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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__

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