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Utility/safe-file.h

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#ifndef NMWR_GB_SAFE_FILEIO_H
#define NMWR_GB_SAFE_FILEIO_H



// $LICENSE


#include <fstream.h>
#include "Forward/string_fwd.h"

//--------------------------------------------------------------
/*! 
   This class povides some functions to open and close
   files in a robust (?) manner.
   If a file with a given name does not exist,
   the user is prompted for a valid filename.
   Also, the class may search for a compressed file with a .gz suffix.

   The opened ifstream in will be returned, so that 
   the following usages are possible:

   \code
   ifstream in;
   file_interactive::open(in,"xyz.dat") >> x >> y >> z;
   \endcode

   or

   \code
   file_interactive::open_gz(in,"xyz.dat");
   in >> x >> y >> z;
   \endcode
   This tries to open "xyz.dat" or, failing this, "xyz.dat.gz".
*/ //--------------------------------------------------------------



class file_interactive {
public:
  enum { is_open,     
         is_open_gz , 
         insist,      
         no_insist,   
         failed       
       };

  static int open(std::ifstream& in,  std::string const& filename);


  static int open_gz(std::ifstream& in,  std::string const& filename, int strictness = insist);
  static void       close(std::ifstream& in, std::string const& nm, int gz = is_open);

  static int        open (std::ofstream& out, std::string const& filename);
    // FIXME: does not work for both gcc 2.95 and 3.0.1  
  //      std::ios_base::openmode mode = std::ios_base::out);



  static void       close(std::ofstream& in, std::string const& nm, int gz = is_open);
};

#endif

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Copyright (c) Guntram Berti 1997-2002. See the GrAL Homepage for up-to-date information.

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