79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 2, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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// MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free
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// software library without restriction. Specifically, if other files
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// instantiate templates or use macros or inline functions from this
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// file, or you compile this file and link it with other files to
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// produce an executable, this file does not by itself cause the
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// resulting executable to be covered by the GNU General Public
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// License. This exception does not however invalidate any other
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// reasons why the executable file might be covered by the GNU General
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// Public License.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file string_hash_fn.hpp
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* Contains a string hash function.
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*/
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#ifndef PB_DS_STRING_HASH_FN_HPP
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#define PB_DS_STRING_HASH_FN_HPP
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#include <string>
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namespace __gnu_pbds
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{
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namespace test
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{
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struct string_hash_fn
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{
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template<typename String_T>
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inline size_t
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operator()(const String_T& r_str) const
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{
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typedef typename String_T::const_iterator const_iterator;
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const_iterator b = r_str.begin();
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const_iterator e = r_str.end();
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size_t ret = 0;
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while (b != e)
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{
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ret *= 5;
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ret += static_cast<size_t>(*(b++));
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}
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return ret;
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}
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};
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} // namespace test
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} // namespace __gnu_pbds
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#endif
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