1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
// Copyright (c) 2014
// INRIA Saclay-Ile de France (France)
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
// Author(s) : Marc Glisse
#ifndef CGAL_TYPESET_H
#define CGAL_TYPESET_H
#include <CGAL/config.h>
#ifdef CGAL_CXX11
#include <type_traits>
#else
#include <boost/type_traits.hpp>
#endif
// Sometimes using tuple just to list types is overkill (takes forever to
// instantiate).
namespace CGAL {
#ifdef CGAL_CXX11
template<class...> struct typeset;
template<class H,class...U> struct typeset<H,U...> {
typedef H head;
typedef typeset<U...> tail;
typedef typeset type;
template<class X> using contains = typename
std::conditional<
std::is_same<H,X>::value,
std::true_type,
typename tail::template contains<X>
>::type;
template<class X> using add = typename
std::conditional<
contains<X>::value,
typeset<H,U...>,
typeset<H,U...,X>
>::type;
};
template<> struct typeset<> {
typedef typeset type;
template<class X> using contains = std::false_type;
template<class X> using add = typeset<X>;
};
#else
template<class,class> struct typeset;
template<class H=void, class T=typename
boost::mpl::if_<boost::is_same<H,void>, void, typeset<void, void> >::type >
struct typeset {
typedef typeset type;
typedef H head;
typedef T tail;
template<class X> struct contains :
boost::mpl::if_<boost::is_same<H,X>,boost::true_type,typename tail::template contains<X> >::type
{};
template<class X,class=void> struct add;
//boost::mpl::if_<boost::is_same<H,X>,typeset,typeset<X,typeset> >::type
};
template<> struct typeset<> {
typedef typeset type;
template<class X> struct contains : boost::false_type {};
template<class X> struct add : CGAL::typeset<X> {};
};
template<class H,class T>
template<class X,class>
struct typeset<H,T>::add : typeset<H,typename T::template add<X>::type> {};
template<class H,class T>
template<class V>
struct typeset<H,T>::add<H,V> : typeset<H,T> {};
#endif
template<class T1, class T2> struct typeset_union_ :
typeset_union_<typename T1::template add<typename T2::head>::type, typename T2::tail>
{};
template<class T> struct typeset_union_ <T, typeset<> > : T {};
template<class T1, class T2>
struct typeset_intersection_ {
typedef typename T1::head H;
typedef typename typeset_intersection_<typename T1::tail,T2>::type U;
typedef typename
#ifdef CGAL_CXX11
std::conditional<T2::template contains<H>::value,
#else
boost::mpl::if_<typename T2::template contains<H>,
#endif
typename U::template add<H>::type, U>::type type;
};
template<class T>
struct typeset_intersection_<typeset<>,T> : typeset<> {};
#ifdef CGAL_CXX11
template<class T1, class T2>
using typeset_union = typename typeset_union_<T1,T2>::type;
template<class T1, class T2>
using typeset_intersection = typename typeset_intersection_<T1,T2>::type;
#else
template<class T1, class T2>
struct typeset_union : typeset_union_<T1,T2>::type {};
template<class T1, class T2>
struct typeset_intersection : typeset_intersection_<T1,T2>::type {};
#endif
}
#endif
|
