common.h

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00001 // Internal header for TR1 complex -*- C++ -*-
00002 
00003 // Copyright (C) 2006 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /** @file tr1/common.h
00031  *  This is a TR1 C++ Library header. 
00032  */
00033 
00034 #ifndef _TR1_COMMON_H
00035 #define _TR1_COMMON_H 1
00036 
00037 #include <tr1/type_traits>
00038 
00039 // namespace std::tr1
00040 namespace std
00041 {
00042 _GLIBCXX_BEGIN_NAMESPACE(tr1)
00043 
00044   template<typename _Tp, bool = is_integral<_Tp>::value>
00045     struct __promote
00046     { typedef double __type; };
00047 
00048   template<typename _Tp>
00049     struct __promote<_Tp, false>
00050     { typedef _Tp __type; };
00051 
00052   template<typename _Tp, typename _Up>
00053     struct __promote_2
00054     {
00055     private:
00056       typedef typename __promote<_Tp>::__type __type1;
00057       typedef typename __promote<_Up>::__type __type2;
00058 
00059     public:
00060       typedef __typeof__(__type1() + __type2()) __type;
00061     };
00062 
00063   template<typename _Tp, typename _Up, typename _Vp>
00064     struct __promote_3
00065     {
00066     private:
00067       typedef typename __promote<_Tp>::__type __type1;
00068       typedef typename __promote<_Up>::__type __type2;
00069       typedef typename __promote<_Vp>::__type __type3;
00070 
00071     public:
00072       typedef __typeof__(__type1() + __type2() + __type3()) __type;
00073     };
00074 
00075 _GLIBCXX_END_NAMESPACE
00076 } // namespace std
00077 
00078 #endif

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