Changes in / [193:65cba1032f90:192:7bf5f97d574f] in lemon

File:

• demo/lgf_demo.cc (modified) (2 diffs)

demo/lgf_demo.cc

@@ -21 +21 @@
 ///\brief Demonstrating graph input and output
 ///
-/// This program gives an example of how to read and write a digraph
-/// and additional maps from/to a stream or a file using the 
-/// \ref lgf-format "LGF" format.
+/// This program gives an example of how to load a directed graph from
+/// an \ref lgf-format "LGF" file with the \ref lemon::DigraphReader
+/// "DigraphReader" class.
 ///
 /// The \c "digraph.lgf" file:
 /// \include digraph.lgf
 ///
-/// And the program which reads it and prints the digraph to the
-/// standard output:
+/// And the program which reads it:
 /// \include lgf_demo.cc
 
@@ -43 +42 @@
   SmartDigraph::ArcMap<int> cap(g);
   SmartDigraph::Node s, t;
-  
-  try {
-    digraphReader("digraph.lgf", g). // read the directed graph into g
-      arcMap("capacity", cap).       // read the 'capacity' arc map into cap
-      node("source", s).             // read 'source' node to s
-      node("target", t).             // read 'target' node to t
-      run();
-  } catch (DataFormatError& error) { // check if there was any error
-    std::cerr << "Error: " << error.what() << std::endl;
-    return -1;
-  }
+
+  digraphReader("digraph.lgf", g). // read the directed graph into g
+    arcMap("capacity", cap).       // read the 'capacity' arc map into cap
+    node("source", s).             // read 'source' node to s
+    node("target", t).             // read 'target' node to t
+    run();
 
   std::cout << "A digraph is read from 'digraph.lgf'." << std::endl;