const_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 
19 #ifndef LIBMESH_CONST_FUNCTION_H
20 #define LIBMESH_CONST_FUNCTION_H
21 
22 // Local includes
23 #include "libmesh/dense_vector.h"
24 #include "libmesh/function_base.h"
25 #include "libmesh/point.h"
26 
27 // C++ includes
28 #include <string>
29 
30 namespace libMesh {
31 
32 template <typename Output=Number>
33 class ConstFunction : public FunctionBase<Output>
34 {
35 public:
36  explicit
37  ConstFunction (const Output &c) : _c(c) { this->_initialized = true; }
38 
39  virtual Output operator() (const Point&,
40  const Real = 0)
41  { return _c; }
42 
43  virtual void operator() (const Point&,
44  const Real,
45  DenseVector<Output>& output)
46  {
47  unsigned int size = output.size();
48  for (unsigned int i=0; i != size; ++i)
49  output(i) = _c;
50  }
51 
52  virtual AutoPtr<FunctionBase<Output> > clone() const {
55  }
56 
57 private:
58  Output _c;
59 };
60 
61 } // namespace libMesh
62 
63 #endif // LIBMESH_CONST_FUNCTION_H

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