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[v3] tr1/type_traits is_function


Hi,

tested x86-linux, committed.

Paolo.

///////////////
2004-12-16  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/type_traits: Implement is_function.
	(struct __sfinae_types, struct __is_function_helper): New.
	* testsuite/tr1/4_metaprogramming/composite_type_traits/
	is_object/is_object.cc: New.
	* testsuite/tr1/4_metaprogramming/composite_type_traits/
	is_object/typedefs.cc: Likewise.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_function/is_function.cc: Likewise.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_function/typedefs.cc: Likewise.
diff -urN libstdc++-v3-orig/include/tr1/type_traits libstdc++-v3/include/tr1/type_traits
--- libstdc++-v3-orig/include/tr1/type_traits	2004-12-13 16:01:02.000000000 +0100
+++ libstdc++-v3/include/tr1/type_traits	2004-12-16 12:14:35.000000000 +0100
@@ -28,21 +28,17 @@
 #include <bits/c++config.h>
 #include <cstddef>
 
-//namespace std::tr1
+// namespace std::tr1
 namespace std
 {
 namespace tr1
 {
-  /// @brief  helper classes [4.3].
-  template<typename _Tp, _Tp __v>
-    struct integral_constant
-    {
-      static const _Tp                      value = __v;
-      typedef _Tp                           value_type;
-      typedef integral_constant<_Tp, __v>   type;
-    };
-  typedef integral_constant<bool, true>     true_type;
-  typedef integral_constant<bool, false>    false_type;
+  // For use in is_function and elsewhere.
+  struct __sfinae_types
+  {
+    typedef char __one;
+    typedef struct { char __arr[2]; } __two;
+  };
 
 #define _DEFINE_SPEC_HELPER(_Header, _Spec)                      \
   template _Header                                               \
@@ -55,6 +51,17 @@
   _DEFINE_SPEC_HELPER(_Header, _Trait<_Type volatile>)           \
   _DEFINE_SPEC_HELPER(_Header, _Trait<_Type const volatile>)
 
+  /// @brief  helper classes [4.3].
+  template<typename _Tp, _Tp __v>
+    struct integral_constant
+    {
+      static const _Tp                      value = __v;
+      typedef _Tp                           value_type;
+      typedef integral_constant<_Tp, __v>   type;
+    };
+  typedef integral_constant<bool, true>     true_type;
+  typedef integral_constant<bool, false>    false_type;
+
   /// @brief  primary type categories [4.5.1].
   template<typename>
     struct is_void
@@ -126,9 +133,30 @@
   
   template<typename _Tp>
     struct is_class;
+
+  template<typename _Tp>
+    struct __is_function_helper
+    : public __sfinae_types
+    {
+    private:
+      template<typename>
+        static __one
+        __test(...);
+
+      template<typename _Up>
+        static __two
+        __test(_Up (*) [1]);
+    
+    public:
+      static const bool __value = sizeof(__test<_Tp>(0)) == 1;
+    };
   
   template<typename _Tp>
-    struct is_function;
+    struct is_function
+    : public integral_constant<bool, (__is_function_helper<_Tp>::__value
+				      && !is_reference<_Tp>::value
+				      && !is_void<_Tp>::value)>
+    { };
 
   /// @brief  composite type traits [4.5.2].
   template<typename _Tp>
diff -urN libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/is_object.cc libstdc++-v3/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/is_object.cc
--- libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/is_object.cc	1970-01-01 01:00:00.000000000 +0100
+++ libstdc++-v3/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/is_object.cc	2004-12-16 10:53:06.000000000 +0100
@@ -0,0 +1,50 @@
+// 2004-12-16  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 4.5.2 Composite type traits
+
+#include <tr1/type_traits>
+#include <testsuite_hooks.h>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using std::tr1::is_object;
+  using namespace __gnu_test;
+  
+  VERIFY( (test_category<is_object, int (int)>(false)) );
+  VERIFY( (test_category<is_object, ClassType (ClassType)>(false)) );
+  VERIFY( (test_category<is_object, float (int, float, int[], int&)>(false)) );
+  VERIFY( (test_category<is_object, int&>(false)) );
+  VERIFY( (test_category<is_object, ClassType&>(false)) );
+  VERIFY( (test_category<is_object, int(&)(int)>(false)) );
+  VERIFY( (test_category<is_object, void>(false)) );
+  VERIFY( (test_category<is_object, const void>(false)) );
+
+  // Sanity check.
+  VERIFY( (test_category<is_object, ClassType>(true)) );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff -urN libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/typedefs.cc libstdc++-v3/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/typedefs.cc
--- libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/typedefs.cc	1970-01-01 01:00:00.000000000 +0100
+++ libstdc++-v3/testsuite/tr1/4_metaprogramming/composite_type_traits/is_object/typedefs.cc	2004-12-16 10:49:31.000000000 +0100
@@ -0,0 +1,36 @@
+// 2004-12-16  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 
+// NB: This file is for testing tr1/type_traits with NO OTHER INCLUDES.
+
+#include <tr1/type_traits>
+
+// { dg-do compile }
+
+void test01()
+{
+  // Check for required typedefs
+  typedef std::tr1::is_object<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;
+}
diff -urN libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/is_function.cc libstdc++-v3/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/is_function.cc
--- libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/is_function.cc	1970-01-01 01:00:00.000000000 +0100
+++ libstdc++-v3/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/is_function.cc	2004-12-16 12:24:43.000000000 +0100
@@ -0,0 +1,51 @@
+// 2004-12-16  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 4.5.1 Primary type categories
+
+#include <tr1/type_traits>
+#include <testsuite_hooks.h>
+#include <testsuite_tr1.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using std::tr1::is_function;
+  using namespace __gnu_test;
+
+  // Positive tests.
+  VERIFY( (test_category<is_function, int (int)>(true)) );
+  VERIFY( (test_category<is_function, ClassType (ClassType)>(true)) );
+  VERIFY( (test_category<is_function, float (int, float, int[], int&)>(true)) );
+
+  // Negative tests.
+  VERIFY( (test_category<is_function, int&>(false)) );
+  VERIFY( (test_category<is_function, void>(false)) );
+  VERIFY( (test_category<is_function, const void>(false)) );
+  
+  // Sanity check.
+  VERIFY( (test_category<is_function, ClassType>(false)) );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff -urN libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/typedefs.cc libstdc++-v3/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/typedefs.cc
--- libstdc++-v3-orig/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/typedefs.cc	1970-01-01 01:00:00.000000000 +0100
+++ libstdc++-v3/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/typedefs.cc	2004-12-16 10:41:29.000000000 +0100
@@ -0,0 +1,36 @@
+// 2004-12-16  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2004 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// 
+// NB: This file is for testing tr1/type_traits with NO OTHER INCLUDES.
+
+#include <tr1/type_traits>
+
+// { dg-do compile }
+
+void test01()
+{
+  // Check for required typedefs
+  typedef std::tr1::is_function<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;
+}

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