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# csutil/comparator.h

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    00001 /*
    00002   Template providing various comparison and ordering functions.
    00003   Copyright (C) 2005 by Eric Sunshine
    00004
    00005   This library is free software; you can redistribute it and/or
    00006   modify it under the terms of the GNU Library General Public
    00007   License as published by the Free Software Foundation; either
    00008   version 2 of the License, or (at your option) any later version.
    00009
    00010   This library is distributed in the hope that it will be useful,
    00011   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013   Library General Public License for more details.
    00014
    00015   You should have received a copy of the GNU Library General Public
    00016   License along with this library; if not, write to the Free
    00017   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00018 */
    00019 #ifndef __CSUTIL_COMPARATOR_H__
    00020 #define __CSUTIL_COMPARATOR_H__
    00021
    00026 #include "csstring.h"
    00027
    00034 template <class T1, class T2>
    00035 class csComparator
    00036 {
    00037 public:
    00054   static int Compare(T1 const &r1, T2 const &r2)
    00055   {
    00056     if (r1 < r2) return -1;
    00057     else if (r2 < r1) return 1;
    00058     else return 0;
    00059   }
    00060 };
    00061
    00071 template <class T>
    00072 class csComparatorString
    00073 {
    00074 public:
    00075   static int Compare (T const& r1, T const& r2)
    00076   {
    00077     return strcmp ((const char*)r1, (const char*)r2);
    00078   }
    00079 };
    00080
    00084 CS_SPECIALIZE_TEMPLATE
    00085 class csComparator<const char*, const char*> :
    00086   public csComparatorString<const char*> {};
    00087
    00092 CS_SPECIALIZE_TEMPLATE
    00093 class csComparator<csString, csString> :
    00094   public csComparatorString<csString> {};
    00095 CS_SPECIALIZE_TEMPLATE
    00096 class csComparator<csStringBase, csStringBase> :
    00097   public csComparatorString<csStringBase> {};
    00109 template<class T>
    00110 class csComparatorStruct
    00111 {
    00112 public:
    00113   static int Compare (T const& r1, T const& r2)
    00114   {
    00115     return memcmp (&r1, &r2, sizeof (T));
    00116   }
    00117 };
    00118
    00121 #endif // __CSUTIL_COMPARATOR_H__