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type_traits: Implement is_empty.
2005-01-28 Paolo Carlini <pcarlini@suse.de> * include/tr1/type_traits: Implement is_empty. * testsuite/tr1/4_metaprogramming/type_properties/is_empty/ is_empty.cc: New. * testsuite/tr1/4_metaprogramming/type_properties/is_empty/ typedefs.cc: Likewise. * include/tr1/type_traits (__is_abstract_helper): Simplify a bit. From-SVN: r94379
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@ -1,3 +1,13 @@
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2005-01-28 Paolo Carlini <pcarlini@suse.de>
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* include/tr1/type_traits: Implement is_empty.
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* testsuite/tr1/4_metaprogramming/type_properties/is_empty/
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is_empty.cc: New.
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* testsuite/tr1/4_metaprogramming/type_properties/is_empty/
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typedefs.cc: Likewise.
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* include/tr1/type_traits (__is_abstract_helper): Simplify a bit.
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2005-01-28 Paolo Carlini <pcarlini@suse.de>
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* include/tr1/type_traits: Implement is_abstract, by exploiting the
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@ -477,10 +477,38 @@ namespace tr1
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remove_all_extents<_Tp>::type>::value)>
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{ };
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template<typename>
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struct __is_empty_helper_1
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{ };
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template<typename _Tp>
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struct __is_empty_helper_2
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: public _Tp { };
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// Unfortunately, without compiler support we cannot tell union from
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// class types, and is_empty doesn't work at all with the former.
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template<typename _Tp, bool = (is_fundamental<_Tp>::value
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|| is_array<_Tp>::value
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|| is_pointer<_Tp>::value
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|| is_reference<_Tp>::value
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|| is_member_pointer<_Tp>::value
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|| is_enum<_Tp>::value
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|| is_function<_Tp>::value)>
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struct __is_empty_helper
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{ static const bool __value = (sizeof(__is_empty_helper_1<_Tp>)
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== sizeof(__is_empty_helper_2<_Tp>)); };
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template<typename _Tp>
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struct __is_empty_helper<_Tp, true>
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{ static const bool __value = false; };
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template<typename _Tp>
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struct is_empty
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: public integral_constant<bool, __is_empty_helper<_Tp>::__value>
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{ };
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// Exploit the resolution DR core/337.
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template<typename _Tp, bool = (is_void<_Tp>::value
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|| is_function<_Tp>::value
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|| is_reference<_Tp>::value)>
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template<typename _Tp, bool = !is_object<_Tp>::value>
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struct __is_abstract_helper
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: public __sfinae_types
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{
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@ -0,0 +1,73 @@
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// 2005-01-28 Paolo Carlini <pcarlini@suse.de>
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//
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// Copyright (C) 2005 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// 4.5.3 Type properties
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#include <tr1/type_traits>
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#include <testsuite_hooks.h>
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#include <testsuite_tr1.h>
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class EmptyClassOne
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{ typedef int type; };
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class EmptyClassTwo
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{ static int data; };
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class EmptyClassThree
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{ int f(); };
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class NonEmptyClassOne
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{ int data; };
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class NonEmptyClassTwo
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{ virtual int f(); };
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void test01()
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{
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bool test __attribute__((unused)) = true;
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using std::tr1::is_empty;
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using namespace __gnu_test;
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// Positive tests.
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VERIFY( (test_category<is_empty, ClassType>(true)) );
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VERIFY( (test_category<is_empty, EmptyClassOne>(true)) );
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VERIFY( (test_category<is_empty, EmptyClassTwo>(true)) );
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VERIFY( (test_category<is_empty, EmptyClassThree>(true)) );
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// Negative tests.
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VERIFY( (test_category<is_empty, void>(false)) );
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VERIFY( (test_category<is_empty, float>(false)) );
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VERIFY( (test_category<is_empty, int[4]>(false)) );
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VERIFY( (test_category<is_empty, int*>(false)) );
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VERIFY( (test_category<is_empty, int&>(false)) );
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VERIFY( (test_category<is_empty, int (ClassType::*)>(false)) );
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VERIFY( (test_category<is_empty, EnumType>(false)) );
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VERIFY( (test_category<is_empty, int (int)>(false)) );
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VERIFY( (test_category<is_empty, AbstractClass>(false)) );
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VERIFY( (test_category<is_empty, NonEmptyClassOne>(false)) );
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VERIFY( (test_category<is_empty, NonEmptyClassTwo>(false)) );
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}
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int main()
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{
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test01();
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return 0;
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}
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@ -0,0 +1,36 @@
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// 2005-01-28 Paolo Carlini <pcarlini@suse.de>
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//
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// Copyright (C) 2005 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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//
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// NB: This file is for testing tr1/type_traits with NO OTHER INCLUDES.
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#include <tr1/type_traits>
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// { dg-do compile }
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void test01()
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{
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// Check for required typedefs
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typedef std::tr1::is_empty<int> test_type;
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typedef test_type::value_type value_type;
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typedef test_type::type type;
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typedef test_type::type::value_type type_value_type;
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typedef test_type::type::type type_type;
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}
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