/* This may look like C code, but it is really -*- C++ -*- */ /* Hash table used to check for duplicate keyword entries. Copyright (C) 1989-1998, 2000, 2002 Free Software Foundation, Inc. Written by Douglas C. Schmidt <schmidt@ics.uci.edu> and Bruno Haible <bruno@clisp.org>. This file is part of GNU GPERF. GNU GPERF 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. GNU GPERF 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 program; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef hash_table_h #define hash_table_h 1 #include "keyword.h" /* Hash table of KeywordExt* entries. Two entries are considered equal if their _selchars are the same and - if !ignore_length - if their _allchars_length are the same. */ class Hash_Table { public: /* Constructor. size is the maximum number of entries. ignore_length determines a detail in the comparison function. */ Hash_Table (unsigned int size, bool ignore_length); /* Destructor. */ ~Hash_Table (); /* Attempts to insert ITEM in the table. If there is already an equal entry in it, returns it. Otherwise inserts ITEM and returns NULL. */ KeywordExt * insert (KeywordExt *item); /* Print the table's contents. */ void dump () const; private: /* Vector of entries. */ KeywordExt ** _table; /* Size of the vector. */ unsigned int _size; /* log2(_size). */ unsigned int _log_size; /* A detail of the comparison function. */ bool const _ignore_length; /* Statistics: Number of collisions so far. */ unsigned int _collisions; /* Compares two items. */ bool equal (KeywordExt *item1, KeywordExt *item2) const; }; #endif