0,0 → 1,687 |
// TR1 type_traits -*- C++ -*- |
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// Copyright (C) 2004-2013 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 3, or (at your option) |
// any later version. |
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// 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. |
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// 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. |
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// 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/>. |
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/** @file tr1/type_traits |
* This is a TR1 C++ Library header. |
*/ |
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#ifndef _GLIBCXX_TR1_TYPE_TRAITS |
#define _GLIBCXX_TR1_TYPE_TRAITS 1 |
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#pragma GCC system_header |
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#include <bits/c++config.h> |
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namespace std _GLIBCXX_VISIBILITY(default) |
{ |
namespace tr1 |
{ |
_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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/** |
* @addtogroup metaprogramming |
* @{ |
*/ |
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struct __sfinae_types |
{ |
typedef char __one; |
typedef struct { char __arr[2]; } __two; |
}; |
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#define _DEFINE_SPEC_0_HELPER \ |
template<> |
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#define _DEFINE_SPEC_1_HELPER \ |
template<typename _Tp> |
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#define _DEFINE_SPEC_2_HELPER \ |
template<typename _Tp, typename _Cp> |
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#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \ |
_DEFINE_SPEC_##_Order##_HELPER \ |
struct _Trait<_Type> \ |
: public integral_constant<bool, _Value> { }; |
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// helper classes [4.3]. |
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/// integral_constant |
template<typename _Tp, _Tp __v> |
struct integral_constant |
{ |
static const _Tp value = __v; |
typedef _Tp value_type; |
typedef integral_constant<_Tp, __v> type; |
}; |
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/// typedef for true_type |
typedef integral_constant<bool, true> true_type; |
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/// typedef for false_type |
typedef integral_constant<bool, false> false_type; |
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template<typename _Tp, _Tp __v> |
const _Tp integral_constant<_Tp, __v>::value; |
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/// remove_cv |
template<typename> |
struct remove_cv; |
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template<typename> |
struct __is_void_helper |
: public false_type { }; |
_DEFINE_SPEC(0, __is_void_helper, void, true) |
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// primary type categories [4.5.1]. |
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/// is_void |
template<typename _Tp> |
struct is_void |
: public integral_constant<bool, (__is_void_helper<typename |
remove_cv<_Tp>::type>::value)> |
{ }; |
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template<typename> |
struct __is_integral_helper |
: public false_type { }; |
_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_helper, wchar_t, true) |
#endif |
_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) |
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/// is_integral |
template<typename _Tp> |
struct is_integral |
: public integral_constant<bool, (__is_integral_helper<typename |
remove_cv<_Tp>::type>::value)> |
{ }; |
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template<typename> |
struct __is_floating_point_helper |
: public false_type { }; |
_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) |
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/// is_floating_point |
template<typename _Tp> |
struct is_floating_point |
: public integral_constant<bool, (__is_floating_point_helper<typename |
remove_cv<_Tp>::type>::value)> |
{ }; |
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/// is_array |
template<typename> |
struct is_array |
: public false_type { }; |
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template<typename _Tp, std::size_t _Size> |
struct is_array<_Tp[_Size]> |
: public true_type { }; |
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template<typename _Tp> |
struct is_array<_Tp[]> |
: public true_type { }; |
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template<typename> |
struct __is_pointer_helper |
: public false_type { }; |
_DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true) |
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/// is_pointer |
template<typename _Tp> |
struct is_pointer |
: public integral_constant<bool, (__is_pointer_helper<typename |
remove_cv<_Tp>::type>::value)> |
{ }; |
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/// is_reference |
template<typename _Tp> |
struct is_reference; |
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/// is_function |
template<typename _Tp> |
struct is_function; |
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template<typename> |
struct __is_member_object_pointer_helper |
: public false_type { }; |
_DEFINE_SPEC(2, __is_member_object_pointer_helper, _Tp _Cp::*, |
!is_function<_Tp>::value) |
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/// 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)> |
{ }; |
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template<typename> |
struct __is_member_function_pointer_helper |
: public false_type { }; |
_DEFINE_SPEC(2, __is_member_function_pointer_helper, _Tp _Cp::*, |
is_function<_Tp>::value) |
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/// 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)> |
{ }; |
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/// is_enum |
template<typename _Tp> |
struct is_enum |
: public integral_constant<bool, __is_enum(_Tp)> |
{ }; |
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/// is_union |
template<typename _Tp> |
struct is_union |
: public integral_constant<bool, __is_union(_Tp)> |
{ }; |
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/// is_class |
template<typename _Tp> |
struct is_class |
: public integral_constant<bool, __is_class(_Tp)> |
{ }; |
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/// is_function |
template<typename> |
struct is_function |
: public false_type { }; |
template<typename _Res, typename... _ArgTypes> |
struct is_function<_Res(_ArgTypes...)> |
: public true_type { }; |
template<typename _Res, typename... _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 { }; |
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// composite type traits [4.5.2]. |
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/// is_arithmetic |
template<typename _Tp> |
struct is_arithmetic |
: public integral_constant<bool, (is_integral<_Tp>::value |
|| is_floating_point<_Tp>::value)> |
{ }; |
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/// is_fundamental |
template<typename _Tp> |
struct is_fundamental |
: public integral_constant<bool, (is_arithmetic<_Tp>::value |
|| is_void<_Tp>::value)> |
{ }; |
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/// is_object |
template<typename _Tp> |
struct is_object |
: public integral_constant<bool, !(is_function<_Tp>::value |
|| is_reference<_Tp>::value |
|| is_void<_Tp>::value)> |
{ }; |
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/// is_member_pointer |
template<typename _Tp> |
struct is_member_pointer; |
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/// is_scalar |
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)> |
{ }; |
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/// is_compound |
template<typename _Tp> |
struct is_compound |
: public integral_constant<bool, !is_fundamental<_Tp>::value> { }; |
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/// is_member_pointer |
template<typename _Tp> |
struct __is_member_pointer_helper |
: public false_type { }; |
_DEFINE_SPEC(2, __is_member_pointer_helper, _Tp _Cp::*, true) |
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template<typename _Tp> |
struct is_member_pointer |
: public integral_constant<bool, (__is_member_pointer_helper< |
typename remove_cv<_Tp>::type>::value)> |
{ }; |
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// type properties [4.5.3]. |
/// is_const |
template<typename> |
struct is_const |
: public false_type { }; |
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template<typename _Tp> |
struct is_const<_Tp const> |
: public true_type { }; |
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/// is_volatile |
template<typename> |
struct is_volatile |
: public false_type { }; |
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template<typename _Tp> |
struct is_volatile<_Tp volatile> |
: public true_type { }; |
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/// is_empty |
template<typename _Tp> |
struct is_empty |
: public integral_constant<bool, __is_empty(_Tp)> |
{ }; |
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/// is_polymorphic |
template<typename _Tp> |
struct is_polymorphic |
: public integral_constant<bool, __is_polymorphic(_Tp)> |
{ }; |
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/// is_abstract |
template<typename _Tp> |
struct is_abstract |
: public integral_constant<bool, __is_abstract(_Tp)> |
{ }; |
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/// has_virtual_destructor |
template<typename _Tp> |
struct has_virtual_destructor |
: public integral_constant<bool, __has_virtual_destructor(_Tp)> |
{ }; |
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/// alignment_of |
template<typename _Tp> |
struct alignment_of |
: public integral_constant<std::size_t, __alignof__(_Tp)> { }; |
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/// rank |
template<typename> |
struct rank |
: public integral_constant<std::size_t, 0> { }; |
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template<typename _Tp, std::size_t _Size> |
struct rank<_Tp[_Size]> |
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; |
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template<typename _Tp> |
struct rank<_Tp[]> |
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; |
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/// extent |
template<typename, unsigned _Uint = 0> |
struct extent |
: public integral_constant<std::size_t, 0> { }; |
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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> |
{ }; |
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template<typename _Tp, unsigned _Uint> |
struct extent<_Tp[], _Uint> |
: public integral_constant<std::size_t, |
_Uint == 0 ? 0 : extent<_Tp, |
_Uint - 1>::value> |
{ }; |
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// relationships between types [4.6]. |
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/// is_same |
template<typename, typename> |
struct is_same |
: public false_type { }; |
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template<typename _Tp> |
struct is_same<_Tp, _Tp> |
: public true_type { }; |
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// const-volatile modifications [4.7.1]. |
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/// remove_const |
template<typename _Tp> |
struct remove_const |
{ typedef _Tp type; }; |
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template<typename _Tp> |
struct remove_const<_Tp const> |
{ typedef _Tp type; }; |
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/// remove_volatile |
template<typename _Tp> |
struct remove_volatile |
{ typedef _Tp type; }; |
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template<typename _Tp> |
struct remove_volatile<_Tp volatile> |
{ typedef _Tp type; }; |
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/// remove_cv |
template<typename _Tp> |
struct remove_cv |
{ |
typedef typename |
remove_const<typename remove_volatile<_Tp>::type>::type type; |
}; |
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/// add_const |
template<typename _Tp> |
struct add_const |
{ typedef _Tp const type; }; |
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/// add_volatile |
template<typename _Tp> |
struct add_volatile |
{ typedef _Tp volatile type; }; |
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/// add_cv |
template<typename _Tp> |
struct add_cv |
{ |
typedef typename |
add_const<typename add_volatile<_Tp>::type>::type type; |
}; |
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// array modifications [4.7.3]. |
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/// remove_extent |
template<typename _Tp> |
struct remove_extent |
{ typedef _Tp type; }; |
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template<typename _Tp, std::size_t _Size> |
struct remove_extent<_Tp[_Size]> |
{ typedef _Tp type; }; |
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template<typename _Tp> |
struct remove_extent<_Tp[]> |
{ typedef _Tp type; }; |
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/// remove_all_extents |
template<typename _Tp> |
struct remove_all_extents |
{ typedef _Tp type; }; |
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template<typename _Tp, std::size_t _Size> |
struct remove_all_extents<_Tp[_Size]> |
{ typedef typename remove_all_extents<_Tp>::type type; }; |
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template<typename _Tp> |
struct remove_all_extents<_Tp[]> |
{ typedef typename remove_all_extents<_Tp>::type type; }; |
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// pointer modifications [4.7.4]. |
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template<typename _Tp, typename> |
struct __remove_pointer_helper |
{ typedef _Tp type; }; |
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template<typename _Tp, typename _Up> |
struct __remove_pointer_helper<_Tp, _Up*> |
{ typedef _Up type; }; |
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/// remove_pointer |
template<typename _Tp> |
struct remove_pointer |
: public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type> |
{ }; |
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template<typename> |
struct remove_reference; |
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/// add_pointer |
template<typename _Tp> |
struct add_pointer |
{ typedef typename remove_reference<_Tp>::type* type; }; |
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template<typename> |
struct is_reference |
: public false_type { }; |
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template<typename _Tp> |
struct is_reference<_Tp&> |
: public true_type { }; |
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template<typename _Tp> |
struct is_pod |
: public integral_constant<bool, __is_pod(_Tp) || is_void<_Tp>::value> |
{ }; |
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template<typename _Tp> |
struct has_trivial_constructor |
: public integral_constant<bool, is_pod<_Tp>::value> |
{ }; |
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template<typename _Tp> |
struct has_trivial_copy |
: public integral_constant<bool, is_pod<_Tp>::value> |
{ }; |
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template<typename _Tp> |
struct has_trivial_assign |
: public integral_constant<bool, is_pod<_Tp>::value> |
{ }; |
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template<typename _Tp> |
struct has_trivial_destructor |
: public integral_constant<bool, is_pod<_Tp>::value> |
{ }; |
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template<typename _Tp> |
struct has_nothrow_constructor |
: public integral_constant<bool, is_pod<_Tp>::value> |
{ }; |
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template<typename _Tp> |
struct has_nothrow_copy |
: public integral_constant<bool, is_pod<_Tp>::value> |
{ }; |
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template<typename _Tp> |
struct has_nothrow_assign |
: public integral_constant<bool, is_pod<_Tp>::value> |
{ }; |
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template<typename> |
struct __is_signed_helper |
: public false_type { }; |
_DEFINE_SPEC(0, __is_signed_helper, signed char, true) |
_DEFINE_SPEC(0, __is_signed_helper, short, true) |
_DEFINE_SPEC(0, __is_signed_helper, int, true) |
_DEFINE_SPEC(0, __is_signed_helper, long, true) |
_DEFINE_SPEC(0, __is_signed_helper, long long, true) |
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template<typename _Tp> |
struct is_signed |
: public integral_constant<bool, (__is_signed_helper<typename |
remove_cv<_Tp>::type>::value)> |
{ }; |
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template<typename> |
struct __is_unsigned_helper |
: public false_type { }; |
_DEFINE_SPEC(0, __is_unsigned_helper, unsigned char, true) |
_DEFINE_SPEC(0, __is_unsigned_helper, unsigned short, true) |
_DEFINE_SPEC(0, __is_unsigned_helper, unsigned int, true) |
_DEFINE_SPEC(0, __is_unsigned_helper, unsigned long, true) |
_DEFINE_SPEC(0, __is_unsigned_helper, unsigned long long, true) |
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template<typename _Tp> |
struct is_unsigned |
: public integral_constant<bool, (__is_unsigned_helper<typename |
remove_cv<_Tp>::type>::value)> |
{ }; |
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template<typename _Base, typename _Derived> |
struct __is_base_of_helper |
{ |
typedef typename remove_cv<_Base>::type _NoCv_Base; |
typedef typename remove_cv<_Derived>::type _NoCv_Derived; |
static const bool __value = (is_same<_Base, _Derived>::value |
|| (__is_base_of(_Base, _Derived) |
&& !is_same<_NoCv_Base, |
_NoCv_Derived>::value)); |
}; |
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template<typename _Base, typename _Derived> |
struct is_base_of |
: public integral_constant<bool, |
__is_base_of_helper<_Base, _Derived>::__value> |
{ }; |
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template<typename _From, typename _To> |
struct __is_convertible_simple |
: public __sfinae_types |
{ |
private: |
static __one __test(_To); |
static __two __test(...); |
static _From __makeFrom(); |
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public: |
static const bool __value = sizeof(__test(__makeFrom())) == 1; |
}; |
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template<typename _Tp> |
struct add_reference; |
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template<typename _Tp> |
struct __is_int_or_cref |
{ |
typedef typename remove_reference<_Tp>::type __rr_Tp; |
static const bool __value = (is_integral<_Tp>::value |
|| (is_integral<__rr_Tp>::value |
&& is_const<__rr_Tp>::value |
&& !is_volatile<__rr_Tp>::value)); |
}; |
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template<typename _From, typename _To, |
bool = (is_void<_From>::value || is_void<_To>::value |
|| is_function<_To>::value || is_array<_To>::value |
// This special case is here only to avoid warnings. |
|| (is_floating_point<typename |
remove_reference<_From>::type>::value |
&& __is_int_or_cref<_To>::__value))> |
struct __is_convertible_helper |
{ |
// "An imaginary lvalue of type From...". |
static const bool __value = (__is_convertible_simple<typename |
add_reference<_From>::type, _To>::__value); |
}; |
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template<typename _From, typename _To> |
struct __is_convertible_helper<_From, _To, true> |
{ static const bool __value = (is_void<_To>::value |
|| (__is_int_or_cref<_To>::__value |
&& !is_void<_From>::value)); }; |
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template<typename _From, typename _To> |
struct is_convertible |
: public integral_constant<bool, |
__is_convertible_helper<_From, _To>::__value> |
{ }; |
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// reference modifications [4.7.2]. |
template<typename _Tp> |
struct remove_reference |
{ typedef _Tp type; }; |
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template<typename _Tp> |
struct remove_reference<_Tp&> |
{ typedef _Tp type; }; |
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// NB: Careful with reference to void. |
template<typename _Tp, bool = (is_void<_Tp>::value |
|| is_reference<_Tp>::value)> |
struct __add_reference_helper |
{ typedef _Tp& type; }; |
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template<typename _Tp> |
struct __add_reference_helper<_Tp, true> |
{ typedef _Tp type; }; |
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template<typename _Tp> |
struct add_reference |
: public __add_reference_helper<_Tp> |
{ }; |
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// other transformations [4.8]. |
template<std::size_t _Len, std::size_t _Align> |
struct aligned_storage |
{ |
union type |
{ |
unsigned char __data[_Len]; |
struct __attribute__((__aligned__((_Align)))) { } __align; |
}; |
}; |
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#undef _DEFINE_SPEC_0_HELPER |
#undef _DEFINE_SPEC_1_HELPER |
#undef _DEFINE_SPEC_2_HELPER |
#undef _DEFINE_SPEC |
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/// @} group metaprogramming |
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_GLIBCXX_END_NAMESPACE_VERSION |
} |
} |
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#endif // _GLIBCXX_TR1_TYPE_TRAITS |