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[QUOTE="James Kanze, post: 3086309"]
The standard Unix convention allows for more than one filename.
What I usually do is something like:

int
    main( int argc, char** argv )
    {
        Gabi::MultipleFileIStream   source( argv + 1, argv + argc ) ;
        process( source, std::cout ) ;
        return EXIT_SUCCESS ;
    }

(The MultipleFileIStream class is available at my site:
kanze.james.neuf.fr.  It's actually one of the rare classes
there which hasn't undergone much modification since I put it
there.)

Otherwise, the standard Unix idiom is:

int
    main( int argc, char** argv )
    {
        if ( argc <= 1 ) {
            process( std::cin, std::cout ) ;
        } else {
            for ( int i = 1 ; i < argc ; ++ i ) {
                std::ifstream   source( argv[ i ] ) ;
                if ( ! source ) {
                    std::cerr << argv[ 0 ] << ": cannot open "
                              << argv[ i ] << std::endl ;
                } else {
                    process( source, std::cout ) ;
                }
            }
        }
        return EXIT_SUCCESS ;
    }

(There's also a singleton class, ProgramStatus, at my site which
can be used to manage the exit status.  MultipleFileIStream is
in the IO subsystem, ProgramStatus in the Process subsystem.)
[/QUOTE]

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