We've had __has_final built-in for a good while.
the std library component is_final was added to C++14 - which is now good.
I noticed while looking at the latest SD-6 draft.
So here is a simple patch that builds and passes clean on x86_64-linux.
OK?
2014-09-14 Edward Smith-Rowland <[email protected]>
* include/std/type_traits: Add is_final<> type trait for C++14.
* testsuite/util/testsuite_tr1.h: Add
* testsuite/20_util/is_final/requirements/
explicit_instantiation.cc: New.
* testsuite/20_util/is_final/requirements/typedefs.cc: New.
* testsuite/20_util/is_final/value.cc: New.
* testsuite/20_util/declval/requirements/1_neg.cc: Adjust.
* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Adjust.
* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc: Adjust.
Index: include/std/type_traits
===================================================================
--- include/std/type_traits (revision 215247)
+++ include/std/type_traits (working copy)
@@ -634,6 +634,15 @@
: public integral_constant<bool, __is_polymorphic(_Tp)>
{ };
+#if __cplusplus >= 201402L
+#define __cpp_lib_is_final 201402L
+ /// is_final
+ template<typename _Tp>
+ struct is_final
+ : public integral_constant<bool, __is_final(_Tp)>
+ { };
+#endif
+
/// is_abstract
template<typename _Tp>
struct is_abstract
Index: testsuite/20_util/declval/requirements/1_neg.cc
===================================================================
--- testsuite/20_util/declval/requirements/1_neg.cc (revision 215247)
+++ testsuite/20_util/declval/requirements/1_neg.cc (working copy)
@@ -19,7 +19,7 @@
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
-// { dg-error "static assertion failed" "" { target *-*-* } 2082 }
+// { dg-error "static assertion failed" "" { target *-*-* } 2091 }
#include <utility>
Index: testsuite/20_util/is_final/requirements/explicit_instantiation.cc
===================================================================
--- testsuite/20_util/is_final/requirements/explicit_instantiation.cc
(revision 0)
+++ testsuite/20_util/is_final/requirements/explicit_instantiation.cc
(working copy)
@@ -0,0 +1,29 @@
+// { 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 copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// NB: This file is for testing type_traits with NO OTHER INCLUDES.
+
+#include <type_traits>
+
+namespace std
+{
+ typedef short test_type;
+ template struct is_final<test_type>;
+}
Index: testsuite/20_util/is_final/requirements/typedefs.cc
===================================================================
--- testsuite/20_util/is_final/requirements/typedefs.cc (revision 0)
+++ testsuite/20_util/is_final/requirements/typedefs.cc (working copy)
@@ -0,0 +1,34 @@
+// { 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 copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+//
+// NB: This file is for testing type_traits with NO OTHER INCLUDES.
+
+#include <type_traits>
+
+void test01()
+{
+ // Check for required typedefs
+ typedef std::is_final<int> test_type;
+ typedef test_type::value_type value_type;
+ typedef test_type::type type;
+ typedef test_type::type::value_type type_value_type;
+ typedef test_type::type::type type_type;
+}
Index: testsuite/20_util/is_final/value.cc
===================================================================
--- testsuite/20_util/is_final/value.cc (revision 0)
+++ testsuite/20_util/is_final/value.cc (working copy)
@@ -0,0 +1,35 @@
+// { dg-options "-std=gnu++14" }
+// { dg-do compile }
+
+// Copyright (C) 2011-2014 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 copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <type_traits>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+ using std::is_final;
+ using namespace __gnu_test;
+
+ // Positive test.
+ static_assert(test_category<is_final, FinalType>(true), "");
+
+ // Negative tests.
+ static_assert(test_category<is_final, ClassType>(false), "");
+ static_assert(test_category<is_final, DerivedType>(false), "");
+}
Index: testsuite/20_util/make_signed/requirements/typedefs_neg.cc
===================================================================
--- testsuite/20_util/make_signed/requirements/typedefs_neg.cc (revision
215247)
+++ testsuite/20_util/make_signed/requirements/typedefs_neg.cc (working copy)
@@ -48,5 +48,5 @@
// { dg-error "required from here" "" { target *-*-* } 40 }
// { dg-error "required from here" "" { target *-*-* } 42 }
-// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1747 }
-// { dg-error "declaration of" "" { target *-*-* } 1711 }
+// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1756 }
+// { dg-error "declaration of" "" { target *-*-* } 1720 }
Index: testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
===================================================================
--- testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
(revision 215247)
+++ testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
(working copy)
@@ -48,5 +48,5 @@
// { dg-error "required from here" "" { target *-*-* } 40 }
// { dg-error "required from here" "" { target *-*-* } 42 }
-// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1650 }
-// { dg-error "declaration of" "" { target *-*-* } 1614 }
+// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1659 }
+// { dg-error "declaration of" "" { target *-*-* } 1623 }
Index: testsuite/util/testsuite_tr1.h
===================================================================
--- testsuite/util/testsuite_tr1.h (revision 215247)
+++ testsuite/util/testsuite_tr1.h (working copy)
@@ -100,6 +100,10 @@
class DerivedType : public ClassType { };
+#if __cplusplus >= 201103L
+ class FinalType final : public DerivedType { };
+#endif
+
enum EnumType { e0 };
struct ConvType
