1169691Skan// Internal header for TR1 complex -*- C++ -*-
2169691Skan
3169691Skan// Copyright (C) 2006 Free Software Foundation, Inc.
4169691Skan//
5169691Skan// This file is part of the GNU ISO C++ Library.  This library is free
6169691Skan// software; you can redistribute it and/or modify it under the
7169691Skan// terms of the GNU General Public License as published by the
8169691Skan// Free Software Foundation; either version 2, or (at your option)
9169691Skan// any later version.
10169691Skan
11169691Skan// This library is distributed in the hope that it will be useful,
12169691Skan// but WITHOUT ANY WARRANTY; without even the implied warranty of
13169691Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14169691Skan// GNU General Public License for more details.
15169691Skan
16169691Skan// You should have received a copy of the GNU General Public License along
17169691Skan// with this library; see the file COPYING.  If not, write to the Free
18169691Skan// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19169691Skan// USA.
20169691Skan
21169691Skan// As a special exception, you may use this file as part of a free software
22169691Skan// library without restriction.  Specifically, if other files instantiate
23169691Skan// templates or use macros or inline functions from this file, or you compile
24169691Skan// this file and link it with other files to produce an executable, this
25169691Skan// file does not by itself cause the resulting executable to be covered by
26169691Skan// the GNU General Public License.  This exception does not however
27169691Skan// invalidate any other reasons why the executable file might be covered by
28169691Skan// the GNU General Public License.
29169691Skan
30169691Skan/** @file tr1/common.h
31169691Skan *  This is a TR1 C++ Library header.
32169691Skan */
33169691Skan
34169691Skan#ifndef _TR1_COMMON_H
35169691Skan#define _TR1_COMMON_H 1
36169691Skan
37169691Skan#include <tr1/type_traits>
38169691Skan
39169691Skan// namespace std::tr1
40169691Skannamespace std
41169691Skan{
42169691Skan_GLIBCXX_BEGIN_NAMESPACE(tr1)
43169691Skan
44169691Skan  template<typename _Tp, bool = is_integral<_Tp>::value>
45169691Skan    struct __promote
46169691Skan    { typedef double __type; };
47169691Skan
48169691Skan  template<typename _Tp>
49169691Skan    struct __promote<_Tp, false>
50169691Skan    { typedef _Tp __type; };
51169691Skan
52169691Skan  template<typename _Tp, typename _Up>
53169691Skan    struct __promote_2
54169691Skan    {
55169691Skan    private:
56169691Skan      typedef typename __promote<_Tp>::__type __type1;
57169691Skan      typedef typename __promote<_Up>::__type __type2;
58169691Skan
59169691Skan    public:
60169691Skan      typedef __typeof__(__type1() + __type2()) __type;
61169691Skan    };
62169691Skan
63169691Skan  template<typename _Tp, typename _Up, typename _Vp>
64169691Skan    struct __promote_3
65169691Skan    {
66169691Skan    private:
67169691Skan      typedef typename __promote<_Tp>::__type __type1;
68169691Skan      typedef typename __promote<_Up>::__type __type2;
69169691Skan      typedef typename __promote<_Vp>::__type __type3;
70169691Skan
71169691Skan    public:
72169691Skan      typedef __typeof__(__type1() + __type2() + __type3()) __type;
73169691Skan    };
74169691Skan
75169691Skan_GLIBCXX_END_NAMESPACE
76169691Skan} // namespace std
77169691Skan
78169691Skan#endif
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