1 // The libMesh Finite Element Library.
2 // Copyright (C) 2002-2020 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_SIMPLERANGE_H
21 #define LIBMESH_SIMPLERANGE_H
22
23 #include <utility>
24
25 namespace libMesh
26 {
27
28 /**
29 * The \p SimpleRange templated class is intended to make it easy to
30 * construct ranges from pairs of iterators.
31 *
32 * \author Roy H. Stogner
33 */
34
35 template <typename IndexType>
36 class SimpleRange
37 {
38 public:
SimpleRange(IndexType begin,IndexType end)39 SimpleRange(IndexType begin, IndexType end) : _begin(begin), _end(end) {}
40
begin()41 IndexType begin() const { return _begin; }
42
end()43 IndexType end () const { return _end; }
44
45 private:
46 IndexType _begin, _end;
47 };
48
49
50
51 /**
52 * Helper function that allows us to treat a homogenous pair as a
53 * range. Useful for writing range-based for loops over the pair
54 * returned by std::equal_range() and std::map::equal_range().
55 */
56 template<typename IndexType>
as_range(const std::pair<IndexType,IndexType> & p)57 SimpleRange<IndexType> as_range(const std::pair<IndexType, IndexType> & p)
58 {
59 return {p.first, p.second};
60 }
61
62
63
64 /**
65 * As above, but can be used in cases where a std::pair is not
66 * otherwise involved.
67 */
68 template<typename IndexType>
as_range(const IndexType & first,const IndexType & second)69 SimpleRange<IndexType> as_range(const IndexType & first,
70 const IndexType & second)
71 {
72 return {first, second};
73 }
74
75 } // namespace libMesh
76
77 #endif // LIBMESH_SIMPLERANGE_H
78