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Posted 8 Mar 2003

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Using UNION when porting a Fortran EQUIVALENCE code

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8 Mar 2003
Using UNION when porting a Fortran EQUIVALENCE code.

Introduction

For those of us who need to port from Fortran:

In C++ there is no equivalent structure to Fortran's EQUIVALENCE. (No pun intended!)

After doing some searching, I could not find an appropriate code, so I am suggesting the following "work-around" using the UNION structure.

The basic idea is that the same portion of the memory is accessed by different data. (Variables or data types).

#include <iostream.h> 
//========================
union mix_it
{
 struct
 {
  double a;
  double b;
  double c;
 } s;
 double x[3];
} mix; 
//=======================
void main()
{
    mix.s.a=12.1;
    mix.s.b=12.2;
    mix.s.c=12.3; 
 for (int i=0;i<3;i++) cout<<mix.x[i]<<endl;
}
//======================

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About the Author

Gabor Kalman
Web Developer
United States United States
Retired EE

Comments and Discussions

 
Generalvery good trick Pin
Southmountain20-Oct-20 5:34
MemberSouthmountain20-Oct-20 5:34 
GeneralFor those with the need... Pin
Nitron11-Mar-03 14:25
MemberNitron11-Mar-03 14:25 

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