688 lines
19 KiB
C++
688 lines
19 KiB
C++
// TR1 type_traits -*- C++ -*-
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// Copyright (C) 2004-2013 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 3, 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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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 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
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file tr1/type_traits
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* This is a TR1 C++ Library header.
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*/
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#ifndef _GLIBCXX_TR1_TYPE_TRAITS
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#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)
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{
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namespace tr1
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @addtogroup metaprogramming
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* @{
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*/
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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_0_HELPER \
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template<>
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#define _DEFINE_SPEC_1_HELPER \
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template<typename _Tp>
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#define _DEFINE_SPEC_2_HELPER \
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template<typename _Tp, typename _Cp>
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#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \
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_DEFINE_SPEC_##_Order##_HELPER \
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struct _Trait<_Type> \
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: public integral_constant<bool, _Value> { };
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// helper classes [4.3].
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/// integral_constant
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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 for true_type
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typedef integral_constant<bool, true> true_type;
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/// typedef for false_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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/// remove_cv
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template<typename>
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struct remove_cv;
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template<typename>
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struct __is_void_helper
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: public false_type { };
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_DEFINE_SPEC(0, __is_void_helper, void, true)
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// primary type categories [4.5.1].
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/// is_void
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template<typename _Tp>
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struct is_void
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: public integral_constant<bool, (__is_void_helper<typename
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remove_cv<_Tp>::type>::value)>
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{ };
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template<typename>
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struct __is_integral_helper
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: public false_type { };
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_DEFINE_SPEC(0, __is_integral_helper, bool, true)
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_DEFINE_SPEC(0, __is_integral_helper, char, true)
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_DEFINE_SPEC(0, __is_integral_helper, signed char, true)
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_DEFINE_SPEC(0, __is_integral_helper, unsigned char, true)
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#ifdef _GLIBCXX_USE_WCHAR_T
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_DEFINE_SPEC(0, __is_integral_helper, wchar_t, true)
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#endif
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_DEFINE_SPEC(0, __is_integral_helper, short, true)
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_DEFINE_SPEC(0, __is_integral_helper, unsigned short, true)
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_DEFINE_SPEC(0, __is_integral_helper, int, true)
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_DEFINE_SPEC(0, __is_integral_helper, unsigned int, true)
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_DEFINE_SPEC(0, __is_integral_helper, long, true)
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_DEFINE_SPEC(0, __is_integral_helper, unsigned long, true)
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_DEFINE_SPEC(0, __is_integral_helper, long long, true)
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_DEFINE_SPEC(0, __is_integral_helper, unsigned long long, true)
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/// is_integral
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template<typename _Tp>
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struct is_integral
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: public integral_constant<bool, (__is_integral_helper<typename
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remove_cv<_Tp>::type>::value)>
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{ };
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template<typename>
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struct __is_floating_point_helper
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: public false_type { };
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_DEFINE_SPEC(0, __is_floating_point_helper, float, true)
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_DEFINE_SPEC(0, __is_floating_point_helper, double, true)
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_DEFINE_SPEC(0, __is_floating_point_helper, long double, true)
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/// is_floating_point
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template<typename _Tp>
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struct is_floating_point
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: public integral_constant<bool, (__is_floating_point_helper<typename
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remove_cv<_Tp>::type>::value)>
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{ };
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/// is_array
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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_helper
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: public false_type { };
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_DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true)
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/// is_pointer
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template<typename _Tp>
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struct is_pointer
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: public integral_constant<bool, (__is_pointer_helper<typename
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remove_cv<_Tp>::type>::value)>
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{ };
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/// is_reference
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template<typename _Tp>
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struct is_reference;
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/// is_function
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template<typename _Tp>
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struct is_function;
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template<typename>
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struct __is_member_object_pointer_helper
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: public false_type { };
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_DEFINE_SPEC(2, __is_member_object_pointer_helper, _Tp _Cp::*,
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!is_function<_Tp>::value)
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/// is_member_object_pointer
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template<typename _Tp>
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struct is_member_object_pointer
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: public integral_constant<bool, (__is_member_object_pointer_helper<
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typename remove_cv<_Tp>::type>::value)>
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{ };
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template<typename>
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struct __is_member_function_pointer_helper
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: public false_type { };
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_DEFINE_SPEC(2, __is_member_function_pointer_helper, _Tp _Cp::*,
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is_function<_Tp>::value)
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/// is_member_function_pointer
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template<typename _Tp>
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struct is_member_function_pointer
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: public integral_constant<bool, (__is_member_function_pointer_helper<
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typename remove_cv<_Tp>::type>::value)>
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{ };
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/// is_enum
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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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/// is_union
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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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/// is_class
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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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/// is_function
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template<typename>
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struct is_function
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: public false_type { };
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template<typename _Res, typename... _ArgTypes>
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struct is_function<_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<_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<_Res(_ArgTypes...) const>
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: public true_type { };
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template<typename _Res, typename... _ArgTypes>
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struct is_function<_Res(_ArgTypes......) const>
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: public true_type { };
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template<typename _Res, typename... _ArgTypes>
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struct is_function<_Res(_ArgTypes...) volatile>
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: public true_type { };
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template<typename _Res, typename... _ArgTypes>
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struct is_function<_Res(_ArgTypes......) volatile>
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: public true_type { };
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template<typename _Res, typename... _ArgTypes>
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struct is_function<_Res(_ArgTypes...) const volatile>
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: public true_type { };
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template<typename _Res, typename... _ArgTypes>
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struct is_function<_Res(_ArgTypes......) const volatile>
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: public true_type { };
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// composite type traits [4.5.2].
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/// is_arithmetic
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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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/// is_fundamental
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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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/// is_object
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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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/// is_member_pointer
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template<typename _Tp>
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struct is_member_pointer;
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/// is_scalar
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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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/// is_compound
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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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/// is_member_pointer
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template<typename _Tp>
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struct __is_member_pointer_helper
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: public false_type { };
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_DEFINE_SPEC(2, __is_member_pointer_helper, _Tp _Cp::*, true)
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template<typename _Tp>
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struct is_member_pointer
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: public integral_constant<bool, (__is_member_pointer_helper<
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typename remove_cv<_Tp>::type>::value)>
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{ };
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// type properties [4.5.3].
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/// is_const
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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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/// is_volatile
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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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/// is_empty
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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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/// is_polymorphic
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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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/// is_abstract
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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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/// has_virtual_destructor
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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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/// alignment_of
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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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/// rank
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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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/// extent
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template<typename, unsigned _Uint = 0>
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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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// relationships between types [4.6].
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/// is_same
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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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// const-volatile modifications [4.7.1].
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/// remove_const
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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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/// remove_volatile
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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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/// remove_cv
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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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/// add_const
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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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/// add_volatile
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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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/// add_cv
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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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// array modifications [4.7.3].
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/// remove_extent
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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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/// remove_all_extents
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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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// pointer modifications [4.7.4].
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template<typename _Tp, typename>
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struct __remove_pointer_helper
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{ typedef _Tp type; };
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template<typename _Tp, typename _Up>
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struct __remove_pointer_helper<_Tp, _Up*>
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{ typedef _Up type; };
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/// remove_pointer
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template<typename _Tp>
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struct remove_pointer
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: public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
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{ };
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template<typename>
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struct remove_reference;
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/// add_pointer
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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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template<typename>
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struct is_reference
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: public false_type { };
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template<typename _Tp>
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struct is_reference<_Tp&>
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: public true_type { };
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template<typename _Tp>
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struct is_pod
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: public integral_constant<bool, __is_pod(_Tp) || is_void<_Tp>::value>
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{ };
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template<typename _Tp>
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struct has_trivial_constructor
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: public integral_constant<bool, is_pod<_Tp>::value>
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{ };
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template<typename _Tp>
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struct has_trivial_copy
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: public integral_constant<bool, is_pod<_Tp>::value>
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{ };
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template<typename _Tp>
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struct has_trivial_assign
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: public integral_constant<bool, is_pod<_Tp>::value>
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{ };
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template<typename _Tp>
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struct has_trivial_destructor
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: public integral_constant<bool, is_pod<_Tp>::value>
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{ };
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template<typename _Tp>
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struct has_nothrow_constructor
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: public integral_constant<bool, is_pod<_Tp>::value>
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{ };
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template<typename _Tp>
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struct has_nothrow_copy
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: public integral_constant<bool, is_pod<_Tp>::value>
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{ };
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template<typename _Tp>
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struct has_nothrow_assign
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: public integral_constant<bool, is_pod<_Tp>::value>
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{ };
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template<typename>
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struct __is_signed_helper
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: public false_type { };
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_DEFINE_SPEC(0, __is_signed_helper, signed char, true)
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_DEFINE_SPEC(0, __is_signed_helper, short, true)
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_DEFINE_SPEC(0, __is_signed_helper, int, true)
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_DEFINE_SPEC(0, __is_signed_helper, long, true)
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_DEFINE_SPEC(0, __is_signed_helper, long long, true)
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template<typename _Tp>
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struct is_signed
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: public integral_constant<bool, (__is_signed_helper<typename
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remove_cv<_Tp>::type>::value)>
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{ };
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template<typename>
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struct __is_unsigned_helper
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: public false_type { };
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_DEFINE_SPEC(0, __is_unsigned_helper, unsigned char, true)
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_DEFINE_SPEC(0, __is_unsigned_helper, unsigned short, true)
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|
_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)
|
|
|
|
template<typename _Tp>
|
|
struct is_unsigned
|
|
: public integral_constant<bool, (__is_unsigned_helper<typename
|
|
remove_cv<_Tp>::type>::value)>
|
|
{ };
|
|
|
|
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));
|
|
};
|
|
|
|
template<typename _Base, typename _Derived>
|
|
struct is_base_of
|
|
: public integral_constant<bool,
|
|
__is_base_of_helper<_Base, _Derived>::__value>
|
|
{ };
|
|
|
|
template<typename _From, typename _To>
|
|
struct __is_convertible_simple
|
|
: public __sfinae_types
|
|
{
|
|
private:
|
|
static __one __test(_To);
|
|
static __two __test(...);
|
|
static _From __makeFrom();
|
|
|
|
public:
|
|
static const bool __value = sizeof(__test(__makeFrom())) == 1;
|
|
};
|
|
|
|
template<typename _Tp>
|
|
struct add_reference;
|
|
|
|
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));
|
|
};
|
|
|
|
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);
|
|
};
|
|
|
|
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)); };
|
|
|
|
template<typename _From, typename _To>
|
|
struct is_convertible
|
|
: public integral_constant<bool,
|
|
__is_convertible_helper<_From, _To>::__value>
|
|
{ };
|
|
|
|
// reference modifications [4.7.2].
|
|
template<typename _Tp>
|
|
struct remove_reference
|
|
{ typedef _Tp type; };
|
|
|
|
template<typename _Tp>
|
|
struct remove_reference<_Tp&>
|
|
{ typedef _Tp type; };
|
|
|
|
// 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; };
|
|
|
|
template<typename _Tp>
|
|
struct __add_reference_helper<_Tp, true>
|
|
{ typedef _Tp type; };
|
|
|
|
template<typename _Tp>
|
|
struct add_reference
|
|
: public __add_reference_helper<_Tp>
|
|
{ };
|
|
|
|
// 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;
|
|
};
|
|
};
|
|
|
|
#undef _DEFINE_SPEC_0_HELPER
|
|
#undef _DEFINE_SPEC_1_HELPER
|
|
#undef _DEFINE_SPEC_2_HELPER
|
|
#undef _DEFINE_SPEC
|
|
|
|
/// @} group metaprogramming
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
}
|
|
}
|
|
|
|
#endif // _GLIBCXX_TR1_TYPE_TRAITS
|