# 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