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type_traits: Implement is_abstract, by exploiting the resolution of DR core/337.

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2005-01-28  Paolo Carlini  <pcarlini@suse.de>

	* include/tr1/type_traits: Implement is_abstract, by exploiting the
	resolution of DR core/337.
	* testsuite/testsuite_tr1.h: Add AbstractClass.
	* testsuite/tr1/4_metaprogramming/type_properties/is_abstract/
	is_abstract.cc: New.
	* testsuite/tr1/4_metaprogramming/type_properties/is_abstract/
	typedefs.cc: Likewise.

	* include/tr1/type_traits (is_function): Rewrite, use the conversion
	F& -> F* instead, thus avoiding problems with abstract classes.
	* testsuite/tr1/4_metaprogramming/primary_type_categories/
	is_function/is_function.cc: Add a test for tricky AbstractClass.

From-SVN: r94370
This commit is contained in:
Paolo Carlini 2005-01-28 13:29:41 +00:00 committed by Paolo Carlini
parent 2aa3d033a1
commit f8023b7846
6 changed files with 151 additions and 23 deletions
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15
libstdc++-v3/ChangeLog
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@ -1,3 +1,18 @@
2005-01-28 Paolo Carlini <pcarlini@suse.de>
* include/tr1/type_traits: Implement is_abstract, by exploiting the
resolution of DR core/337.
* testsuite/testsuite_tr1.h: Add AbstractClass.
* testsuite/tr1/4_metaprogramming/type_properties/is_abstract/
is_abstract.cc: New.
* testsuite/tr1/4_metaprogramming/type_properties/is_abstract/
typedefs.cc: Likewise.
* include/tr1/type_traits (is_function): Rewrite, use the conversion
F& -> F* instead, thus avoiding problems with abstract classes.
* testsuite/tr1/4_metaprogramming/primary_type_categories/
is_function/is_function.cc: Add a test for tricky AbstractClass.
2005-01-26 Paolo Carlini <pcarlini@suse.de>
* include/ext/mt_allocator.h

65
libstdc++-v3/include/tr1/type_traits
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@ -33,13 +33,26 @@ namespace std
{
namespace tr1
{
// For use in is_enum, is_function, and elsewhere.
// For use in is_enum, is_abstract and elsewhere.
struct __sfinae_types
{
typedef char __one;
typedef struct { char __arr[2]; } __two;
};
template<typename _From, typename _To>
struct __conv_helper
: public __sfinae_types
{
private:
static __one __test(_To);
static __two __test(...);
static _From __makeFrom();
public:
static const bool __value = sizeof(__test(__makeFrom())) == 1;
};
#define _DEFINE_SPEC_BODY(_Value) \
: public integral_constant<bool, _Value> { };
@ -393,28 +406,13 @@ namespace tr1
struct is_enum
: public integral_constant<bool, __is_enum_helper<_Tp>::__value> { };
template<typename _Tp, bool = (is_reference<_Tp>::value
|| is_void<_Tp>::value)>
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_helper<_Tp, true>
{ static const bool __value = false; };
template<typename _Tp>
struct is_function
: public integral_constant<bool, __is_function_helper<_Tp>::__value> { };
: public integral_constant<bool,
(__conv_helper<typename add_reference<_Tp>::type,
typename add_pointer<_Tp>::type>::__value)>
{ };
_DEFINE_SPEC(0, is_function, void, false)
/// @brief composite type traits [4.5.2].
template<typename _Tp>
@ -479,6 +477,31 @@ namespace tr1
remove_all_extents<_Tp>::type>::value)>
{ };
// Exploit the resolution DR core/337.
template<typename _Tp, bool = (is_void<_Tp>::value
|| is_function<_Tp>::value
|| is_reference<_Tp>::value)>
struct __is_abstract_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_abstract_helper<_Tp, true>
{ static const bool __value = false; };
template<typename _Tp>
struct is_abstract
: public integral_constant<bool, __is_abstract_helper<_Tp>::__value> { };
template<typename _Tp>
struct has_trivial_constructor
: public integral_constant<bool, is_pod<_Tp>::value> { };

5
libstdc++-v3/testsuite/testsuite_tr1.h
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@ -1,7 +1,7 @@
// -*- C++ -*-
// Testing utilities for the tr1 testsuite.
//
// Copyright (C) 2004 Free Software Foundation, Inc.
// Copyright (C) 2004, 2005 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
@ -117,6 +117,9 @@ namespace __gnu_test
struct ConvType
{ operator int() const; };
class AbstractClass
{ virtual void rotate(int) = 0; };
}; // namespace __gnu_test

4
libstdc++-v3/testsuite/tr1/4_metaprogramming/primary_type_categories/is_function/is_function.cc
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@ -1,6 +1,6 @@
// 2004-12-16 Paolo Carlini <pcarlini@suse.de>
//
// Copyright (C) 2004 Free Software Foundation, Inc.
// Copyright (C) 2004, 2005 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
@ -39,6 +39,8 @@ void test01()
VERIFY( (test_category<is_function, int&>(false)) );
VERIFY( (test_category<is_function, void>(false)) );
VERIFY( (test_category<is_function, const void>(false)) );
VERIFY( (test_category<is_function, AbstractClass>(false)) );
// Sanity check.
VERIFY( (test_category<is_function, ClassType>(false)) );

49
libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_abstract/is_abstract.cc Normal file
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@ -0,0 +1,49 @@
// 2005-01-28 Paolo Carlini <pcarlini@suse.de>
//
// Copyright (C) 2005 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.
// 4.5.3 Type properties
#include <tr1/type_traits>
#include <testsuite_hooks.h>
#include <testsuite_tr1.h>
void test01()
{
bool test __attribute__((unused)) = true;
using std::tr1::is_abstract;
using namespace __gnu_test;
// Positive tests.
VERIFY( (test_category<is_abstract, AbstractClass>(true)) );
// Negative tests.
VERIFY( (test_category<is_abstract, void>(false)) );
VERIFY( (test_category<is_abstract, int (int)>(false)) );
VERIFY( (test_category<is_abstract, int&>(false)) );
// Sanity check.
VERIFY( (test_category<is_abstract, ClassType>(false)) );
}
int main()
{
test01();
return 0;
}

36
libstdc++-v3/testsuite/tr1/4_metaprogramming/type_properties/is_abstract/typedefs.cc Normal file
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@ -0,0 +1,36 @@
// 2005-01-28 Paolo Carlini <pcarlini@suse.de>
//
// Copyright (C) 2005 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_abstract<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;
}