Changeset - r193:65cba1032f90
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alpar (Alpar Juttner)
alpar@cs.elte.hu
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1 file changed with 16 insertions and 10 deletions:
demo/lgf_demo.cc
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demo/lgf_demo.cc
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17 17 
 */
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///\ingroup demos


			




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///\file


			




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///\brief Demonstrating graph input and output


			




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///


			




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/// This program gives an example of how to load a directed graph from


			




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/// an \ref lgf-format "LGF" file with the \ref lemon::DigraphReader


			




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/// "DigraphReader" class.


			




	
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/// This program gives an example of how to read and write a digraph


			




	
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/// and additional maps from/to a stream or a file using the 


			




	
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/// \ref lgf-format "LGF" format.


			




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///


			




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/// The \c "digraph.lgf" file:


			




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/// \include digraph.lgf


			




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///


			




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/// And the program which reads it:


			




	
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/// And the program which reads it and prints the digraph to the


			




	
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/// standard output:


			




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/// \include lgf_demo.cc


			




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#include <iostream>


			




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#include <lemon/smart_graph.h>


			




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#include <lemon/lgf_reader.h>


			




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#include <lemon/lgf_writer.h>


			




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using namespace lemon;


			




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int main() {


			




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  SmartDigraph g;


			




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  SmartDigraph::ArcMap<int> cap(g);


			




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  SmartDigraph::Node s, t;


			




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  digraphReader("digraph.lgf", g). // read the directed graph into g


			




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    arcMap("capacity", cap).       // read the 'capacity' arc map into cap


			




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    node("source", s).             // read 'source' node to s


			




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    node("target", t).             // read 'target' node to t


			




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    run();


			




	
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  try {


			




	
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    digraphReader("digraph.lgf", g). // read the directed graph into g


			




	
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      arcMap("capacity", cap).       // read the 'capacity' arc map into cap


			




	
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      node("source", s).             // read 'source' node to s


			




	
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      node("target", t).             // read 'target' node to t


			




	
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      run();


			




	
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  } catch (DataFormatError& error) { // check if there was any error


			




	
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    std::cerr << "Error: " << error.what() << std::endl;


			




	
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    return -1;


			




	
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  }


			




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  std::cout << "A digraph is read from 'digraph.lgf'." << std::endl;


			




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  std::cout << "Number of nodes: " << countNodes(g) << std::endl;


			




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  std::cout << "Number of arcs: " << countArcs(g) << std::endl;


			




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  std::cout << "We can write it to the standard output:" << std::endl;


			




        

    






    
    



    


    

     
    
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