zero_function.h
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1 // The libMesh Finite Element Library.
2 // Copyright (C) 2002-2014 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
3 
4 // This library is free software; you can redistribute it and/or
5 // modify it under the terms of the GNU Lesser General Public
6 // License as published by the Free Software Foundation; either
7 // version 2.1 of the License, or (at your option) any later version.
8 
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 // Lesser General Public License for more details.
13 
14 // You should have received a copy of the GNU Lesser General Public
15 // License along with this library; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 
18 #ifndef LIBMESH_ZERO_FUNCTION_H
19 #define LIBMESH_ZERO_FUNCTION_H
20 
21 // Local includes
22 #include "libmesh/const_function.h"
23 
24 // C++ includes
25 
26 namespace libMesh {
27 
28 template <typename Output=Number>
29 class ZeroFunction : public ConstFunction<Output>
30 {
31 public:
32  ZeroFunction () : ConstFunction<Output>(0) {}
33 
34  virtual AutoPtr<FunctionBase<Output> > clone() const {
36  (new ZeroFunction<Output>());
37  }
38 };
39 
40 } // namespace libMesh
41 
42 #endif // LIBMESH_ZERO_FUNCTION_H

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