// TR1 type_traits -*- C++ -*-
-// Copyright (C) 2007 Free Software Foundation, Inc.
+// Copyright (C) 2007, 2008, 2009 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)
+// 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,
// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-// USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
/** @file tr1_impl/type_traits
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
-#include <tr1_impl/type_traitsfwd.h>
-
namespace std
{
_GLIBCXX_BEGIN_NAMESPACE_TR1
+ /**
+ * @defgroup metaprogramming Type Traits
+ * @ingroup utilities
+ *
+ * Compile time type transformation and information.
+ * @{
+ */
+
// For use in __is_convertible_simple.
struct __sfinae_types
{
typedef struct { char __arr[2]; } __two;
};
-#define _DEFINE_SPEC_BODY(_Value) \
+#define _DEFINE_SPEC_0_HELPER \
+ template<>
+
+#define _DEFINE_SPEC_1_HELPER \
+ template<typename _Tp>
+
+#define _DEFINE_SPEC_2_HELPER \
+ template<typename _Tp, typename _Cp>
+
+#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \
+ _DEFINE_SPEC_##_Order##_HELPER \
+ struct _Trait<_Type> \
: public integral_constant<bool, _Value> { };
-#define _DEFINE_SPEC_0_HELPER(_Spec, _Value) \
- template<> \
- struct _Spec \
- _DEFINE_SPEC_BODY(_Value)
-
-#define _DEFINE_SPEC_1_HELPER(_Spec, _Value) \
- template<typename _Tp> \
- struct _Spec \
- _DEFINE_SPEC_BODY(_Value)
-
-#define _DEFINE_SPEC_2_HELPER(_Spec, _Value) \
- template<typename _Tp, typename _Cp> \
- struct _Spec \
- _DEFINE_SPEC_BODY(_Value)
-
-#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \
- _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type>, _Value) \
- _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type const>, _Value) \
- _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type volatile>, _Value) \
- _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type const volatile>, _Value)
-
- /// @brief helper classes [4.3].
+ // helper classes [4.3].
+
+ /// integral_constant
template<typename _Tp, _Tp __v>
struct integral_constant
{
typedef _Tp value_type;
typedef integral_constant<_Tp, __v> type;
};
+
+ /// typedef for true_type
typedef integral_constant<bool, true> true_type;
+
+ /// typedef for false_type
typedef integral_constant<bool, false> false_type;
template<typename _Tp, _Tp __v>
const _Tp integral_constant<_Tp, __v>::value;
- /// @brief primary type categories [4.5.1].
+ /// remove_cv
template<typename>
- struct is_void
+ struct remove_cv;
+
+ template<typename>
+ struct __is_void_helper
: public false_type { };
- _DEFINE_SPEC(0, is_void, void, true)
+ _DEFINE_SPEC(0, __is_void_helper, void, true)
+
+ // primary type categories [4.5.1].
+
+ /// is_void
+ template<typename _Tp>
+ struct is_void
+ : public integral_constant<bool, (__is_void_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
template<typename>
- struct is_integral
+ struct __is_integral_helper
: public false_type { };
- _DEFINE_SPEC(0, is_integral, bool, true)
- _DEFINE_SPEC(0, is_integral, char, true)
- _DEFINE_SPEC(0, is_integral, signed char, true)
- _DEFINE_SPEC(0, is_integral, unsigned char, true)
+ _DEFINE_SPEC(0, __is_integral_helper, bool, true)
+ _DEFINE_SPEC(0, __is_integral_helper, char, true)
+ _DEFINE_SPEC(0, __is_integral_helper, signed char, true)
+ _DEFINE_SPEC(0, __is_integral_helper, unsigned char, true)
#ifdef _GLIBCXX_USE_WCHAR_T
- _DEFINE_SPEC(0, is_integral, wchar_t, true)
+ _DEFINE_SPEC(0, __is_integral_helper, wchar_t, true)
+#endif
+#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
+ _DEFINE_SPEC(0, __is_integral_helper, char16_t, true)
+ _DEFINE_SPEC(0, __is_integral_helper, char32_t, true)
#endif
- _DEFINE_SPEC(0, is_integral, short, true)
- _DEFINE_SPEC(0, is_integral, unsigned short, true)
- _DEFINE_SPEC(0, is_integral, int, true)
- _DEFINE_SPEC(0, is_integral, unsigned int, true)
- _DEFINE_SPEC(0, is_integral, long, true)
- _DEFINE_SPEC(0, is_integral, unsigned long, true)
- _DEFINE_SPEC(0, is_integral, long long, true)
- _DEFINE_SPEC(0, is_integral, unsigned long long, true)
+ _DEFINE_SPEC(0, __is_integral_helper, short, true)
+ _DEFINE_SPEC(0, __is_integral_helper, unsigned short, true)
+ _DEFINE_SPEC(0, __is_integral_helper, int, true)
+ _DEFINE_SPEC(0, __is_integral_helper, unsigned int, true)
+ _DEFINE_SPEC(0, __is_integral_helper, long, true)
+ _DEFINE_SPEC(0, __is_integral_helper, unsigned long, true)
+ _DEFINE_SPEC(0, __is_integral_helper, long long, true)
+ _DEFINE_SPEC(0, __is_integral_helper, unsigned long long, true)
+
+ /// is_integral
+ template<typename _Tp>
+ struct is_integral
+ : public integral_constant<bool, (__is_integral_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
template<typename>
- struct is_floating_point
+ struct __is_floating_point_helper
: public false_type { };
- _DEFINE_SPEC(0, is_floating_point, float, true)
- _DEFINE_SPEC(0, is_floating_point, double, true)
- _DEFINE_SPEC(0, is_floating_point, long double, true)
+ _DEFINE_SPEC(0, __is_floating_point_helper, float, true)
+ _DEFINE_SPEC(0, __is_floating_point_helper, double, true)
+ _DEFINE_SPEC(0, __is_floating_point_helper, long double, true)
+
+ /// is_floating_point
+ template<typename _Tp>
+ struct is_floating_point
+ : public integral_constant<bool, (__is_floating_point_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
+ /// is_array
template<typename>
struct is_array
: public false_type { };
: public true_type { };
template<typename>
- struct is_pointer
+ struct __is_pointer_helper
: public false_type { };
- _DEFINE_SPEC(1, is_pointer, _Tp*, true)
-
+ _DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true)
+
+ /// is_pointer
+ template<typename _Tp>
+ struct is_pointer
+ : public integral_constant<bool, (__is_pointer_helper<typename
+ remove_cv<_Tp>::type>::value)>
+ { };
+
+ /// is_reference
+ template<typename _Tp>
+ struct is_reference;
+
+ /// is_function
+ template<typename _Tp>
+ struct is_function;
+
template<typename>
- struct is_member_object_pointer
+ struct __is_member_object_pointer_helper
: public false_type { };
- _DEFINE_SPEC(2, is_member_object_pointer, _Tp _Cp::*,
+ _DEFINE_SPEC(2, __is_member_object_pointer_helper, _Tp _Cp::*,
!is_function<_Tp>::value)
+ /// is_member_object_pointer
+ template<typename _Tp>
+ struct is_member_object_pointer
+ : public integral_constant<bool, (__is_member_object_pointer_helper<
+ typename remove_cv<_Tp>::type>::value)>
+ { };
+
template<typename>
- struct is_member_function_pointer
+ struct __is_member_function_pointer_helper
: public false_type { };
- _DEFINE_SPEC(2, is_member_function_pointer, _Tp _Cp::*,
+ _DEFINE_SPEC(2, __is_member_function_pointer_helper, _Tp _Cp::*,
is_function<_Tp>::value)
+ /// is_member_function_pointer
+ template<typename _Tp>
+ struct is_member_function_pointer
+ : public integral_constant<bool, (__is_member_function_pointer_helper<
+ typename remove_cv<_Tp>::type>::value)>
+ { };
+
+ /// is_enum
template<typename _Tp>
struct is_enum
: public integral_constant<bool, __is_enum(_Tp)>
{ };
+ /// is_union
template<typename _Tp>
struct is_union
: public integral_constant<bool, __is_union(_Tp)>
{ };
+ /// is_class
template<typename _Tp>
struct is_class
: public integral_constant<bool, __is_class(_Tp)>
{ };
+ /// is_function
template<typename>
- struct __is_function_helper
+ struct is_function
: public false_type { };
-
template<typename _Res, typename... _ArgTypes>
- struct __is_function_helper<_Res(_ArgTypes...)>
+ struct is_function<_Res(_ArgTypes...)>
: public true_type { };
-
template<typename _Res, typename... _ArgTypes>
- struct __is_function_helper<_Res(_ArgTypes......)>
+ struct is_function<_Res(_ArgTypes......)>
+ : public true_type { };
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes...) const>
+ : public true_type { };
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes......) const>
+ : public true_type { };
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes...) volatile>
+ : public true_type { };
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes......) volatile>
+ : public true_type { };
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes...) const volatile>
+ : public true_type { };
+ template<typename _Res, typename... _ArgTypes>
+ struct is_function<_Res(_ArgTypes......) const volatile>
: public true_type { };
- template<typename _Tp>
- struct is_function
- : public integral_constant<bool, (__is_function_helper<typename
- remove_cv<_Tp>::type>::value)>
- { };
-
- /// @brief composite type traits [4.5.2].
+ // composite type traits [4.5.2].
+
+ /// is_arithmetic
template<typename _Tp>
struct is_arithmetic
: public integral_constant<bool, (is_integral<_Tp>::value
|| is_floating_point<_Tp>::value)>
{ };
+ /// is_fundamental
template<typename _Tp>
struct is_fundamental
: public integral_constant<bool, (is_arithmetic<_Tp>::value
|| is_void<_Tp>::value)>
{ };
+ /// is_object
template<typename _Tp>
struct is_object
: public integral_constant<bool, !(is_function<_Tp>::value
|| is_void<_Tp>::value)>
{ };
+ /// is_member_pointer
+ template<typename _Tp>
+ struct is_member_pointer;
+
+ /// is_scalar
template<typename _Tp>
struct is_scalar
: public integral_constant<bool, (is_arithmetic<_Tp>::value
|| is_member_pointer<_Tp>::value)>
{ };
+ /// is_compound
template<typename _Tp>
struct is_compound
: public integral_constant<bool, !is_fundamental<_Tp>::value> { };
+ /// is_member_pointer
+ template<typename _Tp>
+ struct __is_member_pointer_helper
+ : public false_type { };
+ _DEFINE_SPEC(2, __is_member_pointer_helper, _Tp _Cp::*, true)
+
template<typename _Tp>
- struct is_member_pointer
- : public integral_constant<bool,
- (is_member_object_pointer<_Tp>::value
- || is_member_function_pointer<_Tp>::value)>
+ struct is_member_pointer
+ : public integral_constant<bool, (__is_member_pointer_helper<
+ typename remove_cv<_Tp>::type>::value)>
{ };
- /// @brief type properties [4.5.3].
+ // type properties [4.5.3].
+ /// is_const
template<typename>
struct is_const
: public false_type { };
struct is_const<_Tp const>
: public true_type { };
+ /// is_volatile
template<typename>
struct is_volatile
: public false_type { };
struct is_volatile<_Tp volatile>
: public true_type { };
+ /// is_empty
template<typename _Tp>
struct is_empty
: public integral_constant<bool, __is_empty(_Tp)>
{ };
+ /// is_polymorphic
template<typename _Tp>
struct is_polymorphic
: public integral_constant<bool, __is_polymorphic(_Tp)>
{ };
+ /// is_abstract
template<typename _Tp>
struct is_abstract
: public integral_constant<bool, __is_abstract(_Tp)>
{ };
+ /// has_virtual_destructor
template<typename _Tp>
struct has_virtual_destructor
: public integral_constant<bool, __has_virtual_destructor(_Tp)>
{ };
+ /// alignment_of
template<typename _Tp>
struct alignment_of
: public integral_constant<std::size_t, __alignof__(_Tp)> { };
+ /// rank
template<typename>
struct rank
: public integral_constant<std::size_t, 0> { };
template<typename _Tp>
struct rank<_Tp[]>
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
-
- template<typename, unsigned>
+
+ /// extent
+ template<typename, unsigned _Uint = 0>
struct extent
: public integral_constant<std::size_t, 0> { };
_Uint == 0 ? 0 : extent<_Tp,
_Uint - 1>::value>
{ };
-
- /// @brief relationships between types [4.6].
+
+ // relationships between types [4.6].
+
+ /// is_same
template<typename, typename>
struct is_same
: public false_type { };
struct is_same<_Tp, _Tp>
: public true_type { };
- /// @brief const-volatile modifications [4.7.1].
+ // const-volatile modifications [4.7.1].
+
+ /// remove_const
template<typename _Tp>
struct remove_const
{ typedef _Tp type; };
struct remove_const<_Tp const>
{ typedef _Tp type; };
+ /// remove_volatile
template<typename _Tp>
struct remove_volatile
{ typedef _Tp type; };
struct remove_volatile<_Tp volatile>
{ typedef _Tp type; };
+ /// remove_cv
template<typename _Tp>
struct remove_cv
{
remove_const<typename remove_volatile<_Tp>::type>::type type;
};
+ /// add_const
template<typename _Tp>
struct add_const
{ typedef _Tp const type; };
+ /// add_volatile
template<typename _Tp>
struct add_volatile
{ typedef _Tp volatile type; };
+ /// add_cv
template<typename _Tp>
struct add_cv
{
add_const<typename add_volatile<_Tp>::type>::type type;
};
- /// @brief array modifications [4.7.3].
+ // array modifications [4.7.3].
+
+ /// remove_extent
template<typename _Tp>
struct remove_extent
{ typedef _Tp type; };
struct remove_extent<_Tp[]>
{ typedef _Tp type; };
+ /// remove_all_extents
template<typename _Tp>
struct remove_all_extents
{ typedef _Tp type; };
struct remove_all_extents<_Tp[]>
{ typedef typename remove_all_extents<_Tp>::type type; };
- /// @brief pointer modifications [4.7.4].
-#undef _DEFINE_SPEC_BODY
-#define _DEFINE_SPEC_BODY(_Value) \
+ // pointer modifications [4.7.4].
+
+ template<typename _Tp, typename>
+ struct __remove_pointer_helper
{ typedef _Tp type; };
+ template<typename _Tp, typename _Up>
+ struct __remove_pointer_helper<_Tp, _Up*>
+ { typedef _Up type; };
+
+ /// remove_pointer
template<typename _Tp>
struct remove_pointer
- { typedef _Tp type; };
- _DEFINE_SPEC(1, remove_pointer, _Tp*, false)
-
+ : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
+ { };
+
+ template<typename>
+ struct remove_reference;
+
+ /// add_pointer
template<typename _Tp>
struct add_pointer
{ typedef typename remove_reference<_Tp>::type* type; };
#undef _DEFINE_SPEC_1_HELPER
#undef _DEFINE_SPEC_2_HELPER
#undef _DEFINE_SPEC
-#undef _DEFINE_SPEC_BODY
+ // @} group metaprogramming
_GLIBCXX_END_NAMESPACE_TR1
}
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