osprey/be/lno/infin.h

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/*

  Copyright (C) 2000, 2001 Silicon Graphics, Inc.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement 
  or the like.  Any license provided herein, whether implied or 
  otherwise, applies only to this software file.  Patent licenses, if 
  any, provided herein do not apply to combinations of this program with 
  other software, or any other product whatsoever.  

  You should have received a copy of the GNU General Public License along
  with this program; if not, write the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston MA 02111-1307, USA.

  Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pky,
  Mountain View, CA 94043, or:

  http://www.sgi.com

  For further information regarding this notice, see:

  http://oss.sgi.com/projects/GenInfo/NoticeExplan

*/


// -*-C++-*-

#ifndef infin_INCLUDED
#define infin_INCLUDED "infin.h"

#ifdef _KEEP_RCS_ID
static char *infin_rcs_id = infin_INCLUDED "$Revision$";
#endif /* _KEEP_RCS_ID */

#ifndef defs_INCLUDED
#include "defs.h"
#endif
#ifndef errors_INCLUDED
#include "errors.h"
#endif

class INT32_INFIN {
  INT32 _val;
  enum {INFINITE = 2147483647,NEGINFINITE = -2147483647-1};
public:

  INT32_INFIN(const INT32 i) { _val = i; }
  INT32_INFIN() { _val = 0; }
  INT32_INFIN(const INT32_INFIN& i) { _val = i._val; }
  BOOL Is_Infinite() const { return(_val == INFINITE); }
  void Set_Infinite() { _val = INFINITE; }
  BOOL Is_Neg_Infinite() const { return(_val == NEGINFINITE); }
  void Set_Neg_Infinite() { _val = NEGINFINITE; }
  INT32 Value() { return _val; }

  INT32_INFIN &operator =(const INT32_INFIN i) { _val = i._val; return(*this);}
  friend inline INT32_INFIN operator +(const INT32_INFIN ,const INT32_INFIN) ;
  inline INT32_INFIN operator -() const;
  friend inline INT32_INFIN operator -(const INT32_INFIN, const INT32_INFIN) ;
  friend inline INT32_INFIN operator *(const INT32_INFIN, const INT32_INFIN) ;

  friend inline BOOL operator >(const INT32_INFIN, const INT32_INFIN) ;
  friend inline BOOL operator >=(const INT32_INFIN, const INT32_INFIN) ;
  friend inline BOOL operator <(const INT32_INFIN, const INT32_INFIN) ;
  friend inline BOOL operator <=(const INT32_INFIN, const INT32_INFIN) ;
  friend inline BOOL operator ==(const INT32_INFIN, const INT32_INFIN) ;
  friend inline BOOL operator !=(const INT32_INFIN, const INT32_INFIN) ;

  void Print(FILE *fp) const {
    if (this->Is_Infinite()) {
      fprintf(fp," infinite ");
    } else if (this->Is_Neg_Infinite()) {
      fprintf(fp," -infinite ");
    } else {
      fprintf(fp," %d ",_val);
    }
  }

};



inline INT32_INFIN operator +(const INT32_INFIN a, const INT32_INFIN b) 
{

  if (a.Is_Infinite()  || b.Is_Infinite()) {
    return INT32_INFIN::INFINITE; 
  } else if (a.Is_Neg_Infinite()  || b.Is_Neg_Infinite()) {
    return INT32_INFIN::NEGINFINITE; 
  } else {
    return(a._val+b._val);
  }
}

inline INT32_INFIN INT32_INFIN::operator -() const
{

  if (this->Is_Infinite()) { 
    return NEGINFINITE; 
  } else if (this->Is_Neg_Infinite()) {
    return INFINITE; 
  } else {
    return(-_val);
  }
}

inline INT32_INFIN operator -(const INT32_INFIN a, const INT32_INFIN b) 
{
  return(a + -b);
}

inline INT32_INFIN operator *(const INT32_INFIN a, const INT32_INFIN b) 
{
  INT64 prod = (INT64)a._val * (INT64)b._val;
  if (prod >= (INT64) INT32_INFIN::INFINITE) {
    return INT32_INFIN::INFINITE;
  } else if (prod <= (INT64) INT32_INFIN::NEGINFINITE) {
    return INT32_INFIN::NEGINFINITE;
  } else {
    return((INT32) prod);
  }
}

inline BOOL operator >(const INT32_INFIN a, const INT32_INFIN b) 
{
  return(a._val > b._val);
}

inline BOOL operator >=(const INT32_INFIN a, const INT32_INFIN b) 
{
  return(a._val >= b._val);
}

inline BOOL operator <(const INT32_INFIN a, const INT32_INFIN b) 
{
  return(a._val < b._val);
}

inline BOOL operator <=(const INT32_INFIN a, const INT32_INFIN b) 
{
  return(a._val <= b._val);
}

inline BOOL operator ==(const INT32_INFIN a, const INT32_INFIN b) 
{
  return(a._val == b._val);
}

inline BOOL operator !=(const INT32_INFIN a, const INT32_INFIN b) 
{
  return(a._val != b._val);
}


#endif

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