Sacado_mpl_placeholders.hpp

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00001 // $Id$ 
00002 // $Source$ 
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00005 // 
00006 //                           Sacado Package
00007 //                 Copyright (2006) Sandia Corporation
00008 // 
00009 // Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
00010 // the U.S. Government retains certain rights in this software.
00011 // 
00012 // This library is free software; you can redistribute it and/or modify
00013 // it under the terms of the GNU Lesser General Public License as
00014 // published by the Free Software Foundation; either version 2.1 of the
00015 // License, or (at your option) any later version.
00016 //  
00017 // This library is distributed in the hope that it will be useful, but
00018 // WITHOUT ANY WARRANTY; without even the implied warranty of
00019 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020 // Lesser General Public License for more details.
00021 //  
00022 // You should have received a copy of the GNU Lesser General Public
00023 // License along with this library; if not, write to the Free Software
00024 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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00026 // Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
00027 // (etphipp@sandia.gov).
00028 // 
00029 // ***********************************************************************
00030 // @HEADER
00031 
00032 #ifndef SACADO_MPL_PLACEHOLDERS_HPP
00033 #define SACADO_MPL_PLACEHOLDERS_HPP
00034 
00035 #include "Sacado_mpl_none.hpp"
00036 
00037 namespace Sacado {
00038 
00039   namespace mpl {
00040 
00041     // Placeholder definitions
00042     template <int N> struct arg {};
00043 
00044     template <> struct arg<1> {
00045       template <class A1, 
00046                 class A2=mpl::none, 
00047                 class A3=mpl::none, 
00048                 class A4=mpl::none, 
00049                 class A5=mpl::none>
00050       struct apply {
00051         typedef A1 type;
00052       };
00053     };
00054     template <> struct arg<2> {
00055       template <class A1, 
00056                 class A2, 
00057                 class A3=mpl::none, 
00058                 class A4=mpl::none, 
00059                 class A5=mpl::none>
00060       struct apply {
00061         typedef A2 type;
00062       };
00063     };
00064     template <> struct arg<3> {
00065       template <class A1, 
00066                 class A2, 
00067                 class A3, 
00068                 class A4=mpl::none, 
00069                 class A5=mpl::none>
00070       struct apply {
00071         typedef A3 type;
00072       };
00073     };
00074     template <> struct arg<4> {
00075       template <class A1, 
00076                 class A2, 
00077                 class A3, 
00078                 class A4, 
00079                 class A5=mpl::none>
00080       struct apply {
00081         typedef A4 type;
00082       };
00083     };
00084     template <> struct arg<5> {
00085       template <class A1, 
00086                 class A2, 
00087                 class A3, 
00088                 class A4, 
00089                 class A5>
00090       struct apply {
00091         typedef A5 type;
00092       };
00093     };
00094 
00095     // Placeholder synonyms
00096     namespace placeholders {
00097       typedef arg<1> _1;
00098       typedef arg<2> _2;
00099       typedef arg<3> _3;
00100       typedef arg<4> _4;
00101       typedef arg<5> _5;
00102       typedef arg<-1> _;
00103     } // namespace placeholders
00104 
00105   } // namespace mpl
00106 
00107 } // namespace Sacado
00108 
00109 #endif // SACADO_MPL_PLACEHOLDERS_HPP
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