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