developer.intra2net.com Git - libt2n/blob - src/container.hxx

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Gerd v. Egidy                                   *
   3  *   gve@intra2net.com                                                     *
   4  *                                                                         *
   5  *   This library is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU Lesser General Public License version   *
   7  *   2.1 as published by the Free Software Foundation.                     *
   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         *
  12  *   GNU 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 program; if not, write to the                 *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19 #ifndef __LIBT2N_CONTAINER
  20 #define __LIBT2N_CONTAINER
  21
  22 #include "command.hxx"
  23 #include "t2n_exception.hxx"
  24
  25 #include <iostream>
  26
  27 namespace libt2n
  28 {
  29
  30 /** @brief contains the result (return value or exception) of a executed command
  31 */
  32 class result_container
  33 {
  34     private:
  35         enum result_type_t { regular, exception } result_type;
  36
  37         result *res;
  38         t2n_exception *ex;
  39
  40         friend class boost::serialization::access;
  41         // When the class Archive corresponds to an output archive, the
  42         // & operator is defined similar to <<.  Likewise, when the class Archive
  43         // is a type of input archive the & operator is defined similar to >>.
  44         template<class Archive>
  45         void serialize(Archive & ar, const unsigned int version)
  46         {
  47             ar & BOOST_SERIALIZATION_NVP(result_type);
  48             ar & BOOST_SERIALIZATION_NVP(res);
  49             ar & BOOST_SERIALIZATION_NVP(ex);
  50         }
  51
  52     public:
  53         result_container()
  54             { res=0; ex=0; }
  55
  56         result_container(result *_res)
  57             { set_result(_res); }
  58         result_container(t2n_exception *_ex)
  59             { set_exception(_ex); }
  60
  61         void set_result(result *_res)
  62             { res=_res; ex=0; result_type=regular; }
  63         void set_exception(t2n_exception *_ex)
  64             { res=0; ex=_ex; result_type=exception; }
  65
  66         /** @brief returns the result or throw the carried exception.
  67                    ATTENTION: the result object is deleted in the destructor
  68         */
  69         result* get_result(void)
  70         {
  71             if (result_type==exception)
  72                 ex->do_throw();
  73             return res;
  74         }
  75
  76         /// deletes the carried result or exception objects
  77         ~result_container()
  78         {
  79             if (res)
  80                 delete res;
  81             if (ex)
  82                 delete ex;
  83         }
  84 };
  85
  86 /** @brief contains a command
  87 */
  88 class command_container
  89 {
  90     private:
  91         command *cmd;
  92
  93         friend class boost::serialization::access;
  94         template<class Archive>
  95         void serialize(Archive & ar, const unsigned int version)
  96         {
  97             std::cerr << "ser: command_container" << std::endl;
  98             ar & BOOST_SERIALIZATION_NVP(cmd);
  99         }
 100
 101     public:
 102         command_container()
 103             { cmd=0; }
 104         command_container(command *_cmd)
 105             { cmd=_cmd; }
 106
 107         /// return the contained command
 108         command* get_command()
 109             { return cmd; }
 110
 111         ~command_container()
 112         {
 113             if (cmd)
 114                 delete cmd;
 115         }
 116 };
 117
 118 } // namespace libt2n
 119
 120 BOOST_CLASS_TRACKING(libt2n::result_container, boost::serialization::track_never)
 121 BOOST_CLASS_TRACKING(libt2n::command_container, boost::serialization::track_never)
 122
 123 #endif
 124