447 lines
12 KiB
C++
447 lines
12 KiB
C++
// TR1 type_traits -*- C++ -*-
|
|
|
|
// Copyright (C) 2007, 2008 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
|
|
// USA.
|
|
|
|
// 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.
|
|
|
|
/** @file tr1_impl/type_traits
|
|
* This is an internal header file, included by other library headers.
|
|
* You should not attempt to use it directly.
|
|
*/
|
|
|
|
namespace std
|
|
{
|
|
_GLIBCXX_BEGIN_NAMESPACE_TR1
|
|
|
|
// For use in __is_convertible_simple.
|
|
struct __sfinae_types
|
|
{
|
|
typedef char __one;
|
|
typedef struct { char __arr[2]; } __two;
|
|
};
|
|
|
|
#define _DEFINE_SPEC_BODY(_Value) \
|
|
: 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)
|
|
|
|
/// 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 for true_type
|
|
typedef integral_constant<bool, true> true_type;
|
|
|
|
/// typedef for true_type
|
|
typedef integral_constant<bool, false> false_type;
|
|
|
|
template<typename _Tp, _Tp __v>
|
|
const _Tp integral_constant<_Tp, __v>::value;
|
|
|
|
/// primary type categories [4.5.1].
|
|
template<typename>
|
|
struct is_void
|
|
: public false_type { };
|
|
_DEFINE_SPEC(0, is_void, void, true)
|
|
|
|
/// is_integral
|
|
template<typename>
|
|
struct is_integral
|
|
: 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)
|
|
#ifdef _GLIBCXX_USE_WCHAR_T
|
|
_DEFINE_SPEC(0, is_integral, wchar_t, true)
|
|
#endif
|
|
#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
|
|
_DEFINE_SPEC(0, is_integral, char16_t, true)
|
|
_DEFINE_SPEC(0, is_integral, 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)
|
|
|
|
/// is_floating_point
|
|
template<typename>
|
|
struct is_floating_point
|
|
: 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)
|
|
|
|
/// is_array
|
|
template<typename>
|
|
struct is_array
|
|
: public false_type { };
|
|
|
|
template<typename _Tp, std::size_t _Size>
|
|
struct is_array<_Tp[_Size]>
|
|
: public true_type { };
|
|
|
|
template<typename _Tp>
|
|
struct is_array<_Tp[]>
|
|
: public true_type { };
|
|
|
|
/// is_pointer
|
|
template<typename>
|
|
struct is_pointer
|
|
: public false_type { };
|
|
_DEFINE_SPEC(1, is_pointer, _Tp*, true)
|
|
|
|
/// is_reference
|
|
template<typename _Tp>
|
|
struct is_reference;
|
|
|
|
/// is_function
|
|
template<typename _Tp>
|
|
struct is_function;
|
|
|
|
/// is_member_object_pointer
|
|
template<typename>
|
|
struct is_member_object_pointer
|
|
: public false_type { };
|
|
_DEFINE_SPEC(2, is_member_object_pointer, _Tp _Cp::*,
|
|
!is_function<_Tp>::value)
|
|
|
|
/// is_member_function_pointer
|
|
template<typename>
|
|
struct is_member_function_pointer
|
|
: public false_type { };
|
|
_DEFINE_SPEC(2, is_member_function_pointer, _Tp _Cp::*,
|
|
is_function<_Tp>::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)>
|
|
{ };
|
|
|
|
template<typename _Tp>
|
|
struct __in_array
|
|
: public __sfinae_types
|
|
{
|
|
private:
|
|
template<typename _Up>
|
|
static __one __test(_Up(*)[1]);
|
|
template<typename>
|
|
static __two __test(...);
|
|
|
|
public:
|
|
static const bool __value = sizeof(__test<_Tp>(0)) == 1;
|
|
};
|
|
|
|
/// is_abstract
|
|
template<typename _Tp>
|
|
struct is_abstract;
|
|
|
|
/// is_function
|
|
template<typename _Tp>
|
|
struct is_function
|
|
: public integral_constant<bool, !(__in_array<_Tp>::__value
|
|
|| is_abstract<_Tp>::value
|
|
|| is_reference<_Tp>::value
|
|
|| is_void<_Tp>::value)>
|
|
{ };
|
|
|
|
/// composite type traits [4.5.2].
|
|
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_reference<_Tp>::value
|
|
|| is_void<_Tp>::value)>
|
|
{ };
|
|
|
|
/// is_member_pointer
|
|
template<typename _Tp>
|
|
struct is_member_pointer;
|
|
|
|
/// is_scalal
|
|
template<typename _Tp>
|
|
struct is_scalar
|
|
: public integral_constant<bool, (is_arithmetic<_Tp>::value
|
|
|| is_enum<_Tp>::value
|
|
|| is_pointer<_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
|
|
: public integral_constant<bool,
|
|
(is_member_object_pointer<_Tp>::value
|
|
|| is_member_function_pointer<_Tp>::value)>
|
|
{ };
|
|
|
|
/// type properties [4.5.3].
|
|
template<typename>
|
|
struct is_const
|
|
: public false_type { };
|
|
|
|
/// is_const
|
|
template<typename _Tp>
|
|
struct is_const<_Tp const>
|
|
: public true_type { };
|
|
|
|
/// is_volatile
|
|
template<typename>
|
|
struct is_volatile
|
|
: public false_type { };
|
|
|
|
template<typename _Tp>
|
|
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, std::size_t _Size>
|
|
struct rank<_Tp[_Size]>
|
|
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
|
|
|
|
template<typename _Tp>
|
|
struct rank<_Tp[]>
|
|
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
|
|
|
|
/// extent
|
|
template<typename, unsigned _Uint = 0>
|
|
struct extent
|
|
: public integral_constant<std::size_t, 0> { };
|
|
|
|
template<typename _Tp, unsigned _Uint, std::size_t _Size>
|
|
struct extent<_Tp[_Size], _Uint>
|
|
: public integral_constant<std::size_t,
|
|
_Uint == 0 ? _Size : extent<_Tp,
|
|
_Uint - 1>::value>
|
|
{ };
|
|
|
|
template<typename _Tp, unsigned _Uint>
|
|
struct extent<_Tp[], _Uint>
|
|
: public integral_constant<std::size_t,
|
|
_Uint == 0 ? 0 : extent<_Tp,
|
|
_Uint - 1>::value>
|
|
{ };
|
|
|
|
/// relationships between types [4.6].
|
|
template<typename, typename>
|
|
struct is_same
|
|
: public false_type { };
|
|
|
|
template<typename _Tp>
|
|
struct is_same<_Tp, _Tp>
|
|
: public true_type { };
|
|
|
|
/// const-volatile modifications [4.7.1].
|
|
template<typename _Tp>
|
|
struct remove_const
|
|
{ typedef _Tp type; };
|
|
|
|
template<typename _Tp>
|
|
struct remove_const<_Tp const>
|
|
{ typedef _Tp type; };
|
|
|
|
/// remove_volatile
|
|
template<typename _Tp>
|
|
struct remove_volatile
|
|
{ typedef _Tp type; };
|
|
|
|
template<typename _Tp>
|
|
struct remove_volatile<_Tp volatile>
|
|
{ typedef _Tp type; };
|
|
|
|
/// remove_cv
|
|
template<typename _Tp>
|
|
struct remove_cv
|
|
{
|
|
typedef typename
|
|
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
|
|
{
|
|
typedef typename
|
|
add_const<typename add_volatile<_Tp>::type>::type type;
|
|
};
|
|
|
|
/// array modifications [4.7.3].
|
|
template<typename _Tp>
|
|
struct remove_extent
|
|
{ typedef _Tp type; };
|
|
|
|
template<typename _Tp, std::size_t _Size>
|
|
struct remove_extent<_Tp[_Size]>
|
|
{ typedef _Tp type; };
|
|
|
|
template<typename _Tp>
|
|
struct remove_extent<_Tp[]>
|
|
{ typedef _Tp type; };
|
|
|
|
/// remove_all_extents
|
|
template<typename _Tp>
|
|
struct remove_all_extents
|
|
{ typedef _Tp type; };
|
|
|
|
template<typename _Tp, std::size_t _Size>
|
|
struct remove_all_extents<_Tp[_Size]>
|
|
{ typedef typename remove_all_extents<_Tp>::type type; };
|
|
|
|
template<typename _Tp>
|
|
struct remove_all_extents<_Tp[]>
|
|
{ typedef typename remove_all_extents<_Tp>::type type; };
|
|
|
|
/// pointer modifications [4.7.4].
|
|
#undef _DEFINE_SPEC_BODY
|
|
#define _DEFINE_SPEC_BODY(_Value) \
|
|
{ typedef _Tp type; };
|
|
|
|
/// remove_pointer
|
|
template<typename _Tp>
|
|
struct remove_pointer
|
|
{ typedef _Tp type; };
|
|
_DEFINE_SPEC(1, remove_pointer, _Tp*, false)
|
|
|
|
/// remove_reference
|
|
template<typename _Tp>
|
|
struct remove_reference;
|
|
|
|
/// add_pointer
|
|
template<typename _Tp>
|
|
struct add_pointer
|
|
{ typedef typename remove_reference<_Tp>::type* type; };
|
|
|
|
#undef _DEFINE_SPEC_0_HELPER
|
|
#undef _DEFINE_SPEC_1_HELPER
|
|
#undef _DEFINE_SPEC_2_HELPER
|
|
#undef _DEFINE_SPEC
|
|
#undef _DEFINE_SPEC_BODY
|
|
|
|
_GLIBCXX_END_NAMESPACE_TR1
|
|
}
|