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_METADATA_HPP_INCLUDED__ 31 #define __ZMQ_METADATA_HPP_INCLUDED__ 32 33 #include <map> 34 #include <string> 35 36 #include "atomic_counter.hpp" 37 38 namespace zmq 39 { 40 class metadata_t 41 { 42 public: 43 typedef std::map<std::string, std::string> dict_t; 44 45 metadata_t (const dict_t &dict_); 46 47 // Returns pointer to property value or NULL if 48 // property is not found. 49 const char *get (const std::string &property_) const; 50 51 void add_ref (); 52 53 // Drop reference. Returns true iff the reference 54 // counter drops to zero. 55 bool drop_ref (); 56 57 private: 58 // Reference counter. 59 atomic_counter_t _ref_cnt; 60 61 // Dictionary holding metadata. 62 const dict_t _dict; 63 64 ZMQ_NON_COPYABLE_NOR_MOVABLE (metadata_t) 65 }; 66 } 67 68 #endif 69