458 lines
13 KiB
C++
458 lines
13 KiB
C++
// TR1 type_traits -*- C++ -*-
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// Copyright (C) 2007 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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// 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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// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file tr1_impl/type_traits
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#include <tr1_impl/type_traitsfwd.h>
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namespace std
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{
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_GLIBCXX_BEGIN_NAMESPACE_TR1
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// For use in __is_convertible_simple.
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struct __sfinae_types
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{
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typedef char __one;
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typedef struct { char __arr[2]; } __two;
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};
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#define _DEFINE_SPEC_BODY(_Value) \
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: public integral_constant<bool, _Value> { };
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#define _DEFINE_SPEC_0_HELPER(_Spec, _Value) \
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template<> \
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struct _Spec \
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_DEFINE_SPEC_BODY(_Value)
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#define _DEFINE_SPEC_1_HELPER(_Spec, _Value) \
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template<typename _Tp> \
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struct _Spec \
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_DEFINE_SPEC_BODY(_Value)
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#define _DEFINE_SPEC_2_HELPER(_Spec, _Value) \
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template<typename _Tp, typename _Cp> \
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struct _Spec \
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_DEFINE_SPEC_BODY(_Value)
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#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \
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_DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type>, _Value) \
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_DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type const>, _Value) \
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_DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type volatile>, _Value) \
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_DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type const volatile>, _Value)
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/// @brief helper classes [4.3].
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template<typename _Tp, _Tp __v>
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struct integral_constant
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{
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static const _Tp value = __v;
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typedef _Tp value_type;
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typedef integral_constant<_Tp, __v> type;
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};
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typedef integral_constant<bool, true> true_type;
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typedef integral_constant<bool, false> false_type;
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template<typename _Tp, _Tp __v>
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const _Tp integral_constant<_Tp, __v>::value;
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/// @brief primary type categories [4.5.1].
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template<typename>
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struct is_void
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: public false_type { };
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_DEFINE_SPEC(0, is_void, void, true)
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template<typename>
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struct is_integral
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: public false_type { };
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_DEFINE_SPEC(0, is_integral, bool, true)
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_DEFINE_SPEC(0, is_integral, char, true)
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_DEFINE_SPEC(0, is_integral, signed char, true)
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_DEFINE_SPEC(0, is_integral, unsigned char, true)
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#ifdef _GLIBCXX_USE_WCHAR_T
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_DEFINE_SPEC(0, is_integral, wchar_t, true)
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#endif
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_DEFINE_SPEC(0, is_integral, short, true)
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_DEFINE_SPEC(0, is_integral, unsigned short, true)
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_DEFINE_SPEC(0, is_integral, int, true)
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_DEFINE_SPEC(0, is_integral, unsigned int, true)
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_DEFINE_SPEC(0, is_integral, long, true)
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_DEFINE_SPEC(0, is_integral, unsigned long, true)
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_DEFINE_SPEC(0, is_integral, long long, true)
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_DEFINE_SPEC(0, is_integral, unsigned long long, true)
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template<typename>
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struct is_floating_point
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: public false_type { };
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_DEFINE_SPEC(0, is_floating_point, float, true)
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_DEFINE_SPEC(0, is_floating_point, double, true)
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_DEFINE_SPEC(0, is_floating_point, long double, true)
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template<typename>
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struct is_array
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: public false_type { };
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template<typename _Tp, std::size_t _Size>
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struct is_array<_Tp[_Size]>
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: public true_type { };
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template<typename _Tp>
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struct is_array<_Tp[]>
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: public true_type { };
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template<typename>
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struct is_pointer
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: public false_type { };
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_DEFINE_SPEC(1, is_pointer, _Tp*, true)
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template<typename>
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struct is_member_object_pointer
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: public false_type { };
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_DEFINE_SPEC(2, is_member_object_pointer, _Tp _Cp::*,
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!is_function<_Tp>::value)
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template<typename>
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struct is_member_function_pointer
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: public false_type { };
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_DEFINE_SPEC(2, is_member_function_pointer, _Tp _Cp::*,
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is_function<_Tp>::value)
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template<typename _Tp>
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struct is_enum
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: public integral_constant<bool, __is_enum(_Tp)>
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{ };
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template<typename _Tp>
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struct is_union
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: public integral_constant<bool, __is_union(_Tp)>
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{ };
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template<typename _Tp>
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struct is_class
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: public integral_constant<bool, __is_class(_Tp)>
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{ };
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template<typename>
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struct __is_function_helper
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: public false_type { };
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template<typename _Res, typename... _ArgTypes>
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struct __is_function_helper<_Res(_ArgTypes...)>
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: public true_type { };
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template<typename _Res, typename... _ArgTypes>
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struct __is_function_helper<_Res(_ArgTypes......)>
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: public true_type { };
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template<typename _Tp>
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struct is_function
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: public integral_constant<bool, (__is_function_helper<typename
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remove_cv<_Tp>::type>::value)>
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{ };
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/// @brief composite type traits [4.5.2].
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template<typename _Tp>
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struct is_arithmetic
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: public integral_constant<bool, (is_integral<_Tp>::value
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|| is_floating_point<_Tp>::value)>
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{ };
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template<typename _Tp>
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struct is_fundamental
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: public integral_constant<bool, (is_arithmetic<_Tp>::value
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|| is_void<_Tp>::value)>
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{ };
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template<typename _Tp>
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struct is_object
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: public integral_constant<bool, !(is_function<_Tp>::value
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|| is_reference<_Tp>::value
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|| is_void<_Tp>::value)>
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{ };
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template<typename _Tp>
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struct is_scalar
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: public integral_constant<bool, (is_arithmetic<_Tp>::value
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|| is_enum<_Tp>::value
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|| is_pointer<_Tp>::value
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|| is_member_pointer<_Tp>::value)>
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{ };
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template<typename _Tp>
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struct is_compound
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: public integral_constant<bool, !is_fundamental<_Tp>::value> { };
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template<typename _Tp>
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struct is_member_pointer
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: public integral_constant<bool,
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(is_member_object_pointer<_Tp>::value
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|| is_member_function_pointer<_Tp>::value)>
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{ };
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/// @brief type properties [4.5.3].
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template<typename>
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struct is_const
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: public false_type { };
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template<typename _Tp>
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struct is_const<_Tp const>
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: public true_type { };
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template<typename>
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struct is_volatile
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: public false_type { };
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template<typename _Tp>
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struct is_volatile<_Tp volatile>
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: public true_type { };
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template<typename _Tp>
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struct is_empty
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: public integral_constant<bool, __is_empty(_Tp)>
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{ };
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template<typename _Tp>
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struct is_polymorphic
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: public integral_constant<bool, __is_polymorphic(_Tp)>
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{ };
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template<typename _Tp>
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struct is_abstract
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: public integral_constant<bool, __is_abstract(_Tp)>
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{ };
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template<typename _Tp>
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struct has_virtual_destructor
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: public integral_constant<bool, __has_virtual_destructor(_Tp)>
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{ };
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template<typename _Tp>
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struct alignment_of
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: public integral_constant<std::size_t, __alignof__(_Tp)> { };
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template<typename>
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struct rank
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: public integral_constant<std::size_t, 0> { };
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template<typename _Tp, std::size_t _Size>
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struct rank<_Tp[_Size]>
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: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
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template<typename _Tp>
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struct rank<_Tp[]>
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: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
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template<typename, unsigned>
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struct extent
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: public integral_constant<std::size_t, 0> { };
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template<typename _Tp, unsigned _Uint, std::size_t _Size>
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struct extent<_Tp[_Size], _Uint>
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: public integral_constant<std::size_t,
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_Uint == 0 ? _Size : extent<_Tp,
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_Uint - 1>::value>
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{ };
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template<typename _Tp, unsigned _Uint>
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struct extent<_Tp[], _Uint>
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: public integral_constant<std::size_t,
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_Uint == 0 ? 0 : extent<_Tp,
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_Uint - 1>::value>
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{ };
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/// @brief relationships between types [4.6].
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template<typename, typename>
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struct is_same
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: public false_type { };
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template<typename _Tp>
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struct is_same<_Tp, _Tp>
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: public true_type { };
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/// @brief const-volatile modifications [4.7.1].
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template<typename _Tp>
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struct remove_const
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{ typedef _Tp type; };
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template<typename _Tp>
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struct remove_const<_Tp const>
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{ typedef _Tp type; };
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template<typename _Tp>
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struct remove_volatile
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{ typedef _Tp type; };
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template<typename _Tp>
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struct remove_volatile<_Tp volatile>
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{ typedef _Tp type; };
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template<typename _Tp>
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struct remove_cv
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{
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typedef typename
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remove_const<typename remove_volatile<_Tp>::type>::type type;
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};
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template<typename _Tp>
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struct add_const
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{ typedef _Tp const type; };
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template<typename _Tp>
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struct add_volatile
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{ typedef _Tp volatile type; };
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template<typename _Tp>
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struct add_cv
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{
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typedef typename
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add_const<typename add_volatile<_Tp>::type>::type type;
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};
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/// @brief array modifications [4.7.3].
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template<typename _Tp>
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struct remove_extent
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{ typedef _Tp type; };
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template<typename _Tp, std::size_t _Size>
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struct remove_extent<_Tp[_Size]>
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{ typedef _Tp type; };
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template<typename _Tp>
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struct remove_extent<_Tp[]>
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{ typedef _Tp type; };
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template<typename _Tp>
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struct remove_all_extents
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{ typedef _Tp type; };
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template<typename _Tp, std::size_t _Size>
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struct remove_all_extents<_Tp[_Size]>
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{ typedef typename remove_all_extents<_Tp>::type type; };
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template<typename _Tp>
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struct remove_all_extents<_Tp[]>
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{ typedef typename remove_all_extents<_Tp>::type type; };
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/// @brief pointer modifications [4.7.4].
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#undef _DEFINE_SPEC_BODY
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#define _DEFINE_SPEC_BODY(_Value) \
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{ typedef _Tp type; };
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template<typename _Tp>
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struct remove_pointer
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{ typedef _Tp type; };
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_DEFINE_SPEC(1, remove_pointer, _Tp*, false)
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template<typename _Tp>
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struct add_pointer
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{ typedef typename remove_reference<_Tp>::type* type; };
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/// @brief other transformations [4.8].
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// Due to c++/19163 and c++/17743, for the time being we cannot use
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// the correct, neat implementation :-(
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//
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// template<std::size_t _Len, std::size_t _Align>
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// struct aligned_storage
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// { typedef char type[_Len] __attribute__((__aligned__(_Align))); }
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//
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// Temporary workaround, useful for Align up to 32:
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template<std::size_t, std::size_t>
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struct aligned_storage { };
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template<std::size_t _Len>
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struct aligned_storage<_Len, 1>
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{
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union type
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{
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unsigned char __data[_Len];
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char __align __attribute__((__aligned__(1)));
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};
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};
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template<std::size_t _Len>
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struct aligned_storage<_Len, 2>
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{
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union type
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{
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unsigned char __data[_Len];
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char __align __attribute__((__aligned__(2)));
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};
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};
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template<std::size_t _Len>
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struct aligned_storage<_Len, 4>
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{
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union type
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{
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unsigned char __data[_Len];
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char __align __attribute__((__aligned__(4)));
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};
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};
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template<std::size_t _Len>
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struct aligned_storage<_Len, 8>
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{
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union type
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{
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unsigned char __data[_Len];
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char __align __attribute__((__aligned__(8)));
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};
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};
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template<std::size_t _Len>
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struct aligned_storage<_Len, 16>
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{
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union type
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{
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unsigned char __data[_Len];
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char __align __attribute__((__aligned__(16)));
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};
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};
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template<std::size_t _Len>
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struct aligned_storage<_Len, 32>
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{
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union type
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{
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unsigned char __data[_Len];
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char __align __attribute__((__aligned__(32)));
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};
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};
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#undef _DEFINE_SPEC_0_HELPER
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#undef _DEFINE_SPEC_1_HELPER
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#undef _DEFINE_SPEC_2_HELPER
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#undef _DEFINE_SPEC
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#undef _DEFINE_SPEC_BODY
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_GLIBCXX_END_NAMESPACE_TR1
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}
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