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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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// . |
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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 |
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#include |
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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 |
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struct __enable_if |
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{ }; |
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template |
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struct __enable_if |
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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 |
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struct __conditional_type |
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{ typedef _Iftrue __type; }; |
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template |
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struct __conditional_type |
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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 |
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struct __add_unsigned |
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{ |
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private: |
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typedef __enable_if::__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 |
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{ typedef unsigned char __type; }; |
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template<> |
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struct __add_unsigned |
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{ typedef unsigned char __type; }; |
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template<> |
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struct __add_unsigned |
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{ typedef unsigned short __type; }; |
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template<> |
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struct __add_unsigned |
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{ typedef unsigned int __type; }; |
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template<> |
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struct __add_unsigned |
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{ typedef unsigned long __type; }; |
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template<> |
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struct __add_unsigned |
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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; |
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template<> |
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struct __add_unsigned; |
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// Given an integral builtin type, return the corresponding signed type. |
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template |
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struct __remove_unsigned |
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{ |
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private: |
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typedef __enable_if::__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 |
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{ typedef signed char __type; }; |
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template<> |
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struct __remove_unsigned |
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{ typedef signed char __type; }; |
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template<> |
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struct __remove_unsigned |
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{ typedef short __type; }; |
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template<> |
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struct __remove_unsigned |
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{ typedef int __type; }; |
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template<> |
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struct __remove_unsigned |
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{ typedef long __type; }; |
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template<> |
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struct __remove_unsigned |
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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; |
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template<> |
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struct __remove_unsigned; |
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// For use in string and vstring. |
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template |
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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 |
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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::__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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// and to only the intended types. |
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template |
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struct __promote<_Tp, false> |
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{ }; |
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template<> |
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struct __promote |
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{ typedef long double __type; }; |
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template<> |
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struct __promote |
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{ typedef double __type; }; |
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template<> |
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struct __promote |
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{ typedef float __type; }; |
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template
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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
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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
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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 |