
+template <class T> constexpr bool is_scalar_v =
+  is_scalar<T>::value;
+template <class T> constexpr bool is_compound_v =
+  is_compound<T>::value;
+template <class T> constexpr bool is_member_pointer_v =
+  is_member_pointer<T>::value;
+
+// See C++14 §20.10.4.3, type properties
+template <class T> constexpr bool is_const_v =
+  is_const<T>::value;
+template <class T> constexpr bool is_volatile_v =
+  is_volatile<T>::value;
+template <class T> constexpr bool is_trivial_v =
+  is_trivial<T>::value;
+template <class T> constexpr bool is_trivially_copyable_v =
+  is_trivially_copyable<T>::value;
+template <class T> constexpr bool is_standard_layout_v =
+  is_standard_layout<T>::value;
+template <class T> constexpr bool is_pod_v =
+  is_pod<T>::value;
+template <class T> constexpr bool is_literal_type_v =
+  is_literal_type<T>::value;
+template <class T> constexpr bool is_empty_v =
+  is_empty<T>::value;
+template <class T> constexpr bool is_polymorphic_v =
+  is_polymorphic<T>::value;
+template <class T> constexpr bool is_abstract_v =
+  is_abstract<T>::value;
+template <class T> constexpr bool is_final_v =
+  is_final<T>::value;
+template <class T> constexpr bool is_signed_v =
+  is_signed<T>::value;
+template <class T> constexpr bool is_unsigned_v =
+  is_unsigned<T>::value;
+template <class T, class... Args> constexpr bool is_constructible_v =
+  is_constructible<T, Args...>::value;
+template <class T> constexpr bool is_default_constructible_v =
+  is_default_constructible<T>::value;
+template <class T> constexpr bool is_copy_constructible_v =
+  is_copy_constructible<T>::value;
+template <class T> constexpr bool is_move_constructible_v =
+  is_move_constructible<T>::value;
+template <class T, class U> constexpr bool is_assignable_v =
+  is_assignable<T, U>::value;
+template <class T> constexpr bool is_copy_assignable_v =
+  is_copy_assignable<T>::value;
+template <class T> constexpr bool is_move_assignable_v =
+  is_move_assignable<T>::value;
+template <class T> constexpr bool is_destructible_v =
+  is_destructible<T>::value;
+template <class T, class... Args> constexpr bool is_trivially_constructible_v =
+  is_trivially_constructible<T, Args...>::value;
+template <class T> constexpr bool is_trivially_default_constructible_v =
+  is_trivially_default_constructible<T>::value;
+template <class T> constexpr bool is_trivially_copy_constructible_v =
+  is_trivially_copy_constructible<T>::value;
+template <class T> constexpr bool is_trivially_move_constructible_v =
+  is_trivially_move_constructible<T>::value;
+template <class T, class U> constexpr bool is_trivially_assignable_v =
+  is_trivially_assignable<T, U>::value;
+template <class T> constexpr bool is_trivially_copy_assignable_v =
+  is_trivially_copy_assignable<T>::value;
+template <class T> constexpr bool is_trivially_move_assignable_v =
+  is_trivially_move_assignable<T>::value;
+template <class T> constexpr bool is_trivially_destructible_v =
+  is_trivially_destructible<T>::value;
+template <class T, class... Args> constexpr bool is_nothrow_constructible_v =
+  is_nothrow_constructible<T, Args...>::value;
+template <class T> constexpr bool is_nothrow_default_constructible_v =
+  is_nothrow_default_constructible<T>::value;
+template <class T> constexpr bool is_nothrow_copy_constructible_v =
+  is_nothrow_copy_constructible<T>::value;
+template <class T> constexpr bool is_nothrow_move_constructible_v =
+  is_nothrow_move_constructible<T>::value;
+template <class T, class U> constexpr bool is_nothrow_assignable_v =
+  is_nothrow_assignable<T, U>::value;
+template <class T> constexpr bool is_nothrow_copy_assignable_v =
+  is_nothrow_copy_assignable<T>::value;
+template <class T> constexpr bool is_nothrow_move_assignable_v =
+  is_nothrow_move_assignable<T>::value;
+template <class T> constexpr bool is_nothrow_destructible_v =
+  is_nothrow_destructible<T>::value;
+template <class T> constexpr bool has_virtual_destructor_v =
+  has_virtual_destructor<T>::value;
+
+// See C++14 §20.10.5, type property queries
+template <class T> constexpr size_t alignment_of_v =
+  alignment_of<T>::value;
+template <class T> constexpr size_t rank_v =
+  rank<T>::value;
+template <class T, unsigned I = 0> constexpr size_t extent_v =
+  extent<T, I>::value;
+
+// See C++14 §20.10.6, type relations
+template <class T, class U> constexpr bool is_same_v =
+  is_same<T, U>::value;
+template <class Base, class Derived> constexpr bool is_base_of_v =
+  is_base_of<Base, Derived>::value;
+template <class From, class To> constexpr bool is_convertible_v =
+  is_convertible<From, To>::value;
+
+
+  // 3.3.2, Other type transformations
+  // invocation_type (still unimplemented)
+  // raw_invocation_type (still unimplemented)
+  // invocation_type_t (still unimplemented)
+  // raw_invocation_type_t (still unimplemented)
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace fundamentals_v1
+} // namespace experimental
+} // namespace std
+
+#endif // __cplusplus <= 201103L
+
+#endif // _GLIBCXX_EXPERIMENTAL_TYPE_TRAITS
diff --git a/libstdc++-v3/testsuite/experimental/type_traits/value.cc b/libstdc++-v3/testsuite/experimental/type_traits/value.cc
new file mode 100644
index 0000000..85b8832
--- /dev/null
+++ b/libstdc++-v3/testsuite/experimental/type_traits/value.cc
@@ -0,0 +1,322 @@ 
+// { dg-options "-std=gnu++14" }
+// { dg-do compile }
+
+// Copyright (C) 2014 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.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <experimental/type_traits>
+
+using namespace std;
+using namespace std::experimental;
+
+// These tests are rather simple, the front-end tests already test
+// variable templates, and the library tests for the underlying
+// traits are more elaborate. These are just simple sanity tests.
+
+static_assert(is_void_v<void> && is_void<void>::value, "");
+static_assert(!is_void_v<int> && !is_void<int>::value, "");
+
+static_assert(is_null_pointer_v<nullptr_t>
+	      && is_null_pointer<nullptr_t>::value, "");
+static_assert(!is_null_pointer_v<void*>
+	      && !is_null_pointer<void*>::value, "");
+
+static_assert(is_integral_v<int> && is_integral<int>::value, "");
+static_assert(!is_integral_v<int*> && !is_integral<int*>::value, "");
+
+static_assert(is_floating_point_v<float>
+	      && is_floating_point<float>::value, "");
+static_assert(!is_floating_point_v<int>
+	      && !is_floating_point<int>::value, "");
+
+static_assert(is_array_v<char[42]> && is_array<char[42]>::value, "");
+static_assert(!is_array_v<char*> && !is_array<char*>::value, "");
+
+static_assert(is_pointer_v<int*> && is_pointer<int*>::value, "");
+static_assert(!is_pointer_v<int> && !is_pointer<int>::value, "");
+
+static_assert(is_lvalue_reference_v<int&>
+	      && is_lvalue_reference<int&>::value, "");
+static_assert(!is_lvalue_reference_v<int>
+	      && !is_lvalue_reference<int>::value, "");
+
+static_assert(is_rvalue_reference_v<int&&>
+	      && is_rvalue_reference<int&&>::value, "");
+static_assert(!is_rvalue_reference_v<int>
+	      && !is_rvalue_reference<int>::value, "");
+
+struct Dummy final {};
+
+static_assert(is_member_object_pointer_v<int (Dummy::*)>
+	      && is_member_object_pointer<int (Dummy::*)>::value, "");
+static_assert(!is_member_object_pointer_v<void*>
+	      && !is_member_object_pointer<void*>::value, "");
+
+static_assert(is_member_function_pointer_v<int (Dummy::*)()>
+	      && is_member_function_pointer<int (Dummy::*)()>::value, "");
+static_assert(!is_member_function_pointer_v<void*>
+	      && !is_member_function_pointer<void*>::value, "");
+
+enum Dummy2 {};
+
+static_assert(is_enum_v<Dummy2> && is_enum<Dummy2>::value, "");
+static_assert(!is_enum_v<int> && !is_enum<int>::value, "");
+
+union Dummy3;
+
+static_assert(is_union_v<Dummy3> && is_union<Dummy3>::value, "");
+static_assert(!is_union_v<int> && !is_union<int>::value, "");
+
+static_assert(is_class_v<Dummy> && is_class<Dummy>::value, "");
+static_assert(!is_class_v<int> && !is_class<int>::value, "");
+
+static_assert(is_function_v<void()> && is_function<void()>::value, "");
+static_assert(!is_function_v<void(*)()> && !is_function<void(*)()>::value, "");
+
+static_assert(is_reference_v<int&> && is_reference<int&>::value, "");
+static_assert(!is_reference_v<int> && !is_reference<int>::value, "");
+
+static_assert(is_arithmetic_v<int> && is_arithmetic<int>::value, "");
+static_assert(!is_arithmetic_v<void*> && !is_arithmetic<void*>::value, "");
+
+static_assert(is_fundamental_v<int> && is_fundamental<int>::value, "");
+static_assert(!is_fundamental_v<Dummy> && !is_fundamental<Dummy>::value, "");
+
+static_assert(is_object_v<int> && is_object<int>::value, "");
+static_assert(!is_object_v<int&> && !is_object<int&>::value, "");
+
+static_assert(is_scalar_v<int> && is_scalar<int>::value, "");
+static_assert(!is_scalar_v<int&> && !is_scalar<int&>::value, "");
+
+static_assert(is_compound_v<Dummy> && is_compound<Dummy>::value, "");
+static_assert(!is_compound_v<int> && !is_compound<int>::value, "");
+
+static_assert(is_member_pointer_v<int (Dummy::*)>
+	      && is_member_pointer<int (Dummy::*)>::value, "");
+static_assert(!is_member_pointer_v<void*>
+	      && !is_member_pointer<void*>::value, "");
+
+static_assert(is_const_v<const int> && is_const<const int>::value, "");
+static_assert(!is_const_v<int> && !is_const<int>::value, "");
+
+static_assert(is_volatile_v<volatile int>
+	      && is_volatile<volatile int>::value, "");
+static_assert(!is_volatile_v<int> && !is_volatile<int>::value, "");
+
+struct NType
+{
+  NType(int);
+  ~NType();
+  int i;
+private:
+  NType(const NType&);
+  NType& operator=(const NType&);
+  int i2;
+};
+
+static_assert(is_trivial_v<int> && is_trivial<int>::value, "");
+static_assert(!is_trivial_v<NType> && !is_trivial<NType>::value, "");
+
+static_assert(is_trivially_copyable_v<int>
+	      && is_trivially_copyable<int>::value, "");
+static_assert(!is_trivially_copyable_v<NType>
+	      && !is_trivially_copyable<NType>::value, "");
+
+static_assert(is_standard_layout_v<int>
+	      && is_standard_layout<int>::value, "");
+static_assert(!is_standard_layout_v<NType>
+	      && !is_standard_layout<NType>::value, "");
+
+static_assert(is_pod_v<int>
+	      && is_pod<int>::value, "");
+static_assert(!is_pod_v<NType>
+	      && !is_pod<NType>::value, "");
+
+static_assert(is_literal_type_v<int>
+	      && is_literal_type<int>::value, "");
+static_assert(!is_literal_type_v<NType>
+	      && !is_literal_type<NType>::value, "");
+
+static_assert(is_empty_v<Dummy>
+	      && is_empty<Dummy>::value, "");
+static_assert(!is_empty_v<NType>
+	      && !is_empty<NType>::value, "");
+
+struct Abstract {protected: virtual ~Abstract() = 0;};
+struct Poly : Abstract {virtual ~Poly();};
+
+static_assert(is_polymorphic_v<Poly>
+	      && is_polymorphic<Poly>::value, "");
+static_assert(!is_polymorphic_v<Dummy>
+	      && !is_polymorphic<Dummy>::value, "");
+
+
+
+static_assert(is_abstract_v<Abstract>
+	      && is_abstract<Abstract>::value, "");
+static_assert(!is_abstract_v<Dummy>
+	      && !is_abstract<Dummy>::value, "");
+
+static_assert(is_final_v<Dummy>
+	      && is_final<Dummy>::value, "");
+static_assert(!is_final_v<Abstract>
+	      && !is_final<Abstract>::value, "");
+
+static_assert(is_signed_v<int> && is_signed<int>::value, "");
+static_assert(!is_signed_v<unsigned int>
+	      && !is_signed<unsigned int>::value, "");
+
+static_assert(is_constructible_v<int, int>
+	      && is_constructible<int, int>::value, "");
+static_assert(!is_constructible_v<int, void*>
+	      && !is_constructible<int, void*>::value, "");
+
+static_assert(is_default_constructible_v<int>
+	      && is_default_constructible<int>::value, "");
+static_assert(!is_default_constructible_v<NType>
+	      && !is_default_constructible<NType>::value, "");
+
+static_assert(is_copy_constructible_v<int>
+	      && is_copy_constructible<int>::value, "");
+static_assert(!is_copy_constructible_v<NType>
+	      && !is_copy_constructible<NType>::value, "");
+
+static_assert(is_move_constructible_v<int>
+	      && is_copy_constructible<int>::value, "");
+static_assert(!is_move_constructible_v<NType>
+	      && !is_copy_constructible<NType>::value, "");
+
+static_assert(is_assignable_v<int&, int>
+	      && is_assignable<int&, int>::value, "");
+static_assert(!is_assignable_v<int, int>
+	      && !is_assignable<int, int>::value, "");
+
+static_assert(is_copy_assignable_v<int>
+	      && is_copy_assignable<int>::value, "");
+static_assert(!is_copy_assignable_v<NType>
+	      && !is_copy_assignable<NType>::value, "");
+
+static_assert(is_move_assignable_v<int>
+	      && is_move_assignable<int>::value, "");
+static_assert(!is_move_assignable_v<NType>
+	      && !is_move_assignable<NType>::value, "");
+
+static_assert(is_destructible_v<int>
+	      && is_destructible<int>::value, "");
+static_assert(!is_destructible_v<Abstract>
+	      && !is_destructible<Abstract>::value, "");
+
+static_assert(is_trivially_constructible_v<int, int>
+	      && is_trivially_constructible<int, int>::value, "");
+static_assert(!is_trivially_constructible_v<NType, NType>
+	      && !is_trivially_constructible<NType, NType>::value, "");
+
+static_assert(is_trivially_default_constructible_v<int>
+	      && is_trivially_default_constructible<int>::value, "");
+static_assert(!is_trivially_default_constructible_v<NType>
+	      && !is_trivially_default_constructible<NType>::value, "");
+
+static_assert(is_trivially_copy_constructible_v<int>
+	      && is_trivially_copy_constructible<int>::value, "");
+static_assert(!is_trivially_copy_constructible_v<NType>
+	      && !is_trivially_copy_constructible<NType>::value, "");
+
+static_assert(is_trivially_move_constructible_v<int>
+	      && is_trivially_move_constructible<int>::value, "");
+static_assert(!is_trivially_move_constructible_v<NType>
+	      && !is_trivially_move_constructible<NType>::value, "");
+
+static_assert(is_trivially_assignable_v<int&, int>
+	      && is_trivially_assignable<int&, int>::value, "");
+static_assert(!is_trivially_assignable_v<NType, NType>
+	      && !is_trivially_assignable<NType, NType>::value, "");
+
+static_assert(is_trivially_copy_assignable_v<int>
+	      && is_trivially_copy_assignable<int>::value, "");
+static_assert(!is_trivially_copy_assignable_v<NType>
+	      && !is_trivially_copy_assignable<NType>::value, "");
+
+static_assert(is_trivially_move_assignable_v<int>
+	      && is_trivially_move_assignable<int>::value, "");
+static_assert(!is_trivially_move_assignable_v<NType>
+	      && !is_trivially_move_assignable<NType>::value, "");
+
+static_assert(is_trivially_destructible_v<int>
+	      && is_trivially_destructible<int>::value, "");
+static_assert(!is_trivially_destructible_v<Abstract>
+	      && !is_trivially_destructible<Abstract>::value, "");
+
+static_assert(is_nothrow_constructible_v<int, int>
+	      && is_nothrow_constructible<int, int>::value, "");
+static_assert(!is_nothrow_constructible_v<NType, NType>
+	      && !is_nothrow_constructible<NType, NType>::value, "");
+
+static_assert(is_nothrow_default_constructible_v<int>
+	      && is_nothrow_default_constructible<int>::value, "");
+static_assert(!is_nothrow_default_constructible_v<NType>
+	      && !is_nothrow_default_constructible<NType>::value, "");
+
+static_assert(is_nothrow_copy_constructible_v<int>
+	      && is_nothrow_copy_constructible<int>::value, "");
+static_assert(!is_nothrow_copy_constructible_v<NType>
+	      && !is_nothrow_copy_constructible<NType>::value, "");
+
+static_assert(is_nothrow_move_constructible_v<int>
+	      && is_nothrow_move_constructible<int>::value, "");
+static_assert(!is_nothrow_move_constructible_v<NType>
+	      && !is_nothrow_move_constructible<NType>::value, "");
+
+static_assert(is_nothrow_assignable_v<int&, int>
+	      && is_nothrow_assignable<int&, int>::value, "");
+static_assert(!is_nothrow_assignable_v<NType, NType>
+	      && !is_nothrow_assignable<NType, NType>::value, "");
+
+static_assert(is_nothrow_copy_assignable_v<int>
+	      && is_nothrow_copy_assignable<int>::value, "");
+static_assert(!is_nothrow_copy_assignable_v<NType>
+	      && !is_nothrow_copy_assignable<NType>::value, "");
+
+static_assert(is_nothrow_move_assignable_v<int>
+	      && is_nothrow_move_assignable<int>::value, "");
+static_assert(!is_nothrow_move_assignable_v<NType>
+	      && !is_nothrow_move_assignable<NType>::value, "");
+
+static_assert(has_virtual_destructor_v<Abstract>
+	      && has_virtual_destructor<Abstract>::value, "");
+static_assert(!has_virtual_destructor_v<NType>
+	      && !has_virtual_destructor<NType>::value, "");
+
+static_assert(alignment_of_v<int> == alignof(int)
+	      && alignment_of<int>::value == alignof(int) , "");
+
+static_assert(rank_v<int[1][1]> == rank<int[1][1]>::value, "");
+
+static_assert(extent_v<int[1][2], 1> == 2
+	      && extent<int[1][2], 1>::value == 2, "");
+
+static_assert(is_same_v<int, int> && is_same<int, int>::value, "");
+static_assert(!is_same_v<int, char> && !is_same<int, char>::value, "");
+
+static_assert(is_base_of_v<Abstract, Poly>
+	      && is_base_of<Abstract, Poly>::value, "");
+static_assert(!is_base_of_v<Abstract, NType>
+	      && !is_base_of<Abstract, NType>::value, "");
+
+static_assert(is_convertible_v<int&, const int&>
+	      && is_convertible<int&, const int&>::value, "");
+static_assert(!is_convertible_v<const int&, int&>
+	      && !is_convertible<const int&, int&>::value, "");