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+/*
+ Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
+
+ This file is part of libzmq, the ZeroMQ core engine in C++.
+
+ libzmq is free software; you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License (LGPL) as published
+ by the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ As a special exception, the Contributors give you permission to link
+ this library with independent modules to produce an executable,
+ regardless of the license terms of these independent modules, and to
+ copy and distribute the resulting executable under terms of your choice,
+ provided that you also meet, for each linked independent module, the
+ terms and conditions of the license of that module. An independent
+ module is a module which is not derived from or based on this library.
+ If you modify this library, you must extend this exception to your
+ version of the library.
+
+ libzmq is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_ARRAY_INCLUDED__
+#define __ZMQ_ARRAY_INCLUDED__
+
+#include <vector>
+#include <algorithm>
+
+namespace zmq
+{
+
+ // Base class for objects stored in the array. If you want to store
+ // same object in mutliple arrays, each of those arrays has to have
+ // different ID. The item itself has to be derived from instantiations of
+ // array_item_t template for all relevant IDs.
+
+ template <int ID = 0> class array_item_t
+ {
+ public:
+
+ inline array_item_t () :
+ array_index (-1)
+ {
+ }
+
+ // The destructor doesn't have to be virtual. It is mad virtual
+ // just to keep ICC and code checking tools from complaining.
+ inline virtual ~array_item_t ()
+ {
+ }
+
+ inline void set_array_index (int index_)
+ {
+ array_index = index_;
+ }
+
+ inline int get_array_index ()
+ {
+ return array_index;
+ }
+
+ private:
+
+ int array_index;
+
+ array_item_t (const array_item_t&);
+ const array_item_t &operator = (const array_item_t&);
+ };
+
+ // Fast array implementation with O(1) access to item, insertion and
+ // removal. Array stores pointers rather than objects. The objects have
+ // to be derived from array_item_t<ID> class.
+
+ template <typename T, int ID = 0> class array_t
+ {
+ private:
+
+ typedef array_item_t <ID> item_t;
+
+ public:
+
+ typedef typename std::vector <T*>::size_type size_type;
+
+ inline array_t ()
+ {
+ }
+
+ inline ~array_t ()
+ {
+ }
+
+ inline size_type size ()
+ {
+ return items.size ();
+ }
+
+ inline bool empty ()
+ {
+ return items.empty ();
+ }
+
+ inline T *&operator [] (size_type index_)
+ {
+ return items [index_];
+ }
+
+ inline void push_back (T *item_)
+ {
+ if (item_)
+ ((item_t*) item_)->set_array_index ((int) items.size ());
+ items.push_back (item_);
+ }
+
+ inline void erase (T *item_) {
+ erase (((item_t*) item_)->get_array_index ());
+ }
+
+ inline void erase (size_type index_) {
+ if (items.back ())
+ ((item_t*) items.back ())->set_array_index ((int) index_);
+ items [index_] = items.back ();
+ items.pop_back ();
+ }
+
+ inline void swap (size_type index1_, size_type index2_)
+ {
+ if (items [index1_])
+ ((item_t*) items [index1_])->set_array_index ((int) index2_);
+ if (items [index2_])
+ ((item_t*) items [index2_])->set_array_index ((int) index1_);
+ std::swap (items [index1_], items [index2_]);
+ }
+
+ inline void clear ()
+ {
+ items.clear ();
+ }
+
+ inline size_type index (T *item_)
+ {
+ return (size_type) ((item_t*) item_)->get_array_index ();
+ }
+
+ private:
+
+ typedef std::vector <T*> items_t;
+ items_t items;
+
+ array_t (const array_t&);
+ const array_t &operator = (const array_t&);
+ };
+
+}
+
+#endif
+