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_PPITER_H
21 #define LIBMESH_PPITER_H
22 
23 
24 namespace libMesh
25 {
26 
27 /**
28  * The \p PointerToPointerIter templated class is intended to wrap
29  * pointer-to-pointer iterators in an interface which works more like
30  * a standard iterator, by returning a value rather than a pointer.
31  *
32  * \author  Roy H. Stogner
33  */
34 
35 template <typename T>
36 class PointerToPointerIter
37 {
38 public:
PointerToPointerIter(T * const * it)39   PointerToPointerIter (T * const * it) : _it(it) {}
40 
41   T & operator* () const { return **_it; }
42 
43   const PointerToPointerIter & operator++ ()
44   {
45     ++_it;
46     return *this;
47   }
48 
49   PointerToPointerIter operator++ (int)
50   {
51     PointerToPointerIter returnval(*this);
52     ++_it;
53     return returnval;
54   }
55 
56   bool operator== (const PointerToPointerIter & j) const
57   {
58     return ( _it == j._it );
59   }
60 
61   bool operator!= (const PointerToPointerIter & j) const
62   {
63     return !(*this == j);
64   }
65 
66 private:
67   T * const * _it;
68 };
69 
70 } // namespace libMesh
71 
72 #endif // LIBMESH_PPITER_H
73