// Copyright (c) 1998-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _Standard_ShortReal_HeaderFile
#define _Standard_ShortReal_HeaderFile

#include <cmath>
#include <float.h>

#include <Standard_values.h>
#include <Standard_TypeDef.hxx>

         //  *********************************** //
         //       Class methods                  //
         //                                      //
         //  Machine-dependent values            //
         //  Should be taken from include file   //
         //  *********************************** //

//-------------------------------------------------------------------
// ShortRealSmall : Returns the smallest positive ShortReal
//-------------------------------------------------------------------
inline Standard_ShortReal     ShortRealSmall() 
{ return FLT_MIN; }

//-------------------------------------------------------------------
// Abs : Returns the absolute value of a ShortReal
//-------------------------------------------------------------------
inline Standard_ShortReal     Abs(const Standard_ShortReal Value) 
#if defined (__alpha) || defined(DECOSF1)
{ return fabsf(Value); }
#else
{ return float( fabs (Value) ) ; }
#endif

//-------------------------------------------------------------------
// ShortRealDigit : Returns the number of digits of precision in a ShortReal
//-------------------------------------------------------------------
inline Standard_Integer  ShortRealDigits() 
{ return FLT_DIG; }

//-------------------------------------------------------------------
// ShortRealEpsilon : Returns the minimum positive ShortReal such that 
//               1.0 + x is not equal to 1.0
//-------------------------------------------------------------------
inline Standard_ShortReal     ShortRealEpsilon() 
{ return FLT_EPSILON; }

//-------------------------------------------------------------------
// ShortRealFirst : Returns the minimum negative value of a ShortReal
//-------------------------------------------------------------------
inline Standard_ShortReal     ShortRealFirst() 
{ Standard_ShortReal MaxFloatTmp = -FLT_MAX;
  return MaxFloatTmp; }
  
//-------------------------------------------------------------------
// ShortRealFirst10Exp : Returns the minimum value of exponent(base 10) of
//                  a ShortReal.
//-------------------------------------------------------------------
inline Standard_Integer  ShortRealFirst10Exp() 
{ return FLT_MIN_10_EXP; }

//-------------------------------------------------------------------
// ShortRealLast : Returns the maximum value of a ShortReal
//-------------------------------------------------------------------
inline Standard_ShortReal     ShortRealLast() 
{ return  FLT_MAX; }

//-------------------------------------------------------------------
// ShortRealLast10Exp : Returns the maximum value of exponent(base 10) of
//                 a ShortReal.
//-------------------------------------------------------------------
inline Standard_Integer  ShortRealLast10Exp() 
{ return  FLT_MAX_10_EXP; }

//-------------------------------------------------------------------
// ShortRealMantissa : Returns the size in bits of the matissa part of a 
//                ShortReal.
//-------------------------------------------------------------------
inline Standard_Integer  ShortRealMantissa() 
{ return  FLT_MANT_DIG; }

//-------------------------------------------------------------------
// ShortRealRadix : Returns the radix of exponent representation
//-------------------------------------------------------------------
inline Standard_Integer  ShortRealRadix() 
{ return  FLT_RADIX; }

//-------------------------------------------------------------------
// ShortRealSize : Returns the size in bits of an integer
//-------------------------------------------------------------------
inline Standard_Integer  ShortRealSize() 
{ return BITS(Standard_ShortReal); }

//-------------------------------------------------------------------
// Max : Returns the maximum value of two ShortReals
//-------------------------------------------------------------------
inline Standard_ShortReal     Max (const Standard_ShortReal Val1, 
				   const Standard_ShortReal Val2) 
{
  if (Val1 >= Val2) {
    return Val1;
  } else {
    return Val2;
  }
}

//-------------------------------------------------------------------
// Min : Returns the minimum value of two ShortReals
//-------------------------------------------------------------------
inline Standard_ShortReal     Min (const Standard_ShortReal Val1, 
				   const Standard_ShortReal Val2)
{
  if (Val1 <= Val2) {
    return Val1;
  } else {
    return Val2;
  }
}

// ===============================================
// Methods from Standard_Entity class which are redefined:  
//    - Hascode
//    - IsEqual
// ===============================================

// ==================================
// Methods implemented in Standard_ShortReal.cxx
// ==================================

//! Computes a hash code for the given short real, in the range [1, theUpperBound]
//! @param theShortReal the short real value which hash code is to be computed
//! @param theUpperBound the upper bound of the range a computing hash code must be within
//! @return a computed hash code, in the range [1, theUpperBound]
Standard_EXPORT Standard_Integer HashCode (Standard_ShortReal theShortReal, Standard_Integer theUpperBound);

//-------------------------------------------------------------------
// IsEqual : Returns Standard_True if two ShortReals are equal
//-------------------------------------------------------------------
inline Standard_Boolean  IsEqual (const Standard_ShortReal Value1, 
				  const Standard_ShortReal Value2) 
{ return Abs((Value1 - Value2)) < ShortRealSmall(); }

#endif


