1 /* 2 3 Copyright (c) 2011-2018, Arvid Norberg 4 All rights reserved. 5 6 Redistribution and use in source and binary forms, with or without 7 modification, are permitted provided that the following conditions 8 are met: 9 10 * Redistributions of source code must retain the above copyright 11 notice, this list of conditions and the following disclaimer. 12 * Redistributions in binary form must reproduce the above copyright 13 notice, this list of conditions and the following disclaimer in 14 the documentation and/or other materials provided with the distribution. 15 * Neither the name of the author nor the names of its 16 contributors may be used to endorse or promote products derived 17 from this software without specific prior written permission. 18 19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 23 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 POSSIBILITY OF SUCH DAMAGE. 30 31 */ 32 33 #ifndef TORRENT_LINK_HPP_INCLUDED 34 #define TORRENT_LINK_HPP_INCLUDED 35 36 #include "libtorrent/aux_/vector.hpp" 37 #include "libtorrent/units.hpp" 38 39 namespace libtorrent { 40 41 using torrent_list_index_t = aux::strong_typedef<int, struct torrent_list_tag>; 42 43 struct link 44 { linklibtorrent::link45 link() : index(-1) {} 46 // this is either -1 (not in the list) 47 // or the index of where in the list this 48 // element is found 49 int index; 50 in_listlibtorrent::link51 bool in_list() const { return index >= 0; } 52 clearlibtorrent::link53 void clear() { index = -1; } 54 55 template <class T> unlinklibtorrent::link56 void unlink(aux::vector<T*>& list 57 , torrent_list_index_t const link_index) 58 { 59 if (index == -1) return; 60 TORRENT_ASSERT(index >= 0 && index < int(list.size())); 61 int const last = int(list.size()) - 1; 62 if (index < last) 63 { 64 list[last]->m_links[link_index].index = index; 65 list[index] = list[last]; 66 } 67 list.resize(last); 68 index = -1; 69 } 70 71 template <class T> insertlibtorrent::link72 void insert(aux::vector<T*>& list, T* self) 73 { 74 if (index >= 0) return; 75 TORRENT_ASSERT(index == -1); 76 list.push_back(self); 77 index = int(list.size()) - 1; 78 } 79 }; 80 } 81 82 #endif 83