# comparable.h

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    00001
    00002
    00003
    00004 /***********************************************************************
    00005  Copyright (c) 1998 by Kevin Atkinson, (c) 1999-2001 by MySQL AB, and
    00006  (c) 2004-2008 by Educational Technology Resources, Inc.  Others may
    00007  also hold copyrights on code in this file.  See the CREDITS.txt file
    00008  in the top directory of the distribution for details.
    00009
    00010  This file is part of MySQL++.
    00011
    00012  MySQL++ is free software; you can redistribute it and/or modify it
    00013  under the terms of the GNU Lesser General Public License as published
    00014  by the Free Software Foundation; either version 2.1 of the License, or
    00015  (at your option) any later version.
    00016
    00017  MySQL++ is distributed in the hope that it will be useful, but WITHOUT
    00018  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    00019  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
    00020  License for more details.
    00021
    00022  You should have received a copy of the GNU Lesser General Public
    00023  License along with MySQL++; if not, write to the Free Software
    00024  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
    00025  USA
    00026 ***********************************************************************/
    00027
    00028 #if !defined(MYSQLPP_COMPARABLE_H)
    00029 #define MYSQLPP_COMPARABLE_H
    00030
    00031 namespace mysqlpp {
    00032
    00039 template <class T>
    00040 class Comparable
    00041 {
    00042 public:
    00044         bool operator ==(const T& other) const
    00045         {
    00046                 return !compare(other);
    00047         }
    00048
    00050         bool operator !=(const T& other) const
    00051         {
    00052                 return compare(other);
    00053         }
    00054
    00056         bool operator <(const T& other) const
    00057         {
    00058                 return compare(other) < 0;
    00059         }
    00060
    00062         bool operator <=(const T& other) const
    00063         {
    00064                 return compare(other) <= 0;
    00065         }
    00066
    00068         bool operator >(const T& other) const
    00069         {
    00070                 return compare(other) > 0;
    00071         }
    00072
    00074         bool operator >=(const T& other) const
    00075         {
    00076                 return compare(other) >= 0;
    00077         }
    00078
    00079 protected:
    00087         virtual ~Comparable() { }
    00088
    00093         virtual int compare(const T& other) const = 0;
    00094 };
    00095
    00096 }
    00097
    00098 #endif // !defined(MYSQLPP_COMPARABLE_H)