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HashFunction.h (Maintainer: Oliver Kohlbacher)

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00001 // -*- Mode: C++; tab-width: 2; -*-
00002 // vi: set ts=2:
00003 //
00004 // --------------------------------------------------------------------------
00005 //                   OpenMS Mass Spectrometry Framework 
00006 // --------------------------------------------------------------------------
00007 //  Copyright (C) 2003-2008 -- Oliver Kohlbacher, Knut Reinert
00008 //
00009 //  This library is free software; you can redistribute it and/or
00010 //  modify it under the terms of the GNU Lesser General Public
00011 //  License as published by the Free Software Foundation; either
00012 //  version 2.1 of the License, or (at your option) any later version.
00013 //
00014 //  This library is distributed in the hope that it will be useful,
00015 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017 //  Lesser General Public License for more details.
00018 //
00019 //  You should have received a copy of the GNU Lesser General Public
00020 //  License along with this library; if not, write to the Free Software
00021 //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 //
00023 // --------------------------------------------------------------------------
00024 // $Maintainer: Oliver Kohlbacher $
00025 // --------------------------------------------------------------------------
00026 
00027 #ifndef OPENMS_CONCEPT_HASHFUNCTION_H
00028 #define OPENMS_CONCEPT_HASHFUNCTION_H
00029 
00030 #include <OpenMS/CONCEPT/Types.h>
00031 #include <OpenMS/DATASTRUCTURES/String.h>
00032 
00033 #include <string>
00034 
00035 namespace OpenMS
00036 {
00046   template <typename T>
00047   class HashFunction
00048   {
00049     public:
00050     
00051     UInt operator () (const T& t) const throw()
00052     {
00053       return Hash(t);
00054     }
00055   };
00056 
00060   
00063   extern UInt hashPointer(void *const ptr) throw();
00064 
00067   extern UInt hashString(const char* str) throw();
00068 
00071   extern UInt hashPJWString(const char* str) throw();
00072 
00075   extern UInt hashElfString(const char* str) throw();
00076 
00084   template <typename T>
00085   inline UInt Hash(const T& key) throw()
00086   {
00087     return static_cast<UInt>((OPENMS_POINTERSIZEINT_TYPE)key);
00088   }
00089 
00094   inline UInt Hash(const String& s) throw()
00095   {
00096     return hashString(s.c_str());
00097   }
00098 
00103   inline UInt Hash(const std::string& s) throw()
00104   {
00105     return hashString(s.c_str());
00106   }
00107 
00111   inline UInt Hash(void* const& ptr) throw()
00112   {
00113     return hashPointer(ptr);
00114   }
00115 
00117     
00119 
00124   UInt getNextPrime(UInt l) throw();
00125 
00127 
00128 } // namespace OPENMS
00129 
00130 #endif // OPENMS_CONCEPT_HASHFUNCTION_H

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