67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/* 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
|