1// -*- C++ -*-
2
3// Copyright (C) 2005-2013 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 terms
7// of the GNU General Public License as published by the Free Software
8// Foundation; either version 3, or (at your option) any later
9// version.
10
11// This library is distributed in the hope that it will be useful, but
12// WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14// General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23// <http://www.gnu.org/licenses/>.
24
25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
26
27// Permission to use, copy, modify, sell, and distribute this software
28// is hereby granted without fee, provided that the above copyright
29// notice appears in all copies, and that both that copyright notice
30// and this permission notice appear in supporting documentation. None
31// of the above authors, nor IBM Haifa Research Laboratories, make any
32// representation about the suitability of this software for any
33// purpose. It is provided "as is" without express or implied
34// warranty.
35
36/**
37 * @file detail/type_utils.hpp
38 * Contains utilities for handnling types. All of these classes are based on
39 * Modern C++ by Andrei Alxandrescu.
40 */
41
42#ifndef PB_DS_TYPE_UTILS_HPP
43#define PB_DS_TYPE_UTILS_HPP
44
45#include <cstddef>
46#include <utility>
47#include <tr1/type_traits>
48#include <ext/type_traits.h>
49#include <ext/numeric_traits.h>
50
51namespace __gnu_pbds
52{
53  namespace detail
54  {
55    using std::tr1::is_same;
56    using std::tr1::is_const;
57    using std::tr1::is_pointer;
58    using std::tr1::is_reference;
59    using std::tr1::is_fundamental;
60    using std::tr1::is_member_object_pointer;
61    using std::tr1::is_member_pointer;
62    using std::tr1::is_base_of;
63    using std::tr1::remove_const;
64    using std::tr1::remove_reference;
65
66    // Need integral_const<bool, true> <-> integral_const<int, 1>, so
67    // because of this use the following typedefs instead of importing
68    // std::tr1's.
69    using std::tr1::integral_constant;
70    typedef std::tr1::integral_constant<int, 1> true_type;
71    typedef std::tr1::integral_constant<int, 0> false_type;
72
73    using __gnu_cxx::__conditional_type;
74    using __gnu_cxx::__numeric_traits;
75
76    template<typename T>
77    struct is_const_pointer
78    {
79      enum
80	{
81	  value = is_const<T>::value && is_pointer<T>::value
82	};
83    };
84
85    template<typename T>
86    struct is_const_reference
87    {
88      enum
89	{
90	  value = is_const<T>::value && is_reference<T>::value
91	};
92    };
93
94    template<typename T>
95    struct is_simple
96    {
97      enum
98	{
99	  value = is_fundamental<typename remove_const<T>::type>::value
100	  || is_pointer<typename remove_const<T>::type>::value
101	  || is_member_pointer<T>::value
102	};
103    };
104
105    template<typename T>
106    class is_pair
107    {
108    private:
109      template<typename U>
110      struct is_pair_imp
111      {
112	enum
113	  {
114	    value = 0
115	  };
116      };
117
118      template<typename U, typename V>
119      struct is_pair_imp<std::pair<U,V> >
120      {
121	enum
122	  {
123	    value = 1
124	  };
125      };
126
127    public:
128      enum
129	{
130	  value = is_pair_imp<T>::value
131	};
132    };
133
134    // Use C++0x's static_assert if possible.
135#if __cplusplus >= 201103L
136#define PB_DS_STATIC_ASSERT(UNIQUE, E)  static_assert(E, #UNIQUE)
137#else
138    template<bool>
139    struct __static_assert;
140
141    template<>
142    struct __static_assert<true>
143    { };
144
145    template<int>
146    struct __static_assert_dumclass
147    {
148      enum
149	{
150	  v = 1
151	};
152    };
153
154#define PB_DS_STATIC_ASSERT(UNIQUE, E)  \
155    typedef __gnu_pbds::detail::__static_assert_dumclass<sizeof(__gnu_pbds::detail::__static_assert<bool(E)>)> UNIQUE##__static_assert_type
156
157#endif
158
159    template<typename Type>
160    struct type_to_type
161    {
162      typedef Type type;
163    };
164  } // namespace detail
165} // namespace __gnu_pbds
166
167#endif
168