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