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csutil/hashhandlers.h

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00001 /*
00002     Copyright (C) 2003 by Jorrit Tyberghein
00003               (C) 2003 by Frank Richter
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 
00020 #ifndef __CS_UTIL_HASHHANDLERS_H__
00021 #define __CS_UTIL_HASHHANDLERS_H__
00022 
00027 #include "csextern.h"
00028 #include "hash.h"
00029 #include "ref.h"
00030 #include "util.h"
00031 
00040 class csConstCharHashKeyHandler
00041 {
00042 public:
00043   static uint32 ComputeHash (const char* const& key)
00044   {
00045     return (csHashCompute (key));
00046   }
00047 
00048   static bool CompareKeys (const char* const& key1, const char* const& key2)
00049   {
00050     return (strcmp (key1, key2) == 0);
00051   }
00052 };
00053 
00059 class csStrKey
00060 {
00061 private:
00062   char* str;
00063 
00064 public:
00065   csStrKey (const char* s) { str = csStrNew (s); }
00066   csStrKey (const csStrKey& c) { str = csStrNew (c.str); }
00067   ~csStrKey () { delete[] str; }
00068   csStrKey& operator=(const csStrKey& o)
00069   {
00070     delete[] str; str = csStrNew (o.str);
00071     return *this;
00072   }
00073   operator const char* () const { return str; }
00074 };
00075 
00082 template <class T>
00083 class csRefHashKeyHandler
00084 {
00085 public:
00086   static uint32 ComputeHash (const csRef<T>& key)
00087   {
00088     return (uint32)((T*)key);
00089   }
00090 
00091   static bool CompareKeys (const csRef<T>& key1, const csRef<T>& key2)
00092   {
00093     return ((T*)key1 == (T*)key2);
00094   }
00095 };
00096 
00100 template <class T>
00101 class csStructKeyHandler
00102 {
00103 public:
00104   static uint32 ComputeHash (const csRef<T>& key)
00105   {
00106     return csHashCompute ((char*)&key, sizeof (T));
00107   }
00108 
00109   static bool CompareKeys (const csRef<T>& key1, const csRef<T>& key2)
00110   {
00111     return (memcmp (&key1, &key2, sizeof (T)) == 0);
00112   }
00113 };
00114 
00115 #endif // __CS_UTIL_HASHHANDLERS_H__

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