libstdc++-v3/testsuite/util/hash_fn/string_ranged_probe_fn.hpp

   1 // -*- C++ -*-
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   3 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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   5 // This file is part of the GNU ISO C++ Library.  This library is free
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   7 // of the GNU General Public License as published by the Free Software
   8 // Foundation; either version 2, or (at your option) any later
   9 // version.
  10
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  12 // WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // General Public License for more details.
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  16 // You should have received a copy of the GNU General Public License
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  18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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  21 // As a special exception, you may use this file as part of a free
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  23 // instantiate templates or use macros or inline functions from this
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  26 // resulting executable to be covered by the GNU General Public
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  28 // reasons why the executable file might be covered by the GNU General
  29 // Public License.
  30
  31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  32
  33 // Permission to use, copy, modify, sell, and distribute this software
  34 // is hereby granted without fee, provided that the above copyright
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  41
  42 /**
  43  * @file string_ranged_probe_fn.hpp
  44  * Contains a ranged string probe function.
  45  */
  46
  47 #ifndef PB_DS_STRING_RANGED_PROBE_FN_HPP
  48 #define PB_DS_STRING_RANGED_PROBE_FN_HPP
  49
  50 #include <string>
  51
  52 namespace __gnu_pbds
  53 {
  54   namespace test
  55   {
  56     template<typename Comb_Fn, typename Probe_Fn>
  57     class string_ranged_probe_fn : public Probe_Fn, public Comb_Fn
  58     {
  59     private:
  60       size_t _M_limit;
  61
  62     public:
  63       typedef Comb_Fn comb_fn;
  64       typedef Probe_Fn probe_fn;
  65       typedef detail::comb_hash_fn_string_form<comb_fn> string_form;
  66
  67       inline size_t
  68       operator()(const std::string& r_str) const
  69       {
  70         size_t ret = 0;
  71         std::string::const_iterator b = r_str.begin();
  72         std::string::const_iterator e = r_str.end();
  73
  74         size_t i = 0;
  75         while (i < _M_limit&&  b != e)
  76           {
  77             ret *= 5;
  78             ret += static_cast<size_t>(*(b++));
  79             ++i;
  80           }
  81         return (comb_fn::operator()(ret));
  82       }
  83
  84       inline size_t
  85       operator()(const std::string&, const size_t hash, size_t i) const
  86       { return comb_fn::operator()(hash + probe_fn::operator()(i)); }
  87
  88       void
  89       swap(string_ranged_probe_fn<Comb_Fn, Probe_Fn>& other)
  90       {
  91         std::swap(_M_limit, other._M_limit);
  92         comb_fn::swap(other);
  93       }
  94
  95       void
  96       notify_resized(size_t new_size)
  97       {
  98         comb_fn::notify_resized(new_size);
  99         _M_limit = dna_str_limit(new_size);
 100       }
 101
 102       static std::string
 103       name()
 104       { return ("string_ranged_probe_fn_" + string_form<comb_fn>::name()); }
 105
 106       static std::string
 107       desc()
 108       { return ("string ranged-probe using" + string_form<comb_fn>::desc());}
 109     };
 110   } // namespace test
 111 } // namespace __gnu_pbds
 112
 113 #endif