1.1 --- a/src/lemon/graph_writer.h	Fri Mar 11 16:44:20 2005 +0000
     1.2 +++ b/src/lemon/graph_writer.h	Fri Mar 11 18:54:18 2005 +0000
     1.3 @@ -18,6 +18,8 @@
     1.4  ///\file
     1.5  ///\brief Graph writer.
     1.6  
     1.7 +#ifndef LEMON_GRAPH_WRITER_H
     1.8 +#define LEMON_GRAPH_WRITER_H
     1.9  
    1.10  #include <iostream>
    1.11  #include <sstream>
    1.12 @@ -28,6 +30,7 @@
    1.13  #include <memory>
    1.14  
    1.15  #include <lemon/map_utils.h>
    1.16 +
    1.17  #include <lemon/invalid.h>
    1.18  #include <lemon/error.h>
    1.19  
    1.20 @@ -444,3 +447,5 @@
    1.21  
    1.22  
    1.23  }
    1.24 +
    1.25 +#endif