00001 // database field container -*- C++ -*- 00002 // $Id: field.h,v 1.1 2004/01/28 21:21:07 roger Exp $ 00003 // 00004 // Copyright (C) 2003 Roger Leigh <rleigh@debian.org> 00005 // 00006 // 00007 // All rights reserved. 00008 // 00009 // Redistribution and use in source and binary forms, with or without 00010 // modification, are permitted provided that the following conditions 00011 // are met: 00012 // 00013 // * Redistributions of source code must retain the above copyright 00014 // notice, this list of conditions and the following disclaimer. 00015 // * Redistributions in binary form must reproduce the above 00016 // copyright notice, this list of conditions and the following 00017 // disclaimer in the documentation and/or other materials provided 00018 // with the distribution. 00019 // * Neither the name of the author, nor the names of other 00020 // contributors may be used to endorse or promote products derived 00021 // from this software without specific prior written permission. 00022 // 00023 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 00024 // CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 00025 // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00026 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00027 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 00028 // BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00029 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00030 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00031 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 00032 // ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 00033 // TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 00034 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00035 // SUCH DAMAGE. 00036 // 00038 00039 #ifndef PQXX_OBJECT_FIELD_H 00040 #define PQXX_OBJECT_FIELD_H 00041 00042 #include <sigc++/signal.h> 00043 00044 namespace pqxxobject 00045 { 00057 template<typename T> 00058 class field 00059 { 00060 public: 00061 typedef T value_type; 00062 00064 field(): 00065 m_value() 00066 {} 00067 00069 field(const value_type& value): 00070 m_value(value) 00071 {} 00072 00074 field(const field<value_type>& rhs): 00075 m_value(rhs.m_value), 00076 m_signal_changed() 00077 {} 00078 00079 virtual ~field() 00080 {} 00081 00083 const value_type *operator -> () const 00084 { 00085 return &m_value; 00086 } 00087 00088 const value_type& operator * () const 00089 { 00090 return m_value; 00091 } 00092 00094 field<value_type>& operator = (const field<value_type>& rhs) 00095 { 00096 set_value(rhs.m_value); 00097 return *this; 00098 } 00099 00101 field<value_type>& operator = (const value_type& rhs) 00102 { 00103 set_value(rhs); 00104 return *this; 00105 } 00106 00108 operator const value_type& () const 00109 { 00110 return m_value; 00111 } 00112 00117 value_type& get_value() 00118 { 00119 return m_value; 00120 } 00121 00126 const value_type& get_value() const 00127 { 00128 return m_value; 00129 } 00130 00135 void set_value(const value_type& value) 00136 { 00137 m_value = value; 00138 m_signal_changed.emit(); 00139 } 00140 00155 SigC::Signal0<void>& signal_changed() 00156 { 00157 return m_signal_changed; 00158 } 00159 00160 private: 00162 value_type m_value; 00164 SigC::Signal0<void> m_signal_changed; 00165 00166 }; // class field 00167 00168 }; // namespace pqxxobject 00169 00170 #endif // PQXX_OBJECT_FIELD_H