1// -*- C++ -*-
2
3// Copyright (C) 2005 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 2, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15
16// You should have received a copy of the GNU General Public License along
17// with this library; see the file COPYING.  If not, write to the Free
18// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19// USA.
20
21// As a special exception, you may use this file as part of a free software
22// library without restriction.  Specifically, if other files instantiate
23// templates or use macros or inline functions from this file, or you compile
24// this file and link it with other files to produce an executable, this
25// file does not by itself cause the resulting executable to be covered by
26// the GNU General Public License.  This exception does not however
27// invalidate any other reasons why the executable file might be covered by
28// the GNU General Public License.
29
30// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
31
32// Permission to use, copy, modify, sell, and distribute this software
33// is hereby granted without fee, provided that the above copyright
34// notice appears in all copies, and that both that copyright notice and
35// this permission notice appear in supporting documentation. None of
36// the above authors, nor IBM Haifa Research Laboratories, make any
37// representation about the suitability of this software for any
38// purpose. It is provided "as is" without express or implied warranty.
39
40/**
41 * @file typelist_contains.hpp
42 * Contains typelist utilities.
43 * Typelists are an idea by Andrei Alexandrescu.
44 */
45
46#ifndef TYPELIST_CONTAINS_HPP
47#define TYPELIST_CONTAINS_HPP
48
49#ifdef _MSC_VER
50#pragma warning(disable: 4503)
51#endif // #ifdef _MSC_VER
52
53#include <ext/pb_assoc/detail/type_utils.hpp>
54
55namespace detail
56{
57
58  template<class Typelist_Chain, class T>
59  struct typelist_contains_;
60
61  template<class T>
62  struct typelist_contains_<
63    null_type,
64    T>
65  {
66    enum
67      {
68	value = false
69      };
70  };
71
72  template<class Hd, class Tl, class T>
73  struct typelist_contains_<
74    typelist_chain<Hd, Tl>,
75    T>
76  {
77    enum
78      {
79	value =
80	typelist_contains_<
81	Tl, T>::value
82      };
83  };
84
85  template<class Tl, class T>
86  struct typelist_contains_<
87    typelist_chain<T, Tl>,
88    T>
89  {
90    enum
91      {
92	value = true
93      };
94  };
95
96} // namespace detail
97
98#endif // #ifndef TYPELIST_CONTAINS_HPP
99
100