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/*****************************************************************************
*
* This MobilityDB code is provided under The PostgreSQL License.
* Copyright (c) 2016-2025, Université libre de Bruxelles and MobilityDB
* contributors
*
* MobilityDB includes portions of PostGIS version 3 source code released
* under the GNU General Public License (GPLv2 or later).
* Copyright (c) 2001-2025, PostGIS contributors
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without a written
* agreement is hereby granted, provided that the above copyright notice and
* this paragraph and the following two paragraphs appear in all copies.
*
* IN NO EVENT SHALL UNIVERSITE LIBRE DE BRUXELLES BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION,
* EVEN IF UNIVERSITE LIBRE DE BRUXELLES HAS BEEN ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* UNIVERSITE LIBRE DE BRUXELLES SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON
* AN "AS IS" BASIS, AND UNIVERSITE LIBRE DE BRUXELLES HAS NO OBLIGATIONS TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
*****************************************************************************/
/**
* @file
* @brief A simple program that illustrates the set_union aggregate function
* with integer values
*
* The program can be build as follows
* @code
* gcc -Wall -g -I/usr/local/include -o set_agg set_agg.c -L/usr/local/lib -lmeos
* @endcode
*/
#include <stdio.h> /* for printf */
#include <stdlib.h> /* for free */
/* Include the MEOS API header */
#include <meos.h>
int main()
{
/* Initialize MEOS */
meos_initialize();
/* Add some value to aggregate */
Set *agg = NULL;
for (int i = 10; i >= 0; i--)
{
agg = int_union_transfn(agg, i * 2);
agg = int_union_transfn(agg, i * 2);
}
char *agg_out = intset_out(agg);
printf("Result of the transition function: %s\n", agg_out);
Set *result = set_union_finalfn(agg);
char *result_out = intset_out(result);
printf("Result of the set union aggregation: %s\n", result_out);
/* Clean up allocated objects */
free(agg); free(agg_out); free(result); free(result_out);
/* Finalize MEOS */
meos_finalize();
/* Return */
return EXIT_SUCCESS;
}
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