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2b2be3fb82
0030551: Foundation Classes - Integer overflow in NCollection_CellFilter HashCode Signed integers are not used in hash code functions now to prevent undefined behavior on left shift operations with signed integers. A possibility of negative values of hash codes is eliminated. INT_MAX → IntegerLast() in hash code functions. All found hash code functions behaves uniformly now: they return a value in the range [1, theUpperBound]. Relevant comments are added to such functions.
158 lines
6.3 KiB
C++
158 lines
6.3 KiB
C++
// Copyright (c) 1998-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _Standard_ShortReal_HeaderFile
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#define _Standard_ShortReal_HeaderFile
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#include <cmath>
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#include <float.h>
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#include <Standard_values.h>
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#include <Standard_TypeDef.hxx>
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// *********************************** //
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// Class methods //
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// //
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// Machine-dependant values //
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// Should be taken from include file //
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// *********************************** //
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//-------------------------------------------------------------------
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// ShortRealSmall : Returns the smallest positive ShortReal
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//-------------------------------------------------------------------
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inline Standard_ShortReal ShortRealSmall()
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{ return FLT_MIN; }
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//-------------------------------------------------------------------
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// Abs : Returns the absolute value of a ShortReal
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//-------------------------------------------------------------------
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inline Standard_ShortReal Abs(const Standard_ShortReal Value)
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#if defined (__alpha) || defined(DECOSF1)
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{ return fabsf(Value); }
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#else
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{ return float( fabs (Value) ) ; }
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#endif
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//-------------------------------------------------------------------
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// ShortRealDigit : Returns the number of digits of precision in a ShortReal
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//-------------------------------------------------------------------
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inline Standard_Integer ShortRealDigits()
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{ return FLT_DIG; }
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//-------------------------------------------------------------------
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// ShortRealEpsilon : Returns the minimum positive ShortReal such that
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// 1.0 + x is not equal to 1.0
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//-------------------------------------------------------------------
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inline Standard_ShortReal ShortRealEpsilon()
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{ return FLT_EPSILON; }
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//-------------------------------------------------------------------
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// ShortRealFirst : Returns the minimum negative value of a ShortReal
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//-------------------------------------------------------------------
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inline Standard_ShortReal ShortRealFirst()
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{ Standard_ShortReal MaxFloatTmp = -FLT_MAX;
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return MaxFloatTmp; }
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//-------------------------------------------------------------------
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// ShortRealFirst10Exp : Returns the minimum value of exponent(base 10) of
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// a ShortReal.
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//-------------------------------------------------------------------
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inline Standard_Integer ShortRealFirst10Exp()
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{ return FLT_MIN_10_EXP; }
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//-------------------------------------------------------------------
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// ShortRealLast : Returns the maximum value of a ShortReal
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//-------------------------------------------------------------------
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inline Standard_ShortReal ShortRealLast()
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{ return FLT_MAX; }
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//-------------------------------------------------------------------
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// ShortRealLast10Exp : Returns the maximum value of exponent(base 10) of
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// a ShortReal.
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//-------------------------------------------------------------------
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inline Standard_Integer ShortRealLast10Exp()
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{ return FLT_MAX_10_EXP; }
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//-------------------------------------------------------------------
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// ShortRealMantissa : Returns the size in bits of the matissa part of a
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// ShortReal.
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//-------------------------------------------------------------------
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inline Standard_Integer ShortRealMantissa()
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{ return FLT_MANT_DIG; }
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//-------------------------------------------------------------------
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// ShortRealRadix : Returns the radix of exponent representation
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//-------------------------------------------------------------------
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inline Standard_Integer ShortRealRadix()
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{ return FLT_RADIX; }
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//-------------------------------------------------------------------
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// ShortRealSize : Returns the size in bits of an integer
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//-------------------------------------------------------------------
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inline Standard_Integer ShortRealSize()
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{ return BITS(Standard_ShortReal); }
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//-------------------------------------------------------------------
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// Max : Returns the maximum value of two ShortReals
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//-------------------------------------------------------------------
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inline Standard_ShortReal Max (const Standard_ShortReal Val1,
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const Standard_ShortReal Val2)
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{
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if (Val1 >= Val2) {
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return Val1;
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} else {
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return Val2;
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}
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}
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//-------------------------------------------------------------------
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// Min : Returns the minimum value of two ShortReals
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//-------------------------------------------------------------------
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inline Standard_ShortReal Min (const Standard_ShortReal Val1,
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const Standard_ShortReal Val2)
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{
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if (Val1 <= Val2) {
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return Val1;
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} else {
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return Val2;
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}
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}
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// ===============================================
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// Methods from Standard_Entity class which are redefined:
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// - Hascode
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// - IsEqual
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// ===============================================
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// ==================================
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// Methods implemeted in Standard_ShortReal.cxx
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// ==================================
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//! Computes a hash code for the given short real, in the range [1, theUpperBound]
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//! @param theShortReal the short real value which hash code is to be computed
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//! @param theUpperBound the upper bound of the range a computing hash code must be within
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//! @return a computed hash code, in the range [1, theUpperBound]
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Standard_EXPORT Standard_Integer HashCode (Standard_ShortReal theShortReal, Standard_Integer theUpperBound);
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//-------------------------------------------------------------------
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// IsEqual : Returns Standard_True if two ShortReals are equal
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//-------------------------------------------------------------------
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inline Standard_Boolean IsEqual (const Standard_ShortReal Value1,
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const Standard_ShortReal Value2)
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{ return Abs((Value1 - Value2)) < ShortRealSmall(); }
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#endif
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