connectedComponents_driver.h File Reference

#include <stddef.h>
#include "c_types/pgr_edge_t.h"
#include "c_types/pgr_components_rt.h"

Include dependency graph for connectedComponents_driver.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
void	do_pgr_connectedComponents (pgr_edge_t *data_edges, size_t total_edges, pgr_components_rt **return_tuples, size_t *return_count, char **log_msg, char **notice_msg, char **err_msg)

Function Documentation

do_pgr_connectedComponents()

void do_pgr_connectedComponents	(	pgr_edge_t *	data_edges,
		size_t	total_edges,
		pgr_components_rt **	return_tuples,
		size_t *	return_count,
		char **	log_msg,
		char **	notice_msg,
		char **	err_msg
	)

Definition at line 47 of file connectedComponents_driver.cpp.

                         {
    std::ostringstream log;
    std::ostringstream err;
    std::ostringstream notice;
    try {
        pgassert(!(*log_msg));
        pgassert(!(*notice_msg));
        pgassert(!(*err_msg));
        pgassert(!(*return_tuples));
        pgassert(*return_count == 0);
        pgassert(total_edges != 0);
 
        graphType gType = UNDIRECTED;
 
        log << "Working with Undirected Graph\n";
        pgrouting::UndirectedGraph undigraph(gType);
        undigraph.insert_edges(data_edges, total_edges);
        auto results(pgrouting::algorithms::pgr_connectedComponents(undigraph));
 
        auto count = results.size();
 
        if (count == 0) {
            (*return_tuples) = NULL;
            (*return_count) = 0;
            notice <<
                "No paths found between start_vid and end_vid vertices";
            return;
        }
 
        (*return_tuples) = pgr_alloc(count, (*return_tuples));
        for (size_t i = 0; i < count; i++) {
            *((*return_tuples) + i) = results[i];
        }
        (*return_count) = count;
 
        pgassert(*err_msg == NULL);
        *log_msg = log.str().empty()?
            *log_msg :
            pgr_msg(log.str().c_str());
        *notice_msg = notice.str().empty()?
            *notice_msg :
            pgr_msg(notice.str().c_str());
    } catch (AssertFailedException &except) {
        (*return_tuples) = pgr_free(*return_tuples);
        (*return_count) = 0;
        err << except.what();
        *err_msg = pgr_msg(err.str().c_str());
        *log_msg = pgr_msg(log.str().c_str());
    } catch (std::exception &except) {
        (*return_tuples) = pgr_free(*return_tuples);
        (*return_count) = 0;
        err << except.what();
        *err_msg = pgr_msg(err.str().c_str());
        *log_msg = pgr_msg(log.str().c_str());
    } catch(...) {
        (*return_tuples) = pgr_free(*return_tuples);
        (*return_count) = 0;
        err << "Caught unknown exception!";
        *err_msg = pgr_msg(err.str().c_str());
        *log_msg = pgr_msg(log.str().c_str());
    }
}

References pgrouting::graph::Pgr_base_graph< G, T_V, T_E >::insert_edges(), pgassert, pgr_alloc(), pgrouting::algorithms::pgr_connectedComponents(), pgr_free(), pgr_msg(), UNDIRECTED, and AssertFailedException::what().

Referenced by process().