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simple_number.h
1/*
2 * This file is part of the KDE libraries
3 * Copyright (C) 2003 Apple Computer, Inc
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef _KJS_SIMPLE_NUMBER_H_
23#define _KJS_SIMPLE_NUMBER_H_
24
25#include <math.h>
26#include <string.h>
27
28#define IS_NEGATIVE_ZERO(num) (num == 0.0 && !memcmp(&num, &SimpleNumber::negZero, sizeof(double)))
29
30namespace KJS {
31 class ValueImp;
32
33 class SimpleNumber {
34 public:
35 enum { tag = 1, shift = 2, mask = (1 << shift) - 1, sign = 1L << (sizeof(long) * 8 - 1 ), max = (1L << ((sizeof(long) * 8 - 1) - shift)) - 1, min = -max - 1, imax = (1L << ((sizeof(int) * 8 - 1) - shift)) - 1, imin = -imax - 1 };
36
37 static inline bool is(const ValueImp *imp) { return ((long)imp & mask) == tag; }
38 static inline long value(const ValueImp *imp) { return ((long)imp >> shift) | (((long)imp & sign) ? ~max : 0); }
39
40 static inline bool fits(int i) { return i <= imax && i >= imin; }
41 static inline bool fits(unsigned i) { return i <= (unsigned)max; }
42 static inline bool fits(long i) { return i <= max && i >= min; }
43 static inline bool fits(unsigned long i) { return i <= (unsigned)max; }
44 static inline bool fits(double d) { return d >= min && d <= max && d == (double)(long)d && !IS_NEGATIVE_ZERO(d); }
45 static inline ValueImp *make(long i) { return (ValueImp *)((i << shift) | tag); }
46
47 static double negZero;
48 };
49}
50
51#endif

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