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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 class csString;
00027 class csStringBase;
00028 
00035 template <class T1, class T2>
00036 class csComparator
00037 {
00038 public:
00055   static int Compare(T1 const &r1, T2 const &r2)
00056   {
00057     if (r1 < r2) return -1;
00058     else if (r2 < r1) return 1;
00059     else return 0;
00060   }
00061 };
00062 
00072 template <class T>
00073 class csComparatorString
00074 {
00075 public:
00076   static int Compare (T const& r1, T const& r2)
00077   {
00078     if (((const char*)r1) == 0)
00079     {
00080       return (((const char*)r2) == 0) ? 0 : 1;
00081     }
00082     else if (((const char*)r2) == 0)
00083     {
00084       return -1;
00085     }
00086     return strcmp ((const char*)r1, (const char*)r2);
00087   }
00088 };
00089 
00093 template<>
00094 class csComparator<const char*, const char*> :
00095   public csComparatorString<const char*> {};
00096 
00101 template<>
00102 class csComparator<csString, csString> :
00103   public csComparatorString<csString> {};
00104 template<>
00105 class csComparator<csStringBase, csStringBase> :
00106   public csComparatorString<csStringBase> {};
00118 template<class T>
00119 class csComparatorStruct
00120 {
00121 public:
00122   static int Compare (T const& r1, T const& r2)
00123   {
00124     return memcmp (&r1, &r2, sizeof (T));
00125   }
00126 };
00127 
00130 #endif // __CSUTIL_COMPARATOR_H__

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