kjs Library API Documentation

simple_number.h

00001 // -*- c-basic-offset: 2 -*- 00002 /* 00003 * This file is part of the KDE libraries 00004 * Copyright (C) 2003 Apple Computer, Inc 00005 * 00006 * This library is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Library General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2 of the License, or (at your option) any later version. 00010 * 00011 * This library is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Library General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Library General Public License 00017 * along with this library; see the file COPYING.LIB. If not, write to 00018 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 00019 * Boston, MA 02111-1307, USA. 00020 * 00021 */ 00022 00023 #ifndef _KJS_SIMPLE_NUMBER_H_ 00024 #define _KJS_SIMPLE_NUMBER_H_ 00025 00026 #include <limits.h> 00027 #include <math.h> 00028 #include <string.h> 00029 00030 #define IS_NEGATIVE_ZERO(num) (num == 0.0 && !memcmp(&num,&SimpleNumber::negZero,sizeof(double))) 00031 00032 namespace KJS { 00033 class ValueImp; 00034 00035 class SimpleNumber { 00036 public: 00037 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 }; 00038 00039 static inline bool is(const ValueImp *imp) { return ((long)imp & mask) == tag; } 00040 static inline long value(const ValueImp *imp) { return ((long)imp >> shift) | (((long)imp & sign) ? ~max : 0); } 00041 00042 static inline bool fits(int i) { return i <= imax && i >= imin; } 00043 static inline bool fits(unsigned i) { return i <= (unsigned)max; } 00044 static inline bool fits(long i) { return i <= max && i >= min; } 00045 static inline bool fits(unsigned long i) { return i <= (unsigned)max; } 00046 static inline bool fits(double d) { return d <= max && d >= min && d == (double)(long)d && 00047 !IS_NEGATIVE_ZERO(d); } 00048 static inline ValueImp *make(long i) { return (ValueImp *)((i << shift) | tag); } 00049 00050 static double negZero; 00051 00052 }; 00053 } 00054 00055 #endif
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This file is part of the documentation for kjs Library Version 3.2.3.
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