How to handle boost::iostreams::gzip_decompressor() exceptions?

[tomjoad]

Hey all!
I'm trying to add a exception handling code in this function I made:

   void DecompressLogFile ( std::string source, std::string filename )
   {
      std::ifstream file( source.c_str(), std::ios_base::in | std::ios_base::binary ); //Creates the input stream

      //Tests if the file is being opened correctly.
      if ( !file )
      {
         std::cerr<< "Can't open file: " << source << std::endl;
         return;
      }

      std::ofstream out( filename.c_str(), std::ios_base::out |  std::ios_base::binary ); //Creates the output stream
      boost::iostreams::filtering_streambuf<boost::iostreams::input> in; //Sets the filters to be used in the input stream
      in.push( boost::iostreams::gzip_decompressor() ); //Decompress being used on the file in the input stream
      in.push( file );
      boost::iostreams::copy( in, out ); //Copy the decompressed file to the output stream
   }

To be more precise, I need to handle possible exceptions on this line:
...
in.push( boost::iostreams::gzip_decompressor() );
...

I looked everywhere for examples on how to do this but I can't find anywhere.
So if any of you guys can help me out on this one, code examples would be great too.

Thanks in advance.

[Galik]

You need to decide what you are going to do if the task fails. Will you pass an exception up to the caller? Or will you issue a log message? Or will you quietly ignore it? Or will you take alternative action?

[tomjoad]

Issue a log message, sorry!

[Galik]

Well you can simply catch the exception like this:

void DecompressLogFile ( std::string source, std::string filename )
{
      std::ifstream file( source.c_str(), std::ios_base::in | std::ios_base::binary ); //Creates the input stream

      //Tests if the file is being opened correctly.
      if ( !file )
      {
         std::cerr<< "Can't open file: " << source << std::endl;
         return;
      }

      try
      {
		  std::ofstream out( filename.c_str(), std::ios_base::out |  std::ios_base::binary ); //Creates the output stream
		  boost::iostreams::filtering_streambuf<boost::iostreams::input> in; //Sets the filters to be used in the input stream
		  in.push( boost::iostreams::gzip_decompressor() ); //Decompress being used on the file in the input stream
		  in.push( file );
		  boost::iostreams::copy( in, out ); //Copy the decompressed file to the output stream
      }
      catch(std::exception& e)
      {
    	  std::cerr << e.what() << std::endl;
      }
   }
}