9.6 Example with saveOn()and restoreFrom()

FILENAME: example5.cpp

Program:

/*

 * Example program showing the use of the member
 * functions saveOn() and restoreFrom() for data
 * storage and retrieval.
 */ 

#include <rw/math/mathvec.h>
#include <rw/pstream.h>
#include <fstream.h>

main()
{
/*
 * Construct an integer vector a, with 24 elements.
 * The first element has value 0; each succeeding element 
 * is incremented by 1.
 */

   RWMathVec<int> a(24, 0, 1);

   // Store the vector to file "vec.dat" using class
   // RWpostream which saves in a portable ASCII format.
   {
      ofstream fstr("vec.dat", ios::out);
      RWpostream postr(fstr);
      a.saveOn(postr);
   }

   // A vector that has been saved using function saveOn()
   // may be restored using restoreFrom().

   ifstream fstr("vec.dat", ios::in);
   // Construct a RWpistream from fstr:
   RWpistream pistr(fstr);
   RWMathVec<int> b;
   b.restoreFrom(pistr);           // Restore from file "vec.dat"

   cout << a << endl; // Print the original 'a'
   cout << b << endl; // Print the restored 'b'
}

Program Output:

[
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
20 21 22 23
]
[
0 1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19
20 21 22 23
]

You may also want to look at file vec.dat to see the storage format.