// TR1 type_traits -*- C++ -*-
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// TR1 type_traits -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
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// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
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//
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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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// 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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// 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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// 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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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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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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// 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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// 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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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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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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// 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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// 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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// 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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// 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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// 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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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// .
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// .
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/** @file tr1_impl/type_traits
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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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* 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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* You should not attempt to use it directly.
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*/
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*/
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namespace std
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namespace std
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{
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{
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_GLIBCXX_BEGIN_NAMESPACE_TR1
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_GLIBCXX_BEGIN_NAMESPACE_TR1
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/**
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/**
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* @defgroup metaprogramming Type Traits
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* @defgroup metaprogramming Type Traits
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* @ingroup utilities
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* @ingroup utilities
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*
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*
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* Compile time type transformation and information.
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* Compile time type transformation and information.
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* @{
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* @{
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*/
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*/
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// For use in __is_convertible_simple.
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// For use in __is_convertible_simple.
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struct __sfinae_types
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struct __sfinae_types
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{
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{
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typedef char __one;
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typedef char __one;
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typedef struct { char __arr[2]; } __two;
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typedef struct { char __arr[2]; } __two;
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};
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};
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#define _DEFINE_SPEC_0_HELPER \
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#define _DEFINE_SPEC_0_HELPER \
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template<>
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template<>
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#define _DEFINE_SPEC_1_HELPER \
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#define _DEFINE_SPEC_1_HELPER \
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template
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template
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#define _DEFINE_SPEC_2_HELPER \
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#define _DEFINE_SPEC_2_HELPER \
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template
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template
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#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \
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#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \
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_DEFINE_SPEC_##_Order##_HELPER \
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_DEFINE_SPEC_##_Order##_HELPER \
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struct _Trait<_Type> \
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struct _Trait<_Type> \
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: public integral_constant { };
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: public integral_constant { };
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// helper classes [4.3].
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// helper classes [4.3].
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/// integral_constant
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/// integral_constant
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template
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template
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struct integral_constant
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struct integral_constant
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{
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{
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static const _Tp value = __v;
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static const _Tp value = __v;
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typedef _Tp value_type;
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typedef _Tp value_type;
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typedef integral_constant<_Tp, __v> type;
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typedef integral_constant<_Tp, __v> type;
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};
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};
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/// typedef for true_type
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/// typedef for true_type
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typedef integral_constant true_type;
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typedef integral_constant true_type;
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/// typedef for false_type
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/// typedef for false_type
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typedef integral_constant false_type;
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typedef integral_constant false_type;
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template
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template
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const _Tp integral_constant<_Tp, __v>::value;
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const _Tp integral_constant<_Tp, __v>::value;
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/// remove_cv
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/// remove_cv
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template
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template
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struct remove_cv;
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struct remove_cv;
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template
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template
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struct __is_void_helper
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struct __is_void_helper
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: public false_type { };
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: public false_type { };
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_DEFINE_SPEC(0, __is_void_helper, void, true)
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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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// primary type categories [4.5.1].
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/// is_void
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/// is_void
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template
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template
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struct is_void
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struct is_void
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: public integral_constant
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: public integral_constant
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remove_cv<_Tp>::type>::value)>
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remove_cv<_Tp>::type>::value)>
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{ };
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{ };
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template
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template
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struct __is_integral_helper
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struct __is_integral_helper
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: public false_type { };
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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, bool, true)
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_DEFINE_SPEC(0, __is_integral_helper, char, 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, signed char, true)
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_DEFINE_SPEC(0, __is_integral_helper, unsigned 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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#ifdef _GLIBCXX_USE_WCHAR_T
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_DEFINE_SPEC(0, __is_integral_helper, wchar_t, true)
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_DEFINE_SPEC(0, __is_integral_helper, wchar_t, true)
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#endif
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#endif
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#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
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#ifdef _GLIBCXX_INCLUDE_AS_CXX0X
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_DEFINE_SPEC(0, __is_integral_helper, char16_t, true)
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_DEFINE_SPEC(0, __is_integral_helper, char16_t, true)
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_DEFINE_SPEC(0, __is_integral_helper, char32_t, true)
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_DEFINE_SPEC(0, __is_integral_helper, char32_t, true)
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#endif
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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, 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, 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, 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, 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, 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, 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, long long, true)
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_DEFINE_SPEC(0, __is_integral_helper, unsigned 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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/// is_integral
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template
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template
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struct is_integral
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struct is_integral
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: public integral_constant
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: public integral_constant
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remove_cv<_Tp>::type>::value)>
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remove_cv<_Tp>::type>::value)>
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{ };
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{ };
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template
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template
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struct __is_floating_point_helper
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struct __is_floating_point_helper
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: public false_type { };
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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, 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, double, true)
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_DEFINE_SPEC(0, __is_floating_point_helper, long 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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/// is_floating_point
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template
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template
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struct is_floating_point
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struct is_floating_point
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: public integral_constant
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: public integral_constant
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remove_cv<_Tp>::type>::value)>
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remove_cv<_Tp>::type>::value)>
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{ };
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{ };
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/// is_array
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/// is_array
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template
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template
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struct is_array
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struct is_array
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: public false_type { };
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: public false_type { };
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template
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template
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struct is_array<_Tp[_Size]>
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struct is_array<_Tp[_Size]>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_array<_Tp[]>
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struct is_array<_Tp[]>
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: public true_type { };
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: public true_type { };
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template
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template
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struct __is_pointer_helper
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struct __is_pointer_helper
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: public false_type { };
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: public false_type { };
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_DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true)
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_DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true)
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/// is_pointer
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/// is_pointer
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template
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template
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struct is_pointer
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struct is_pointer
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: public integral_constant
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: public integral_constant
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remove_cv<_Tp>::type>::value)>
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remove_cv<_Tp>::type>::value)>
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{ };
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{ };
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/// is_reference
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/// is_reference
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template
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template
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struct is_reference;
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struct is_reference;
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/// is_function
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/// is_function
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template
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template
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struct is_function;
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struct is_function;
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template
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template
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struct __is_member_object_pointer_helper
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struct __is_member_object_pointer_helper
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: public false_type { };
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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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_DEFINE_SPEC(2, __is_member_object_pointer_helper, _Tp _Cp::*,
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!is_function<_Tp>::value)
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!is_function<_Tp>::value)
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/// is_member_object_pointer
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/// is_member_object_pointer
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template
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template
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struct is_member_object_pointer
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struct is_member_object_pointer
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: public integral_constant
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: public integral_constant
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typename remove_cv<_Tp>::type>::value)>
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typename remove_cv<_Tp>::type>::value)>
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{ };
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{ };
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template
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template
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struct __is_member_function_pointer_helper
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struct __is_member_function_pointer_helper
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: public false_type { };
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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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_DEFINE_SPEC(2, __is_member_function_pointer_helper, _Tp _Cp::*,
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is_function<_Tp>::value)
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is_function<_Tp>::value)
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/// is_member_function_pointer
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/// is_member_function_pointer
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template
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template
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struct is_member_function_pointer
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struct is_member_function_pointer
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: public integral_constant
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: public integral_constant
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typename remove_cv<_Tp>::type>::value)>
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typename remove_cv<_Tp>::type>::value)>
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{ };
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{ };
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/// is_enum
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/// is_enum
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template
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template
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struct is_enum
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struct is_enum
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: public integral_constant
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: public integral_constant
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{ };
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{ };
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/// is_union
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/// is_union
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template
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template
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struct is_union
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struct is_union
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: public integral_constant
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: public integral_constant
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{ };
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{ };
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/// is_class
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/// is_class
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template
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template
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struct is_class
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struct is_class
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: public integral_constant
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: public integral_constant
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{ };
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{ };
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/// is_function
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/// is_function
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template
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template
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struct is_function
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struct is_function
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: public false_type { };
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: public false_type { };
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template
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template
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struct is_function<_Res(_ArgTypes...)>
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struct is_function<_Res(_ArgTypes...)>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_function<_Res(_ArgTypes......)>
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struct is_function<_Res(_ArgTypes......)>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_function<_Res(_ArgTypes...) const>
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struct is_function<_Res(_ArgTypes...) const>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_function<_Res(_ArgTypes......) const>
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struct is_function<_Res(_ArgTypes......) const>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_function<_Res(_ArgTypes...) volatile>
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struct is_function<_Res(_ArgTypes...) volatile>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_function<_Res(_ArgTypes......) volatile>
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struct is_function<_Res(_ArgTypes......) volatile>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_function<_Res(_ArgTypes...) const volatile>
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struct is_function<_Res(_ArgTypes...) const volatile>
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: public true_type { };
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: public true_type { };
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template
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template
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struct is_function<_Res(_ArgTypes......) const volatile>
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struct is_function<_Res(_ArgTypes......) const volatile>
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: public true_type { };
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: public true_type { };
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// composite type traits [4.5.2].
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// composite type traits [4.5.2].
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/// is_arithmetic
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/// is_arithmetic
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template
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template
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struct is_arithmetic
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struct is_arithmetic
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: public integral_constant::value
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: public integral_constant::value
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|| is_floating_point<_Tp>::value)>
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|| is_floating_point<_Tp>::value)>
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{ };
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{ };
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/// is_fundamental
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/// is_fundamental
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template
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template
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struct is_fundamental
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struct is_fundamental
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: public integral_constant::value
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: public integral_constant::value
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|| is_void<_Tp>::value)>
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|| is_void<_Tp>::value)>
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{ };
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{ };
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/// is_object
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/// is_object
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template
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template
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struct is_object
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struct is_object
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: public integral_constant::value
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: public integral_constant::value
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|| is_reference<_Tp>::value
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|| is_reference<_Tp>::value
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|| is_void<_Tp>::value)>
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|| is_void<_Tp>::value)>
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{ };
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{ };
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/// is_member_pointer
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/// is_member_pointer
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template
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template
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struct is_member_pointer;
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struct is_member_pointer;
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/// is_scalar
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/// is_scalar
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template
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template
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struct is_scalar
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struct is_scalar
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: public integral_constant::value
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: public integral_constant::value
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|| is_enum<_Tp>::value
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|| is_enum<_Tp>::value
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|| is_pointer<_Tp>::value
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|| is_pointer<_Tp>::value
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|| is_member_pointer<_Tp>::value)>
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|| is_member_pointer<_Tp>::value)>
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{ };
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{ };
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/// is_compound
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/// is_compound
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template
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template
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struct is_compound
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struct is_compound
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: public integral_constant::value> { };
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: public integral_constant::value> { };
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/// is_member_pointer
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/// is_member_pointer
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template
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template
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struct __is_member_pointer_helper
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struct __is_member_pointer_helper
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: public false_type { };
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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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_DEFINE_SPEC(2, __is_member_pointer_helper, _Tp _Cp::*, true)
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template
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template
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struct is_member_pointer
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struct is_member_pointer
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: public integral_constant
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: public integral_constant
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typename remove_cv<_Tp>::type>::value)>
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typename remove_cv<_Tp>::type>::value)>
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{ };
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{ };
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// type properties [4.5.3].
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// type properties [4.5.3].
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/// is_const
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/// is_const
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template
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template
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struct is_const
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struct is_const
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: public false_type { };
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: public false_type { };
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|
|
template
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template
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struct is_const<_Tp const>
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struct is_const<_Tp const>
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: public true_type { };
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: public true_type { };
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/// is_volatile
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/// is_volatile
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template
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template
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struct is_volatile
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struct is_volatile
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: public false_type { };
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: public false_type { };
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|
|
template
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template
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struct is_volatile<_Tp volatile>
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struct is_volatile<_Tp volatile>
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: public true_type { };
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: public true_type { };
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|
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/// is_empty
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/// is_empty
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template
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template
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struct is_empty
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struct is_empty
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: public integral_constant
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: public integral_constant
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{ };
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{ };
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|
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/// is_polymorphic
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/// is_polymorphic
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template
|
template
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struct is_polymorphic
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struct is_polymorphic
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: public integral_constant
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: public integral_constant
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{ };
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{ };
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|
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/// is_abstract
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/// is_abstract
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template
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template
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struct is_abstract
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struct is_abstract
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: public integral_constant
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: public integral_constant
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{ };
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{ };
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|
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/// has_virtual_destructor
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/// has_virtual_destructor
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template
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template
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struct has_virtual_destructor
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struct has_virtual_destructor
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: public integral_constant
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: public integral_constant
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{ };
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{ };
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|
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/// alignment_of
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/// alignment_of
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template
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template
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struct alignment_of
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struct alignment_of
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: public integral_constant { };
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: public integral_constant { };
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|
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/// rank
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/// rank
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template
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template
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struct rank
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struct rank
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: public integral_constant { };
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: public integral_constant { };
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|
|
template
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template
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struct rank<_Tp[_Size]>
|
struct rank<_Tp[_Size]>
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: public integral_constant::value> { };
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: public integral_constant::value> { };
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|
|
template
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template
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struct rank<_Tp[]>
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struct rank<_Tp[]>
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: public integral_constant::value> { };
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: public integral_constant::value> { };
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|
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/// extent
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/// extent
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template
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template
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struct extent
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struct extent
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: public integral_constant { };
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: public integral_constant { };
|
|
|
template
|
template
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struct extent<_Tp[_Size], _Uint>
|
struct extent<_Tp[_Size], _Uint>
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: public integral_constant
|
: public integral_constant
|
_Uint == 0 ? _Size : extent<_Tp,
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_Uint == 0 ? _Size : extent<_Tp,
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_Uint - 1>::value>
|
_Uint - 1>::value>
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{ };
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{ };
|
|
|
template
|
template
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struct extent<_Tp[], _Uint>
|
struct extent<_Tp[], _Uint>
|
: public integral_constant
|
: public integral_constant
|
_Uint == 0 ? 0 : extent<_Tp,
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_Uint == 0 ? 0 : extent<_Tp,
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_Uint - 1>::value>
|
_Uint - 1>::value>
|
{ };
|
{ };
|
|
|
// relationships between types [4.6].
|
// relationships between types [4.6].
|
|
|
/// is_same
|
/// is_same
|
template
|
template
|
struct is_same
|
struct is_same
|
: public false_type { };
|
: public false_type { };
|
|
|
template
|
template
|
struct is_same<_Tp, _Tp>
|
struct is_same<_Tp, _Tp>
|
: public true_type { };
|
: public true_type { };
|
|
|
// const-volatile modifications [4.7.1].
|
// const-volatile modifications [4.7.1].
|
|
|
/// remove_const
|
/// remove_const
|
template
|
template
|
struct remove_const
|
struct remove_const
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
template
|
template
|
struct remove_const<_Tp const>
|
struct remove_const<_Tp const>
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
/// remove_volatile
|
/// remove_volatile
|
template
|
template
|
struct remove_volatile
|
struct remove_volatile
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
template
|
template
|
struct remove_volatile<_Tp volatile>
|
struct remove_volatile<_Tp volatile>
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
/// remove_cv
|
/// remove_cv
|
template
|
template
|
struct remove_cv
|
struct remove_cv
|
{
|
{
|
typedef typename
|
typedef typename
|
remove_const::type>::type type;
|
remove_const::type>::type type;
|
};
|
};
|
|
|
/// add_const
|
/// add_const
|
template
|
template
|
struct add_const
|
struct add_const
|
{ typedef _Tp const type; };
|
{ typedef _Tp const type; };
|
|
|
/// add_volatile
|
/// add_volatile
|
template
|
template
|
struct add_volatile
|
struct add_volatile
|
{ typedef _Tp volatile type; };
|
{ typedef _Tp volatile type; };
|
|
|
/// add_cv
|
/// add_cv
|
template
|
template
|
struct add_cv
|
struct add_cv
|
{
|
{
|
typedef typename
|
typedef typename
|
add_const::type>::type type;
|
add_const::type>::type type;
|
};
|
};
|
|
|
// array modifications [4.7.3].
|
// array modifications [4.7.3].
|
|
|
/// remove_extent
|
/// remove_extent
|
template
|
template
|
struct remove_extent
|
struct remove_extent
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
template
|
template
|
struct remove_extent<_Tp[_Size]>
|
struct remove_extent<_Tp[_Size]>
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
template
|
template
|
struct remove_extent<_Tp[]>
|
struct remove_extent<_Tp[]>
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
/// remove_all_extents
|
/// remove_all_extents
|
template
|
template
|
struct remove_all_extents
|
struct remove_all_extents
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
template
|
template
|
struct remove_all_extents<_Tp[_Size]>
|
struct remove_all_extents<_Tp[_Size]>
|
{ typedef typename remove_all_extents<_Tp>::type type; };
|
{ typedef typename remove_all_extents<_Tp>::type type; };
|
|
|
template
|
template
|
struct remove_all_extents<_Tp[]>
|
struct remove_all_extents<_Tp[]>
|
{ typedef typename remove_all_extents<_Tp>::type type; };
|
{ typedef typename remove_all_extents<_Tp>::type type; };
|
|
|
// pointer modifications [4.7.4].
|
// pointer modifications [4.7.4].
|
|
|
template
|
template
|
struct __remove_pointer_helper
|
struct __remove_pointer_helper
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
template
|
template
|
struct __remove_pointer_helper<_Tp, _Up*>
|
struct __remove_pointer_helper<_Tp, _Up*>
|
{ typedef _Up type; };
|
{ typedef _Up type; };
|
|
|
/// remove_pointer
|
/// remove_pointer
|
template
|
template
|
struct remove_pointer
|
struct remove_pointer
|
: public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
|
: public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
|
{ };
|
{ };
|
|
|
template
|
template
|
struct remove_reference;
|
struct remove_reference;
|
|
|
/// add_pointer
|
/// add_pointer
|
template
|
template
|
struct add_pointer
|
struct add_pointer
|
{ typedef typename remove_reference<_Tp>::type* type; };
|
{ typedef typename remove_reference<_Tp>::type* type; };
|
|
|
#undef _DEFINE_SPEC_0_HELPER
|
#undef _DEFINE_SPEC_0_HELPER
|
#undef _DEFINE_SPEC_1_HELPER
|
#undef _DEFINE_SPEC_1_HELPER
|
#undef _DEFINE_SPEC_2_HELPER
|
#undef _DEFINE_SPEC_2_HELPER
|
#undef _DEFINE_SPEC
|
#undef _DEFINE_SPEC
|
|
|
// @} group metaprogramming
|
// @} group metaprogramming
|
|
|
_GLIBCXX_END_NAMESPACE_TR1
|
_GLIBCXX_END_NAMESPACE_TR1
|
}
|
}
|
|
|
