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BOOL-ARR.H
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1993-07-30
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/* This may look like C code, but it is really -*- C++ -*- */
/* Simple lookup table abstraction implemented as an Iteration Number Array.
Copyright (C) 1989 Free Software Foundation, Inc.
written by Douglas C. Schmidt (schmidt@ics.uci.edu)
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 1, 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 GNU GPERF; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Define and implement a simple boolean array abstraction,
uses an Iteration Numbering implementation to save on initialization time. */
#pragma once
#include <std.h>
#include "trace.h"
#ifdef LO_CAL
/* If we are on a memory diet then we'll only make these use a limited
amount of storage space. */
typedef unsigned short STORAGE_TYPE;
#else
typedef int STORAGE_TYPE;
#endif
class Bool_Array
{
private:
static STORAGE_TYPE *storage_array; /* Initialization of the index space. */
static STORAGE_TYPE iteration_number; /* Keep track of the current iteration. */
static int size; /* Keep track of array size. */
public:
Bool_Array (void);
~Bool_Array (void);
static void init (STORAGE_TYPE *buffer, STORAGE_TYPE s);
static int find (int hash_value);
static void reset (void);
};
#ifdef __OPTIMIZE__ /* efficiency hack! */
inline
Bool_Array::Bool_Array (void)
{
T (Trace t ("Bool_Array::Bool_Array");)
storage_array = 0;
iteration_number = size = 0;
}
inline void
Bool_Array::init (STORAGE_TYPE *buffer, STORAGE_TYPE s)
{
T (Trace t ("Bool_Array::init");)
size = s;
iteration_number = 1;
storage_array = buffer;
bzero (storage_array, s * sizeof *storage_array);
if (option[DEBUG])
fprintf (stderr, "\nbool array size = %d, total bytes = %d\n",
size, size * sizeof *storage_array);
}
inline int
Bool_Array::find (int index)
{
T (Trace t ("Bool_Array::find");)
if (storage_array[index] == iteration_number)
return 1;
else
{
storage_array[index] = iteration_number;
return 0;
}
}
inline void
Bool_Array::reset (void)
{
T (Trace t ("Bool_Array::reset");)
if (++iteration_number == 0)
{
if (option[DEBUG])
{
fprintf (stderr, "(re-initializing bool_array)...");
fflush (stderr);
}
iteration_number = 1;
bzero (storage_array, size * sizeof *storage_array);
if (option[DEBUG])
{
fprintf (stderr, "done\n");
fflush (stderr);
}
}
}
#endif