1/*
2 Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
3
4 This file is part of libzmq, the ZeroMQ core engine in C++.
5
6 libzmq is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 As a special exception, the Contributors give you permission to link
12 this library with independent modules to produce an executable,
13 regardless of the license terms of these independent modules, and to
14 copy and distribute the resulting executable under terms of your choice,
15 provided that you also meet, for each linked independent module, the
16 terms and conditions of the license of that module. An independent
17 module is a module which is not derived from or based on this library.
18 If you modify this library, you must extend this exception to your
19 version of the library.
20
21 libzmq is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24 License for more details.
25
26 You should have received a copy of the GNU Lesser General Public License
27 along with this program. If not, see <http://www.gnu.org/licenses/>.
28*/
29
30#ifndef __ZMQ_TRIE_HPP_INCLUDED__
31#define __ZMQ_TRIE_HPP_INCLUDED__
32
33#include <stddef.h>
34
35#include "macros.hpp"
36#include "stdint.hpp"
37
38namespace zmq
39{
40class trie_t
41{
42 public:
43 trie_t ();
44 ~trie_t ();
45
46 // Add key to the trie. Returns true if this is a new item in the trie
47 // rather than a duplicate.
48 bool add (unsigned char *prefix_, size_t size_);
49
50 // Remove key from the trie. Returns true if the item is actually
51 // removed from the trie.
52 bool rm (unsigned char *prefix_, size_t size_);
53
54 // Check whether particular key is in the trie.
55 bool check (unsigned char *data_, size_t size_);
56
57 // Apply the function supplied to each subscription in the trie.
58 void apply (void (*func_) (unsigned char *data_, size_t size_, void *arg_),
59 void *arg_);
60
61 private:
62 void apply_helper (unsigned char **buff_,
63 size_t buffsize_,
64 size_t maxbuffsize_,
65 void (*func_) (unsigned char *data_,
66 size_t size_,
67 void *arg_),
68 void *arg_) const;
69 bool is_redundant () const;
70
71 uint32_t _refcnt;
72 unsigned char _min;
73 unsigned short _count;
74 unsigned short _live_nodes;
75 union
76 {
77 class trie_t *node;
78 class trie_t **table;
79 } _next;
80
81 ZMQ_NON_COPYABLE_NOR_MOVABLE (trie_t)
82};
83}
84
85#endif
86