Implement pgr_bridges

include/components/pgr_components.hpp

@@ -69,6 +69,10 @@ class Pgr_components {
      //! Articulation Points
      std::vector<pgr_components_rt> articulationPoints(
              G &graph);
+
+     //! Bridges
+     std::vector<pgr_components_rt> bridges(
+             G &graph);
  private:
      //! Generate Results, Vertex Version
      std::vector<pgr_components_rt> generate_results(
@@ -199,4 +203,44 @@ Pgr_components< G >::articulationPoints(
     return results; 
 }
 
+//! Bridges 
+template < class G >
+std::vector<pgr_components_rt>
+Pgr_components< G >::bridges(
+        G &graph) {
+    size_t totalNodes = num_vertices(graph.graph);
+    std::vector< int > tmp_comp(totalNodes);
+    std::vector< E > res_bridges;
+    int ini_comps = boost::connected_components(graph.graph, &tmp_comp[0]);
+
+    // perform the algorithm
+    E_i ei, ei_end;
+    for (boost::tie(ei, ei_end) = edges(graph.graph); ei != ei_end; ++ei) {
+        boost::remove_edge(*ei, graph.graph);
+
+        int now_comps = boost::connected_components(graph.graph, &tmp_comp[0]);
+        if (now_comps > ini_comps) {
+            res_bridges.push_back(*ei);
+        }
+
+        boost::add_edge(boost::source(*ei, graph.graph), 
+                        boost::target(*ei, graph.graph),
+                        graph.graph);
+    }
+
+    // get the results
+    std::vector <pgr_components_rt> results;
+    size_t totalBridges = res_bridges.size();
+    results.resize(totalBridges);
+    for (size_t i = 0; i < totalBridges; i++)
+        results[i].identifier = graph[res_bridges[i]].id;
+
+    // sort identifier
+    std::sort(results.begin(), results.end(),
+            [](const pgr_components_rt &left, const pgr_components_rt &right) {
+            return left.identifier < right.identifier; });
+
+    return results; 
+}
+
 #endif  // INCLUDE_COMPONENTS_PGR_COMPONENTS_HPP_

include/drivers/components/bridges_driver.h

@@ -0,0 +1,63 @@
+/*PGR-GNU*****************************************************************
+File: bridges_driver.h
+
+Generated with Template by:
+Copyright (c) 2015 pgRouting developers
+Mail: project@pgrouting.org
+
+Function's developer: 
+Copyright (c) 2015 Celia Virginia Vergara Castillo
+Mail: vicky_vergara@hotmail.com
+
+------
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+********************************************************************PGR-GNU*/
+
+#ifndef INCLUDE_DRIVERS_COMPONENTS_BRIDGES_DRIVER_H_
+#define INCLUDE_DRIVERS_COMPONENTS_BRIDGES_DRIVER_H_
+#pragma once
+
+#include "c_types/pgr_edge_t.h"
+#include "c_types/pgr_components_rt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    /*********************************************************
+      TEXT,
+    BIGINT,
+    BIGINT,
+     ********************************************************/
+
+
+    void
+        do_pgr_bridges(
+                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);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // INCLUDE_DRIVERS_COMPONENTS_BRIDGES_DRIVER_H_

sql/components/CMakeLists.txt

@@ -4,6 +4,7 @@ SET(LOCAL_FILES
     strongComponentsV.sql
     biconnectedComponents.sql
     articulationPoints.sql
+    bridges.sql
     )
 
 # Do not modify bellow this line

sql/components/bridges.sql

@@ -0,0 +1,38 @@
+/*PGR-GNU*****************************************************************
+File: bridges.sql
+
+Generated with Template by:
+Copyright (c) 2016 pgRouting developers
+Mail: project@pgrouting.org
+
+Function's developer: 
+Copyright (c) 2017 Celia Virginia Vergara Castillo
+Mail: vicky_vergara@hotmail.com
+
+------
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+********************************************************************PGR-GNU*/
+
+CREATE OR REPLACE FUNCTION pgr_bridges(
+    TEXT,                       -- edges_sql
+        OUT seq INTEGER,        -- seq
+    OUT edge BIGINT)            -- the number of the edge 
+
+RETURNS SETOF RECORD AS
+'$libdir/${PGROUTING_LIBRARY_NAME}', 'bridges'
+LANGUAGE c IMMUTABLE STRICT;
+

src/components/src/CMakeLists.txt

@@ -3,8 +3,10 @@ ADD_LIBRARY(components OBJECT
 	strongComponentsV.c
 	biconnectedComponents.c
     articulationPoints.c
+    bridges.c
 
     connectedComponentsV_driver.cpp
 	strongComponentsV_driver.cpp
     biconnectedComponents_driver.cpp
-    articulationPoints_driver.cpp)
+    articulationPoints_driver.cpp
+    bridges_driver.cpp)

src/components/src/articulationPoints_driver.cpp

@@ -1,5 +1,5 @@
 /*PGR-GNU*****************************************************************
-File: connectedComponentsV_driver.cpp
+File: articulationPoints_driver.cpp
 
 Generated with Template by:
 Copyright (c) 2015 pgRouting developers