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pqxx-object/column.h

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00001 // database column container                                     -*- C++ -*-
00002 // $Id: row_base.h,v 1.2 2004/01/07 14:29:39 roger Exp $
00003 //
00004 // Copyright (C) 2003  Roger Leigh <rleigh@debian.org>
00005 //
00006 //
00007 // This program is free software; you can redistribute it and/or modify
00008 // it under the terms of the GNU General Public License as published by
00009 // the Free Software Foundation; either version 2 of the License, or
00010 // (at your option) any later version.
00011 //
00012 // This program is distributed in the hope that it will be useful,
00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015 // GNU General Public License for more details.
00016 //
00017 // You should have received a copy of the GNU General Public License
00018 // along with this program; if not, write to the Free Software
00019 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00020 
00021 #ifndef PQXX_OBJECT_COLUMN_H
00022 #define PQXX_OBJECT_COLUMN_H
00023 
00024 #include <sigc++/signal.h>
00025 
00026 namespace pqxxobject
00027 {
00028   template<typename T>
00029   class column
00030   {
00031   public:
00032     typedef T value_type;
00033 
00035     column():
00036       m_value()
00037     {}
00038 
00040     column(const value_type& value):
00041       m_value(value)
00042     {}
00043 
00045     column(const column<value_type>& rhs):
00046       m_value(rhs.m_value),
00047       m_signal_changed()
00048     {}
00049 
00050     virtual ~column()
00051     {}
00052 
00053     column<value_type>& operator = (const column<value_type>& rhs)
00054     {
00055       set_value(rhs.m_value);
00056       return *this;
00057     }
00058 
00059     column<value_type>& operator = (const value_type& rhs)
00060     {
00061       set_value(rhs);
00062       return *this;
00063     }
00064 
00065     operator const value_type& () const
00066     {
00067       return m_value;
00068     }
00069 
00070     value_type& get_value()
00071     {
00072       return m_value;
00073     }
00074 
00075     void set_value(const value_type& value)
00076     {
00077       m_value = value;
00078       m_signal_changed.emit();
00079     }
00080 
00081     SigC::Signal0<void>& signal_changed()
00082     {
00083       return m_signal_changed;
00084     }
00085 
00086   private:
00087     value_type m_value;
00088     SigC::Signal0<void> m_signal_changed;
00089 
00090   }; // class column
00091 
00092 }; // namespace pqxxobject
00093 
00094 #endif // PQXX_OBJECT_COLUMN_H

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