1// -*- C++ -*- 2 3// Copyright (C) 2005 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 2, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING. If not, write to the Free 18// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19// USA. 20 21// As a special exception, you may use this file as part of a free software 22// library without restriction. Specifically, if other files instantiate 23// templates or use macros or inline functions from this file, or you compile 24// this file and link it with other files to produce an executable, this 25// file does not by itself cause the resulting executable to be covered by 26// the GNU General Public License. This exception does not however 27// invalidate any other reasons why the executable file might be covered by 28// the GNU General Public License. 29 30// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 31 32// Permission to use, copy, modify, sell, and distribute this software 33// is hereby granted without fee, provided that the above copyright 34// notice appears in all copies, and that both that copyright notice and 35// this permission notice appear in supporting documentation. None of 36// the above authors, nor IBM Haifa Research Laboratories, make any 37// representation about the suitability of this software for any 38// purpose. It is provided "as is" without express or implied warranty. 39 40/** 41 * @file hash_mod_example.cpp 42 * An example showing how to use a mod range-hasing function 43 */ 44 45// For cc_hash_assoc_cntnr. 46#include <ext/pb_assoc/assoc_cntnr.hpp> 47// For direct_mask_range_hashing and hash_standard_resize_policy. 48#include <ext/pb_assoc/hash_policy.hpp> 49// For unary_function, binary_function. 50#include <functional> 51/* 52 * A simple hash functor. 53 * std::hash could serve instead of this functor, 54 * but it is not yet standard everywhere. 55 */ 56struct int_hash : public std::unary_function< 57 int, 58 size_t> 59{ 60 inline size_t 61 operator()(int i) const 62 { 63 return (i); 64 } 65}; 66 67int 68main() 69{ 70 /* 71 * A collision-chaining hash table mapping ints to chars. 72 */ 73 typedef 74 pb_assoc::cc_hash_assoc_cntnr< 75 int, 76 char, 77 int_hash, 78 std::equal_to<int>, 79 // Combining function. 80 pb_assoc::direct_mod_range_hashing<> > 81 map_t; 82 83 map_t c; 84 85 c[32] = 'b'; 86 c[1024] = 'c'; 87 c[4096] = 'd'; 88} 89 90