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Sacado_mpl_type_wrap.hpp
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1// @HEADER
2// ***********************************************************************
3//
4// Sacado Package
5// Copyright (2006) Sandia Corporation
6//
7// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
8// the U.S. Government retains certain rights in this software.
9//
10// This library is free software; you can redistribute it and/or modify
11// it under the terms of the GNU Lesser General Public License as
12// published by the Free Software Foundation; either version 2.1 of the
13// License, or (at your option) any later version.
14//
15// This library is distributed in the hope that it will be useful, but
16// WITHOUT ANY WARRANTY; without even the implied warranty of
17// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18// Lesser General Public License for more details.
19//
20// You should have received a copy of the GNU Lesser General Public
21// License along with this library; if not, write to the Free Software
22// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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24// Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
25// (etphipp@sandia.gov).
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27// ***********************************************************************
28// @HEADER
29
30#ifndef SACADO_MPL_TYPE_WRAP_HPP
31#define SACADO_MPL_TYPE_WRAP_HPP
32
34
35namespace Sacado {
36
37 namespace mpl {
38
39 // Wrap a type T so that it becomes a metafunction if it isn't already
40
41 // We should check if T is a class type and derive add_type from T if
42 // it is. This would allow us to use type_wrap in mpl_if since we assume
43 // mpl_if<cond,T1,T2> is derived from T1 or T2 in mpl_find.
44 template <class T> struct add_type { typedef T type; };
45
46 // Don't use mpl_if because it uses type_wrap in its implementation
47 // (actually not, see above).
48 template <bool cond, class T> struct type_wrap_impl {};
49 template <class T> struct type_wrap_impl<true,T> : T {};
50 template <class T> struct type_wrap_impl<false,T> : add_type<T> {};
51 template <class T> struct type_wrap :
52 type_wrap_impl< mpl::has_type<T>::value, T > {};
53
54 } // namespace mpl
55
56} // namespace Sacado
57
58#endif // SACADO_MPL_TYPE_WRAP_HPP
expr expr expr bar false
expr true
#define T
Definition: Sacado_rad.hpp:573