Hi,
this adds the trait per LWG 2247 [Ready]. For the time being I'm keeping
__is_nullptr_t, which maybe somebody was using as an extension...
Tested x86_64-linux.
Thanks,
Paolo.
/////////////////////////////
2013-05-02 Paolo Carlini <paolo.carl...@oracle.com>
* include/std/type_traits (is_null_pointer): Add.
(__is_nullptr_t): Implement in terms of the latter.
(is_fundamental, is_scalar): Adjust.
* testsuite/20_util/is_null_pointer/requirements/
explicit_instantiation.cc: New.
* testsuite/20_util/is_null_pointer/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/is_null_pointer/value.cc: Likewise.
* testsuite/20_util/declval/requirements/1_neg.cc: Adjust dg-error
line number.
* testsuite/20_util/make_signed/requirements/typedefs_neg.cc:
Likewise.
* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
Likewise.
Index: include/std/type_traits
===================================================================
--- include/std/type_traits (revision 198511)
+++ include/std/type_traits (working copy)
@@ -402,17 +402,23 @@
: public true_type { };
template<typename>
- struct __is_nullptr_t_helper
+ struct __is_null_pointer_helper
: public false_type { };
template<>
- struct __is_nullptr_t_helper<std::nullptr_t>
+ struct __is_null_pointer_helper<std::nullptr_t>
: public true_type { };
+ // is_null_pointer (LWG 2247).
+ template<typename _Tp>
+ struct is_null_pointer
+ : public __is_null_pointer_helper<typename remove_cv<_Tp>::type>::type
+ { };
+
// __is_nullptr_t (extension).
template<typename _Tp>
struct __is_nullptr_t
- : public __is_nullptr_t_helper<typename remove_cv<_Tp>::type>::type
+ : public is_null_pointer<_Tp>
{ };
// Composite type categories.
@@ -433,7 +439,8 @@
/// is_fundamental
template<typename _Tp>
struct is_fundamental
- : public __or_<is_arithmetic<_Tp>, is_void<_Tp>, __is_nullptr_t<_Tp>>::type
+ : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
+ is_null_pointer<_Tp>>::type
{ };
/// is_object
@@ -450,7 +457,7 @@
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_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
{ };
/// is_compound
Index: testsuite/20_util/declval/requirements/1_neg.cc
===================================================================
--- testsuite/20_util/declval/requirements/1_neg.cc (revision 198511)
+++ 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 *-*-* } 1852 }
+// { dg-error "static assertion failed" "" { target *-*-* } 1859 }
#include <utility>
Index: testsuite/20_util/is_null_pointer/requirements/explicit_instantiation.cc
===================================================================
--- testsuite/20_util/is_null_pointer/requirements/explicit_instantiation.cc
(revision 0)
+++ testsuite/20_util/is_null_pointer/requirements/explicit_instantiation.cc
(working copy)
@@ -0,0 +1,30 @@
+// { dg-options "-std=gnu++11" }
+// { dg-do compile }
+// 2013-05-02 Paolo Carlini <paolo.carl...@oracle.com>
+
+// Copyright (C) 2013 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_null_pointer<test_type>;
+}
Index: testsuite/20_util/is_null_pointer/requirements/typedefs.cc
===================================================================
--- testsuite/20_util/is_null_pointer/requirements/typedefs.cc (revision 0)
+++ testsuite/20_util/is_null_pointer/requirements/typedefs.cc (working copy)
@@ -0,0 +1,36 @@
+// { dg-options "-std=gnu++11" }
+// 2013-05-02 Paolo Carlini <paolo.carl...@oracle.com>
+//
+// Copyright (C) 2013 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>
+
+// { dg-do compile }
+
+void test01()
+{
+ // Check for required typedefs
+ typedef std::is_null_pointer<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_null_pointer/value.cc
===================================================================
--- testsuite/20_util/is_null_pointer/value.cc (revision 0)
+++ testsuite/20_util/is_null_pointer/value.cc (working copy)
@@ -0,0 +1,60 @@
+// { dg-options "-std=gnu++11" }
+// 2013-05-02 Paolo Carlini <pcarl...@suse.de>
+//
+// Copyright (C) 2013 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_hooks.h>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+ using std::is_null_pointer;
+ using namespace __gnu_test;
+
+ VERIFY( (test_category<is_null_pointer, std::nullptr_t>(true)) );
+
+ VERIFY( (test_category<is_null_pointer, int>(false)) );
+ VERIFY( (test_category<is_null_pointer, float>(false)) );
+ VERIFY( (test_category<is_null_pointer, EnumType>(false)) );
+ VERIFY( (test_category<is_null_pointer, int*>(false)) );
+ VERIFY( (test_category<is_null_pointer, int(*)(int)>(false)) );
+ VERIFY( (test_category<is_null_pointer, int (ClassType::*)>(false)) );
+ VERIFY( (test_category<is_null_pointer, int (ClassType::*) (int)>(false)) );
+ VERIFY( (test_category<is_null_pointer, int[2]>(false)) );
+ VERIFY( (test_category<is_null_pointer, float[][3]>(false)) );
+ VERIFY( (test_category<is_null_pointer, EnumType[2][3][4]>(false)) );
+ VERIFY( (test_category<is_null_pointer, int*[3]>(false)) );
+ VERIFY( (test_category<is_null_pointer, int(*[][2])(int)>(false)) );
+ VERIFY( (test_category<is_null_pointer, int (ClassType::*[2][3])>(false)) );
+ VERIFY( (test_category<is_null_pointer,
+ int (ClassType::*[][2][3]) (int)>(false)) );
+ VERIFY( (test_category<is_null_pointer, ClassType>(false)) );
+ VERIFY( (test_category<is_null_pointer, PODType>(false)) );
+ VERIFY( (test_category<is_null_pointer, void>(false)) );
+ VERIFY( (test_category<is_null_pointer, NType>(false)) );
+ VERIFY( (test_category<is_null_pointer, TType>(false)) );
+ VERIFY( (test_category<is_null_pointer, SLType>(false)) );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
Index: testsuite/20_util/make_signed/requirements/typedefs_neg.cc
===================================================================
--- testsuite/20_util/make_signed/requirements/typedefs_neg.cc (revision
198511)
+++ 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 *-*-* } 1594 }
-// { dg-error "declaration of" "" { target *-*-* } 1558 }
+// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1601 }
+// { dg-error "declaration of" "" { target *-*-* } 1565 }
Index: testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
===================================================================
--- testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc
(revision 198511)
+++ 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 *-*-* } 1512 }
-// { dg-error "declaration of" "" { target *-*-* } 1476 }
+// { dg-error "invalid use of incomplete type" "" { target *-*-* } 1519 }
+// { dg-error "declaration of" "" { target *-*-* } 1483 }
