/* Gamelon(tm) File I/O Library Sample Code  C++ Language */

/* (C)1994 Menai Corporation(tm)  Released for public use */

/* Example 8. How to conduct a Wandering Transaction    */

/* alteration.                                          */

/* The Wandering Transaction is simply an aggregation   */

/* of multiple individual alterations. As a result, in  */

/* order to specify a Wandering Transaction, the        */

/* program need only indicate the beginning and end of  */

/* the Wandering Transaction as follows:                */

/* Beginning file layout:      */

/*  {                       }  */

/*   [2]{         }[3.14159]   */

/*       [5700304]             */

#include <stdlib.h>

#include "gfcursor.hpp"

int main(void) {

char newchar = 'u';

short i = 17;

int valid;

CURSOR *c = new CURSOR("newfile");

c>eCursorQueryValid(&valid);

if (!valid)

exit(1);

c>eCursorMoveIn();

c>eCursorMoveLast();

c>eCursorMovePrior();

c>eCursorMoveIn();

c>eCursorMovePostLast();

c>eAltBeginWanderingTransaction();

c>eAltInsert();

c>eObjWrite(newchar);

c>eCursorMoveOut();

c>eCursorMovePreFirst();

c>eAltAppend();

c>eObjWriteAggregate();

c>eCursorMoveNext();

c>eAltModify();

/* Note:  Newly added aggregate not      */

/* accessible yet. Object being modified */

/* is the data object containing '2'.    */

c>eObjWrite(i);

c>eAltCommitWanderingTransaction();

delete c;

return 0;

}

/* Ending file layout:                 */

/*  {                               }  */

/*   {}[17]{              }[3.14159]   */

/*          [5700304]['u']             */

/* Any and all individual simple or block alterations */

/* specified between the Begin Wandering Transaction  */

/* and Commit Wandering Transaction calls will be     */

/* submitted to the file as a single set of changes.  */

/* They will only be written to file if all the       */

/* specified changes can be written to file at the    */

/* same time.                                         */

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