forked from KolibriOS/kolibrios
219 lines
5.7 KiB
C
219 lines
5.7 KiB
C
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// -*- C++ -*-
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// Copyright (C) 2005-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file ext/type_traits.h
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* This file is a GNU extension to the Standard C++ Library.
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*/
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#ifndef _EXT_TYPE_TRAITS
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#define _EXT_TYPE_TRAITS 1
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#pragma GCC system_header
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#include <bits/c++config.h>
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#include <bits/cpp_type_traits.h>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Define a nested type if some predicate holds.
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template<bool, typename>
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struct __enable_if
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{ };
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template<typename _Tp>
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struct __enable_if<true, _Tp>
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{ typedef _Tp __type; };
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// Conditional expression for types. If true, first, if false, second.
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template<bool _Cond, typename _Iftrue, typename _Iffalse>
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struct __conditional_type
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{ typedef _Iftrue __type; };
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template<typename _Iftrue, typename _Iffalse>
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struct __conditional_type<false, _Iftrue, _Iffalse>
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{ typedef _Iffalse __type; };
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// Given an integral builtin type, return the corresponding unsigned type.
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template<typename _Tp>
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struct __add_unsigned
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{
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private:
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typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
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public:
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typedef typename __if_type::__type __type;
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};
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template<>
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struct __add_unsigned<char>
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{ typedef unsigned char __type; };
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template<>
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struct __add_unsigned<signed char>
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{ typedef unsigned char __type; };
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template<>
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struct __add_unsigned<short>
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{ typedef unsigned short __type; };
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template<>
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struct __add_unsigned<int>
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{ typedef unsigned int __type; };
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template<>
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struct __add_unsigned<long>
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{ typedef unsigned long __type; };
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template<>
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struct __add_unsigned<long long>
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{ typedef unsigned long long __type; };
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// Declare but don't define.
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template<>
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struct __add_unsigned<bool>;
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template<>
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struct __add_unsigned<wchar_t>;
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// Given an integral builtin type, return the corresponding signed type.
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template<typename _Tp>
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struct __remove_unsigned
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{
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private:
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typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
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public:
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typedef typename __if_type::__type __type;
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};
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template<>
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struct __remove_unsigned<char>
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{ typedef signed char __type; };
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template<>
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struct __remove_unsigned<unsigned char>
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{ typedef signed char __type; };
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template<>
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struct __remove_unsigned<unsigned short>
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{ typedef short __type; };
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template<>
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struct __remove_unsigned<unsigned int>
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{ typedef int __type; };
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template<>
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struct __remove_unsigned<unsigned long>
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{ typedef long __type; };
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template<>
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struct __remove_unsigned<unsigned long long>
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{ typedef long long __type; };
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// Declare but don't define.
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template<>
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struct __remove_unsigned<bool>;
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template<>
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struct __remove_unsigned<wchar_t>;
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// For use in string and vstring.
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template<typename _Type>
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inline bool
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__is_null_pointer(_Type* __ptr)
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{ return __ptr == 0; }
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template<typename _Type>
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inline bool
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__is_null_pointer(_Type)
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{ return false; }
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#if __cplusplus >= 201103L
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inline bool
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__is_null_pointer(std::nullptr_t)
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{ return true; }
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#endif
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// For complex and cmath
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template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
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struct __promote
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{ typedef double __type; };
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// No nested __type member for non-integer non-floating point types,
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// allows this type to be used for SFINAE to constrain overloads in
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// <cmath> and <complex> to only the intended types.
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template<typename _Tp>
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struct __promote<_Tp, false>
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{ };
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template<>
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struct __promote<long double>
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{ typedef long double __type; };
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template<>
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struct __promote<double>
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{ typedef double __type; };
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template<>
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struct __promote<float>
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{ typedef float __type; };
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template<typename _Tp, typename _Up,
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typename _Tp2 = typename __promote<_Tp>::__type,
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typename _Up2 = typename __promote<_Up>::__type>
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struct __promote_2
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{
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typedef __typeof__(_Tp2() + _Up2()) __type;
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};
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template<typename _Tp, typename _Up, typename _Vp,
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typename _Tp2 = typename __promote<_Tp>::__type,
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typename _Up2 = typename __promote<_Up>::__type,
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typename _Vp2 = typename __promote<_Vp>::__type>
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struct __promote_3
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{
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typedef __typeof__(_Tp2() + _Up2() + _Vp2()) __type;
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};
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template<typename _Tp, typename _Up, typename _Vp, typename _Wp,
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typename _Tp2 = typename __promote<_Tp>::__type,
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typename _Up2 = typename __promote<_Up>::__type,
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typename _Vp2 = typename __promote<_Vp>::__type,
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typename _Wp2 = typename __promote<_Wp>::__type>
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struct __promote_4
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{
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typedef __typeof__(_Tp2() + _Up2() + _Vp2() + _Wp2()) __type;
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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