// C++0x type_traits -*- C++ -*-
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// C++0x type_traits -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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// Copyright (C) 2007, 2008, 2009, 2010 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 include/type_traits
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/** @file include/type_traits
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* This is a Standard C++ Library header.
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* This is a Standard C++ Library header.
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*/
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*/
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#ifndef _GLIBCXX_TYPE_TRAITS
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#ifndef _GLIBCXX_TYPE_TRAITS
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#define _GLIBCXX_TYPE_TRAITS 1
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#define _GLIBCXX_TYPE_TRAITS 1
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#pragma GCC system_header
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#pragma GCC system_header
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#ifndef __GXX_EXPERIMENTAL_CXX0X__
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#ifndef __GXX_EXPERIMENTAL_CXX0X__
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# include
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# include
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#else
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#else
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#if defined(_GLIBCXX_INCLUDE_AS_TR1)
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#if defined(_GLIBCXX_INCLUDE_AS_TR1)
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# error C++0x header cannot be included from TR1 header
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# error C++0x header cannot be included from TR1 header
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#endif
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#endif
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#include
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#include
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#if defined(_GLIBCXX_INCLUDE_AS_CXX0X)
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#if defined(_GLIBCXX_INCLUDE_AS_CXX0X)
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# include
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# include
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#else
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#else
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# define _GLIBCXX_INCLUDE_AS_CXX0X
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# define _GLIBCXX_INCLUDE_AS_CXX0X
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# define _GLIBCXX_BEGIN_NAMESPACE_TR1
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# define _GLIBCXX_BEGIN_NAMESPACE_TR1
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# define _GLIBCXX_END_NAMESPACE_TR1
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# define _GLIBCXX_END_NAMESPACE_TR1
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# define _GLIBCXX_TR1
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# define _GLIBCXX_TR1
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# include
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# include
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# undef _GLIBCXX_TR1
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# undef _GLIBCXX_TR1
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# undef _GLIBCXX_END_NAMESPACE_TR1
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# undef _GLIBCXX_END_NAMESPACE_TR1
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# undef _GLIBCXX_BEGIN_NAMESPACE_TR1
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# undef _GLIBCXX_BEGIN_NAMESPACE_TR1
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# undef _GLIBCXX_INCLUDE_AS_CXX0X
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# undef _GLIBCXX_INCLUDE_AS_CXX0X
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#endif
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#endif
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namespace std
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namespace std
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{
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{
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/**
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/**
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* @addtogroup metaprogramming
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* @addtogroup metaprogramming
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* @{
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* @{
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*/
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*/
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// Primary classification traits.
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// Primary classification traits.
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/// is_lvalue_reference
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/// is_lvalue_reference
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template
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template
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struct is_lvalue_reference
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struct is_lvalue_reference
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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_lvalue_reference<_Tp&>
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struct is_lvalue_reference<_Tp&>
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: public true_type { };
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: public true_type { };
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/// is_rvalue_reference
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/// is_rvalue_reference
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template
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template
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struct is_rvalue_reference
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struct is_rvalue_reference
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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_rvalue_reference<_Tp&&>
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struct is_rvalue_reference<_Tp&&>
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: public true_type { };
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: public true_type { };
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// Secondary classification traits.
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// Secondary classification traits.
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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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: public integral_constant::value
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: public integral_constant::value
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|| is_rvalue_reference<_Tp>::value)>
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|| is_rvalue_reference<_Tp>::value)>
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{ };
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{ };
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// Reference transformations.
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// Reference transformations.
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/// remove_reference
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/// remove_reference
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template
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template
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struct remove_reference
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struct remove_reference
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{ typedef _Tp type; };
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{ typedef _Tp type; };
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template
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template
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struct remove_reference<_Tp&>
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struct remove_reference<_Tp&>
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{ typedef _Tp type; };
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{ typedef _Tp type; };
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template
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template
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struct remove_reference<_Tp&&>
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struct remove_reference<_Tp&&>
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{ typedef _Tp type; };
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{ typedef _Tp type; };
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template
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template
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bool = !is_reference<_Tp>::value && !is_void<_Tp>::value,
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bool = !is_reference<_Tp>::value && !is_void<_Tp>::value,
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bool = is_rvalue_reference<_Tp>::value>
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bool = is_rvalue_reference<_Tp>::value>
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struct __add_lvalue_reference_helper
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struct __add_lvalue_reference_helper
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{ typedef _Tp type; };
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{ typedef _Tp type; };
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template
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template
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struct __add_lvalue_reference_helper<_Tp, true, false>
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struct __add_lvalue_reference_helper<_Tp, true, false>
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{ typedef _Tp& type; };
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{ typedef _Tp& type; };
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template
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template
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struct __add_lvalue_reference_helper<_Tp, false, true>
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struct __add_lvalue_reference_helper<_Tp, false, true>
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{ typedef typename remove_reference<_Tp>::type& type; };
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{ typedef typename remove_reference<_Tp>::type& type; };
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/// add_lvalue_reference
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/// add_lvalue_reference
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template
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template
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struct add_lvalue_reference
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struct add_lvalue_reference
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: public __add_lvalue_reference_helper<_Tp>
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: public __add_lvalue_reference_helper<_Tp>
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{ };
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{ };
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template
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template
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bool = !is_reference<_Tp>::value && !is_void<_Tp>::value>
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bool = !is_reference<_Tp>::value && !is_void<_Tp>::value>
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struct __add_rvalue_reference_helper
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struct __add_rvalue_reference_helper
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{ typedef _Tp type; };
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{ typedef _Tp type; };
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template
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template
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struct __add_rvalue_reference_helper<_Tp, true>
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struct __add_rvalue_reference_helper<_Tp, true>
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{ typedef _Tp&& type; };
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{ typedef _Tp&& type; };
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/// add_rvalue_reference
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/// add_rvalue_reference
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template
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template
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struct add_rvalue_reference
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struct add_rvalue_reference
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: public __add_rvalue_reference_helper<_Tp>
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: public __add_rvalue_reference_helper<_Tp>
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{ };
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{ };
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// Scalar properties and transformations.
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// Scalar properties and transformations.
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template
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template
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bool = is_integral<_Tp>::value,
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bool = is_integral<_Tp>::value,
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bool = is_floating_point<_Tp>::value>
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bool = is_floating_point<_Tp>::value>
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struct __is_signed_helper
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struct __is_signed_helper
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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_signed_helper<_Tp, false, true>
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struct __is_signed_helper<_Tp, false, true>
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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_signed_helper<_Tp, true, false>
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struct __is_signed_helper<_Tp, true, false>
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: public integral_constant(_Tp(-1) < _Tp(0))>
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: public integral_constant(_Tp(-1) < _Tp(0))>
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{ };
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{ };
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/// is_signed
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/// is_signed
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template
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template
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struct is_signed
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struct is_signed
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: public integral_constant::value>
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: public integral_constant::value>
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{ };
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{ };
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/// is_unsigned
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/// is_unsigned
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template
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template
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struct is_unsigned
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struct is_unsigned
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: public integral_constant::value
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: public integral_constant::value
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&& !is_signed<_Tp>::value)>
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&& !is_signed<_Tp>::value)>
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{ };
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{ };
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// Member introspection.
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// Member introspection.
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/// is_trivial
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/// is_trivial
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template
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template
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struct is_trivial
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struct is_trivial
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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_standard_layout
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/// is_standard_layout
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template
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template
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struct is_standard_layout
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struct is_standard_layout
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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_pod
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/// is_pod
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// Could use is_standard_layout && is_trivial instead of the builtin.
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// Could use is_standard_layout && is_trivial instead of the builtin.
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template
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template
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struct is_pod
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struct is_pod
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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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template
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template
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typename add_rvalue_reference<_Tp>::type declval();
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typename add_rvalue_reference<_Tp>::type declval();
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template
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template
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class __is_constructible_helper
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class __is_constructible_helper
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: public __sfinae_types
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: public __sfinae_types
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{
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{
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template
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template
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static decltype(_Tp1(declval<_Args1>()...), __one()) __test(int);
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static decltype(_Tp1(declval<_Args1>()...), __one()) __test(int);
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template
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template
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static __two __test(...);
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static __two __test(...);
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public:
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public:
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static const bool __value = sizeof(__test<_Tp, _Args...>(0)) == 1;
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static const bool __value = sizeof(__test<_Tp, _Args...>(0)) == 1;
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};
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};
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template
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template
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class __is_constructible_helper<_Tp, _Arg>
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class __is_constructible_helper<_Tp, _Arg>
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: public __sfinae_types
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: public __sfinae_types
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{
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{
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template
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template
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static decltype(static_cast<_Tp1>(declval<_Arg1>()), __one())
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static decltype(static_cast<_Tp1>(declval<_Arg1>()), __one())
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__test(int);
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__test(int);
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template
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template
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static __two __test(...);
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static __two __test(...);
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public:
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public:
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static const bool __value = sizeof(__test<_Tp, _Arg>(0)) == 1;
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static const bool __value = sizeof(__test<_Tp, _Arg>(0)) == 1;
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};
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};
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/// is_constructible
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/// is_constructible
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// XXX FIXME
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// XXX FIXME
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// The C++0x specifications require front-end support, see N2255.
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// The C++0x specifications require front-end support, see N2255.
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template
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template
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struct is_constructible
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struct is_constructible
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: public integral_constant
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: public integral_constant
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__is_constructible_helper<_Tp,
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__is_constructible_helper<_Tp,
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_Args...>::__value>
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_Args...>::__value>
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{ };
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{ };
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/// has_trivial_default_constructor
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/// has_trivial_default_constructor
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template
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template
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struct has_trivial_default_constructor
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struct has_trivial_default_constructor
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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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/// has_trivial_copy_constructor
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/// has_trivial_copy_constructor
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template
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template
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struct has_trivial_copy_constructor
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struct has_trivial_copy_constructor
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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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/// has_trivial_assign
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/// has_trivial_assign
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template
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template
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struct has_trivial_assign
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struct has_trivial_assign
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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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/// has_trivial_destructor
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/// has_trivial_destructor
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template
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template
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struct has_trivial_destructor
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struct has_trivial_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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/// has_nothrow_default_constructor
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/// has_nothrow_default_constructor
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template
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template
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struct has_nothrow_default_constructor
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struct has_nothrow_default_constructor
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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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/// has_nothrow_copy_constructor
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/// has_nothrow_copy_constructor
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template
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template
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struct has_nothrow_copy_constructor
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struct has_nothrow_copy_constructor
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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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/// has_nothrow_assign
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/// has_nothrow_assign
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template
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template
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struct has_nothrow_assign
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struct has_nothrow_assign
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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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// Relationships between types.
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// Relationships between types.
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/// is_base_of
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/// is_base_of
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template
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template
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struct is_base_of
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struct is_base_of
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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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template
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template
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bool = (is_void<_From>::value || is_void<_To>::value
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bool = (is_void<_From>::value || is_void<_To>::value
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|| is_function<_To>::value || is_array<_To>::value)>
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|| is_function<_To>::value || is_array<_To>::value)>
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struct __is_convertible_helper
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struct __is_convertible_helper
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{ static const bool __value = (is_void<_From>::value
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{ static const bool __value = (is_void<_From>::value
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&& is_void<_To>::value); };
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&& is_void<_To>::value); };
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template
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template
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class __is_convertible_helper<_From, _To, false>
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class __is_convertible_helper<_From, _To, false>
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: public __sfinae_types
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: public __sfinae_types
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{
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{
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static __one __test(_To);
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static __one __test(_To);
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static __two __test(...);
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static __two __test(...);
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public:
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public:
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static const bool __value = sizeof(__test(declval<_From>())) == 1;
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static const bool __value = sizeof(__test(declval<_From>())) == 1;
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};
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};
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/// is_convertible
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/// is_convertible
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// XXX FIXME
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// XXX FIXME
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// The C++0x specifications require front-end support, see N2255.
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// The C++0x specifications require front-end support, see N2255.
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template
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template
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struct is_convertible
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struct is_convertible
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: public integral_constant
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: public integral_constant
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__is_convertible_helper<_From, _To>::__value>
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__is_convertible_helper<_From, _To>::__value>
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{ };
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{ };
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/// is_explicitly_convertible
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/// is_explicitly_convertible
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template
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template
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struct is_explicitly_convertible
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struct is_explicitly_convertible
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: public is_constructible<_To, _From>
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: public is_constructible<_To, _From>
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{ };
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{ };
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template
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template
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struct __aligned_storage_msa
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struct __aligned_storage_msa
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{
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{
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union __type
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union __type
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{
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{
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unsigned char __data[_Len];
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unsigned char __data[_Len];
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struct __attribute__((__aligned__)) { } __align;
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struct __attribute__((__aligned__)) { } __align;
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};
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};
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};
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};
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/**
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/**
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* @brief Alignment type.
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* @brief Alignment type.
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*
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*
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* The value of _Align is a default-alignment which shall be the
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* The value of _Align is a default-alignment which shall be the
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* most stringent alignment requirement for any C++ object type
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* most stringent alignment requirement for any C++ object type
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* whose size is no greater than _Len (3.9). The member typedef
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* whose size is no greater than _Len (3.9). The member typedef
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* type shall be a POD type suitable for use as uninitialized
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* type shall be a POD type suitable for use as uninitialized
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* storage for any object whose size is at most _Len and whose
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* storage for any object whose size is at most _Len and whose
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* alignment is a divisor of _Align.
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* alignment is a divisor of _Align.
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*/
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*/
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template
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template
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__alignof__(typename __aligned_storage_msa<_Len>::__type)>
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__alignof__(typename __aligned_storage_msa<_Len>::__type)>
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struct aligned_storage
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struct aligned_storage
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{
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{
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union type
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union type
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{
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{
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unsigned char __data[_Len];
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unsigned char __data[_Len];
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struct __attribute__((__aligned__((_Align)))) { } __align;
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struct __attribute__((__aligned__((_Align)))) { } __align;
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};
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};
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};
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};
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// Define a nested type if some predicate holds.
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// Define a nested type if some predicate holds.
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// Primary template.
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// Primary template.
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/// enable_if
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/// enable_if
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template
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template
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struct enable_if
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struct enable_if
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{ };
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{ };
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// Partial specialization for true.
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// Partial specialization for true.
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template
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template
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struct enable_if
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struct enable_if
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{ typedef _Tp type; };
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{ typedef _Tp type; };
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// A conditional expression, but for types. If true, first, if false, second.
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// A conditional expression, but for types. If true, first, if false, second.
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// Primary template.
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// Primary template.
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/// conditional
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/// conditional
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template
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template
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struct conditional
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struct conditional
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{ typedef _Iftrue type; };
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{ typedef _Iftrue type; };
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|
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// Partial specialization for false.
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// Partial specialization for false.
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template
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template
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struct conditional
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struct conditional
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{ typedef _Iffalse type; };
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{ typedef _Iffalse type; };
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// Decay trait for arrays and functions, used for perfect forwarding
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// Decay trait for arrays and functions, used for perfect forwarding
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// in make_pair, make_tuple, etc.
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// in make_pair, make_tuple, etc.
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template
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template
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bool _IsArray = is_array<_Up>::value,
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bool _IsArray = is_array<_Up>::value,
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bool _IsFunction = is_function<_Up>::value>
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bool _IsFunction = is_function<_Up>::value>
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struct __decay_selector;
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struct __decay_selector;
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|
|
// NB: DR 705.
|
// NB: DR 705.
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template
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template
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struct __decay_selector<_Up, false, false>
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struct __decay_selector<_Up, false, false>
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{ typedef typename remove_cv<_Up>::type __type; };
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{ typedef typename remove_cv<_Up>::type __type; };
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|
|
template
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template
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struct __decay_selector<_Up, true, false>
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struct __decay_selector<_Up, true, false>
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{ typedef typename remove_extent<_Up>::type* __type; };
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{ typedef typename remove_extent<_Up>::type* __type; };
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|
|
template
|
template
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struct __decay_selector<_Up, false, true>
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struct __decay_selector<_Up, false, true>
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{ typedef typename add_pointer<_Up>::type __type; };
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{ typedef typename add_pointer<_Up>::type __type; };
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|
|
/// decay
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/// decay
|
template
|
template
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class decay
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class decay
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{
|
{
|
typedef typename remove_reference<_Tp>::type __remove_type;
|
typedef typename remove_reference<_Tp>::type __remove_type;
|
|
|
public:
|
public:
|
typedef typename __decay_selector<__remove_type>::__type type;
|
typedef typename __decay_selector<__remove_type>::__type type;
|
};
|
};
|
|
|
|
|
// Utility for constructing identically cv-qualified types.
|
// Utility for constructing identically cv-qualified types.
|
template
|
template
|
struct __cv_selector;
|
struct __cv_selector;
|
|
|
template
|
template
|
struct __cv_selector<_Unqualified, false, false>
|
struct __cv_selector<_Unqualified, false, false>
|
{ typedef _Unqualified __type; };
|
{ typedef _Unqualified __type; };
|
|
|
template
|
template
|
struct __cv_selector<_Unqualified, false, true>
|
struct __cv_selector<_Unqualified, false, true>
|
{ typedef volatile _Unqualified __type; };
|
{ typedef volatile _Unqualified __type; };
|
|
|
template
|
template
|
struct __cv_selector<_Unqualified, true, false>
|
struct __cv_selector<_Unqualified, true, false>
|
{ typedef const _Unqualified __type; };
|
{ typedef const _Unqualified __type; };
|
|
|
template
|
template
|
struct __cv_selector<_Unqualified, true, true>
|
struct __cv_selector<_Unqualified, true, true>
|
{ typedef const volatile _Unqualified __type; };
|
{ typedef const volatile _Unqualified __type; };
|
|
|
template
|
template
|
bool _IsConst = is_const<_Qualified>::value,
|
bool _IsConst = is_const<_Qualified>::value,
|
bool _IsVol = is_volatile<_Qualified>::value>
|
bool _IsVol = is_volatile<_Qualified>::value>
|
class __match_cv_qualifiers
|
class __match_cv_qualifiers
|
{
|
{
|
typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
|
typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
|
|
|
public:
|
public:
|
typedef typename __match::__type __type;
|
typedef typename __match::__type __type;
|
};
|
};
|
|
|
|
|
// Utility for finding the unsigned versions of signed integral types.
|
// Utility for finding the unsigned versions of signed integral types.
|
template
|
template
|
struct __make_unsigned
|
struct __make_unsigned
|
{ typedef _Tp __type; };
|
{ typedef _Tp __type; };
|
|
|
template<>
|
template<>
|
struct __make_unsigned
|
struct __make_unsigned
|
{ typedef unsigned char __type; };
|
{ typedef unsigned char __type; };
|
|
|
template<>
|
template<>
|
struct __make_unsigned
|
struct __make_unsigned
|
{ typedef unsigned char __type; };
|
{ typedef unsigned char __type; };
|
|
|
template<>
|
template<>
|
struct __make_unsigned
|
struct __make_unsigned
|
{ typedef unsigned short __type; };
|
{ typedef unsigned short __type; };
|
|
|
template<>
|
template<>
|
struct __make_unsigned
|
struct __make_unsigned
|
{ typedef unsigned int __type; };
|
{ typedef unsigned int __type; };
|
|
|
template<>
|
template<>
|
struct __make_unsigned
|
struct __make_unsigned
|
{ typedef unsigned long __type; };
|
{ typedef unsigned long __type; };
|
|
|
template<>
|
template<>
|
struct __make_unsigned
|
struct __make_unsigned
|
{ typedef unsigned long long __type; };
|
{ typedef unsigned long long __type; };
|
|
|
|
|
// Select between integral and enum: not possible to be both.
|
// Select between integral and enum: not possible to be both.
|
template
|
template
|
bool _IsInt = is_integral<_Tp>::value,
|
bool _IsInt = is_integral<_Tp>::value,
|
bool _IsEnum = is_enum<_Tp>::value>
|
bool _IsEnum = is_enum<_Tp>::value>
|
class __make_unsigned_selector;
|
class __make_unsigned_selector;
|
|
|
template
|
template
|
class __make_unsigned_selector<_Tp, true, false>
|
class __make_unsigned_selector<_Tp, true, false>
|
{
|
{
|
typedef __make_unsigned::type> __unsignedt;
|
typedef __make_unsigned::type> __unsignedt;
|
typedef typename __unsignedt::__type __unsigned_type;
|
typedef typename __unsignedt::__type __unsigned_type;
|
typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
|
typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
|
|
|
public:
|
public:
|
typedef typename __cv_unsigned::__type __type;
|
typedef typename __cv_unsigned::__type __type;
|
};
|
};
|
|
|
template
|
template
|
class __make_unsigned_selector<_Tp, false, true>
|
class __make_unsigned_selector<_Tp, false, true>
|
{
|
{
|
// With -fshort-enums, an enum may be as small as a char.
|
// With -fshort-enums, an enum may be as small as a char.
|
typedef unsigned char __smallest;
|
typedef unsigned char __smallest;
|
static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
|
static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
|
static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short);
|
static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short);
|
static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int);
|
static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int);
|
typedef conditional<__b2, unsigned int, unsigned long> __cond2;
|
typedef conditional<__b2, unsigned int, unsigned long> __cond2;
|
typedef typename __cond2::type __cond2_type;
|
typedef typename __cond2::type __cond2_type;
|
typedef conditional<__b1, unsigned short, __cond2_type> __cond1;
|
typedef conditional<__b1, unsigned short, __cond2_type> __cond1;
|
typedef typename __cond1::type __cond1_type;
|
typedef typename __cond1::type __cond1_type;
|
|
|
public:
|
public:
|
typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
|
typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
|
};
|
};
|
|
|
// Given an integral/enum type, return the corresponding unsigned
|
// Given an integral/enum type, return the corresponding unsigned
|
// integer type.
|
// integer type.
|
// Primary template.
|
// Primary template.
|
/// make_unsigned
|
/// make_unsigned
|
template
|
template
|
struct make_unsigned
|
struct make_unsigned
|
{ typedef typename __make_unsigned_selector<_Tp>::__type type; };
|
{ typedef typename __make_unsigned_selector<_Tp>::__type type; };
|
|
|
// Integral, but don't define.
|
// Integral, but don't define.
|
template<>
|
template<>
|
struct make_unsigned;
|
struct make_unsigned;
|
|
|
|
|
// Utility for finding the signed versions of unsigned integral types.
|
// Utility for finding the signed versions of unsigned integral types.
|
template
|
template
|
struct __make_signed
|
struct __make_signed
|
{ typedef _Tp __type; };
|
{ typedef _Tp __type; };
|
|
|
template<>
|
template<>
|
struct __make_signed
|
struct __make_signed
|
{ typedef signed char __type; };
|
{ typedef signed char __type; };
|
|
|
template<>
|
template<>
|
struct __make_signed
|
struct __make_signed
|
{ typedef signed char __type; };
|
{ typedef signed char __type; };
|
|
|
template<>
|
template<>
|
struct __make_signed
|
struct __make_signed
|
{ typedef signed short __type; };
|
{ typedef signed short __type; };
|
|
|
template<>
|
template<>
|
struct __make_signed
|
struct __make_signed
|
{ typedef signed int __type; };
|
{ typedef signed int __type; };
|
|
|
template<>
|
template<>
|
struct __make_signed
|
struct __make_signed
|
{ typedef signed long __type; };
|
{ typedef signed long __type; };
|
|
|
template<>
|
template<>
|
struct __make_signed
|
struct __make_signed
|
{ typedef signed long long __type; };
|
{ typedef signed long long __type; };
|
|
|
|
|
// Select between integral and enum: not possible to be both.
|
// Select between integral and enum: not possible to be both.
|
template
|
template
|
bool _IsInt = is_integral<_Tp>::value,
|
bool _IsInt = is_integral<_Tp>::value,
|
bool _IsEnum = is_enum<_Tp>::value>
|
bool _IsEnum = is_enum<_Tp>::value>
|
class __make_signed_selector;
|
class __make_signed_selector;
|
|
|
template
|
template
|
class __make_signed_selector<_Tp, true, false>
|
class __make_signed_selector<_Tp, true, false>
|
{
|
{
|
typedef __make_signed::type> __signedt;
|
typedef __make_signed::type> __signedt;
|
typedef typename __signedt::__type __signed_type;
|
typedef typename __signedt::__type __signed_type;
|
typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed;
|
typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed;
|
|
|
public:
|
public:
|
typedef typename __cv_signed::__type __type;
|
typedef typename __cv_signed::__type __type;
|
};
|
};
|
|
|
template
|
template
|
class __make_signed_selector<_Tp, false, true>
|
class __make_signed_selector<_Tp, false, true>
|
{
|
{
|
// With -fshort-enums, an enum may be as small as a char.
|
// With -fshort-enums, an enum may be as small as a char.
|
typedef signed char __smallest;
|
typedef signed char __smallest;
|
static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
|
static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
|
static const bool __b1 = sizeof(_Tp) <= sizeof(signed short);
|
static const bool __b1 = sizeof(_Tp) <= sizeof(signed short);
|
static const bool __b2 = sizeof(_Tp) <= sizeof(signed int);
|
static const bool __b2 = sizeof(_Tp) <= sizeof(signed int);
|
typedef conditional<__b2, signed int, signed long> __cond2;
|
typedef conditional<__b2, signed int, signed long> __cond2;
|
typedef typename __cond2::type __cond2_type;
|
typedef typename __cond2::type __cond2_type;
|
typedef conditional<__b1, signed short, __cond2_type> __cond1;
|
typedef conditional<__b1, signed short, __cond2_type> __cond1;
|
typedef typename __cond1::type __cond1_type;
|
typedef typename __cond1::type __cond1_type;
|
|
|
public:
|
public:
|
typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
|
typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
|
};
|
};
|
|
|
// Given an integral/enum type, return the corresponding signed
|
// Given an integral/enum type, return the corresponding signed
|
// integer type.
|
// integer type.
|
// Primary template.
|
// Primary template.
|
/// make_signed
|
/// make_signed
|
template
|
template
|
struct make_signed
|
struct make_signed
|
{ typedef typename __make_signed_selector<_Tp>::__type type; };
|
{ typedef typename __make_signed_selector<_Tp>::__type type; };
|
|
|
// Integral, but don't define.
|
// Integral, but don't define.
|
template<>
|
template<>
|
struct make_signed;
|
struct make_signed;
|
|
|
/// common_type
|
/// common_type
|
template
|
template
|
struct common_type;
|
struct common_type;
|
|
|
template
|
template
|
struct common_type<_Tp>
|
struct common_type<_Tp>
|
{ typedef _Tp type; };
|
{ typedef _Tp type; };
|
|
|
template
|
template
|
struct common_type<_Tp, _Up>
|
struct common_type<_Tp, _Up>
|
{ typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; };
|
{ typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; };
|
|
|
template
|
template
|
struct common_type<_Tp, _Up, _Vp...>
|
struct common_type<_Tp, _Up, _Vp...>
|
{
|
{
|
typedef typename
|
typedef typename
|
common_type::type, _Vp...>::type type;
|
common_type::type, _Vp...>::type type;
|
};
|
};
|
// @} group metaprogramming
|
// @} group metaprogramming
|
|
|
/// declval
|
/// declval
|
template
|
template
|
struct __declval_protector
|
struct __declval_protector
|
{
|
{
|
static const bool __stop = false;
|
static const bool __stop = false;
|
static typename add_rvalue_reference<_Tp>::type __delegate();
|
static typename add_rvalue_reference<_Tp>::type __delegate();
|
};
|
};
|
|
|
template
|
template
|
inline typename add_rvalue_reference<_Tp>::type
|
inline typename add_rvalue_reference<_Tp>::type
|
declval()
|
declval()
|
{
|
{
|
static_assert(__declval_protector<_Tp>::__stop,
|
static_assert(__declval_protector<_Tp>::__stop,
|
"declval() must not be used!");
|
"declval() must not be used!");
|
return __declval_protector<_Tp>::__delegate();
|
return __declval_protector<_Tp>::__delegate();
|
}
|
}
|
}
|
}
|
|
|
#endif // __GXX_EXPERIMENTAL_CXX0X__
|
#endif // __GXX_EXPERIMENTAL_CXX0X__
|
|
|
#endif // _GLIBCXX_TYPE_TRAITS
|
#endif // _GLIBCXX_TYPE_TRAITS
|
|
|
