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