79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
// Internal header for TR1 complex -*- C++ -*-
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// Copyright (C) 2006 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file tr1/common.h
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* This is a TR1 C++ Library header.
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*/
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#ifndef _TR1_COMMON_H
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#define _TR1_COMMON_H 1
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#include <tr1/type_traits>
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// namespace std::tr1
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namespace std
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{
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_GLIBCXX_BEGIN_NAMESPACE(tr1)
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template<typename _Tp, bool = is_integral<_Tp>::value>
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struct __promote
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{ typedef double __type; };
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template<typename _Tp>
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struct __promote<_Tp, false>
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{ typedef _Tp __type; };
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template<typename _Tp, typename _Up>
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struct __promote_2
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{
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private:
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typedef typename __promote<_Tp>::__type __type1;
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typedef typename __promote<_Up>::__type __type2;
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public:
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typedef __typeof__(__type1() + __type2()) __type;
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};
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template<typename _Tp, typename _Up, typename _Vp>
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struct __promote_3
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{
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private:
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typedef typename __promote<_Tp>::__type __type1;
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typedef typename __promote<_Up>::__type __type2;
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typedef typename __promote<_Vp>::__type __type3;
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public:
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typedef __typeof__(__type1() + __type2() + __type3()) __type;
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};
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_GLIBCXX_END_NAMESPACE
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} // namespace std
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#endif
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