null_output_iterator.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 
20 #ifndef LIBMESH_NULL_OUTPUT_ITERATOR_H
21 #define LIBMESH_NULL_OUTPUT_ITERATOR_H
22 
23 // Local includes
24 
25 // C++ includes
26 #include <iterator>
27 
28 namespace libMesh
29 {
30 
31 // A do-nothing class for templated methods that expect output
32 // iterator arguments.
33 template <typename T>
35  : std::iterator<std::output_iterator_tag, T>
36 {
37  template <typename T2>
38  void operator=(const T2&) {}
39 
41  return *this;
42  }
43 
45  return null_output_iterator(*this);
46  }
47 
48  // We don't return a reference-to-T here because we don't want to
49  // construct one or have any of its methods called.
50  null_output_iterator& operator*() { return *this; }
51 };
52 
53 } // namespace libMesh
54 
55 
56 #endif // LIBMESH_NULL_OUTPUT_ITERATOR_H

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