Changeset 1560:01707a8a4ca6 in lemon-0.x for demo/lp_maxflow_demo.cc

Timestamp:

07/15/05 18:01:55 (19 years ago)

Author:

athos

Branch:

default

Phase:

public

Convert:

svn:c9d7d8f5-90d6-0310-b91f-818b3a526b0e/lemon/trunk@2058

Message:

Some demo programs got some interface. Most progress with lp_maxflow_demo.cc, which also got documented.

File:

• demo/lp_maxflow_demo.cc (modified) (4 diffs)

demo/lp_maxflow_demo.cc

@@ +1 @@
+/* -*- C++ -*-
+ * demo/lp_maxflow_demo.cc - Part of LEMON, a generic C++ optimization library
+ *
+ * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+///\ingroup demos
+///\file
+///\brief Max flow problem solved with an LP solver (demo).
+///
+///This demo program shows how to solve a maximum (or maximal) flow
+///problem using the LEMON LP solver interface. We would like to lay
+///the emphasis on the simplicity of the way one can formulate the LP
+///constraints with LEMON that arise in graph theory.
+
 #ifdef HAVE_CONFIG_H
 #include <config.h>
@@ -5 +30 @@
 #include<lemon/graph_reader.h>
 #include<lemon/list_graph.h>
+
+#include <fstream>
+#include <iostream>
 
 
@@ -76 +104 @@
 }
 
-int main() 
+int main(int argc, char *argv[]) 
 {
+  if(argc<2)
+  {
+      std::cerr << "USAGE: lp_maxflow_demo <input_file.lgf>" << std::endl;
+      std::cerr << "The file 'input_file.lgf' has to contain a max flow instance in LEMON format (e.g. sample.lgf is such a file)." << std::endl;
+      return 0;
+  }
+
+
+  //input stream to read the graph from
+  std::ifstream is(argv[1]);
+
+
   ListGraph g;
   ListGraph::Node s;
@@ -84 +124 @@
   ListGraph::EdgeMap<double> cap(g);
   
-  GraphReader<ListGraph> reader(std::cin,g);
+  GraphReader<ListGraph> reader(is,g);
   reader.readNode("source",s).readNode("target",t)
     .readEdgeMap("capacity",cap).run();
   
-  // std::ifstream file("../test/preflow_");
-//   readDimacs(file, g, cap, s, t);
-
   std::cout << "Max flow value = " << maxFlow(g,cap,s,t) << std::endl;