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Sacado_mpl_placeholders.hpp
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1// $Id$
2// $Source$
3// @HEADER
4// ***********************************************************************
5//
6// Sacado Package
7// Copyright (2006) Sandia Corporation
8//
9// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
10// the U.S. Government retains certain rights in this software.
11//
12// This library is free software; you can redistribute it and/or modify
13// it under the terms of the GNU Lesser General Public License as
14// published by the Free Software Foundation; either version 2.1 of the
15// License, or (at your option) any later version.
16//
17// This library is distributed in the hope that it will be useful, but
18// WITHOUT ANY WARRANTY; without even the implied warranty of
19// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20// Lesser General Public License for more details.
21//
22// You should have received a copy of the GNU Lesser General Public
23// License along with this library; if not, write to the Free Software
24// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
25// USA
26// Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
27// (etphipp@sandia.gov).
28//
29// ***********************************************************************
30// @HEADER
31
32#ifndef SACADO_MPL_PLACEHOLDERS_HPP
33#define SACADO_MPL_PLACEHOLDERS_HPP
34
35#include "Sacado_mpl_none.hpp"
36
37namespace Sacado {
38
39 namespace mpl {
40
41 // Placeholder definitions
42 template <int N> struct arg {};
43
44 template <> struct arg<1> {
45 template <class A1,
46 class A2=mpl::none,
47 class A3=mpl::none,
48 class A4=mpl::none,
49 class A5=mpl::none>
50 struct apply {
51 typedef A1 type;
52 };
53 };
54 template <> struct arg<2> {
55 template <class A1,
56 class A2,
57 class A3=mpl::none,
58 class A4=mpl::none,
59 class A5=mpl::none>
60 struct apply {
61 typedef A2 type;
62 };
63 };
64 template <> struct arg<3> {
65 template <class A1,
66 class A2,
67 class A3,
68 class A4=mpl::none,
69 class A5=mpl::none>
70 struct apply {
71 typedef A3 type;
72 };
73 };
74 template <> struct arg<4> {
75 template <class A1,
76 class A2,
77 class A3,
78 class A4,
79 class A5=mpl::none>
80 struct apply {
81 typedef A4 type;
82 };
83 };
84 template <> struct arg<5> {
85 template <class A1,
86 class A2,
87 class A3,
88 class A4,
89 class A5>
90 struct apply {
91 typedef A5 type;
92 };
93 };
94
95 // Placeholder synonyms
96 namespace placeholders {
97 typedef arg<1> _1;
98 typedef arg<2> _2;
99 typedef arg<3> _3;
100 typedef arg<4> _4;
101 typedef arg<5> _5;
102 typedef arg<-1> _;
103 } // namespace placeholders
104
105 } // namespace mpl
106
107} // namespace Sacado
108
109#endif // SACADO_MPL_PLACEHOLDERS_HPP