scope file.open

[nobody]

Chris Nicholson-Sauls Wrote:

> nobody wrote:
> > Hallo,
> > 
> > how can i saftly open a file with scope.
> > My  idea is:
> > import std.stream;
> > import std.stdio;
> > 
> > void main() {
> >         File file = new File;
> > 
> >         scope(failure) {
> >                 writefln("Datei kann nicht geoeffnet werden ");
> >         }
> >         file.open("testdatei.txt",FileMode.In);
> > 
> >         while(!file.eof()) {
> >                 printf("%.*s\n",file.readLine());
> > 
> >         }
> >         file.close();
> > }
> > 
> > 
> > But why must scope(failure) before the file.open statement.
> > I think it's look strange.
> > Mybe some on have a better idea to open a file with scope.
> > 
> > Sincerily
> > 
> 
> Personally I don't think it really looks all that strange, but I'm odd like that.  :)  In 
> this case, if it worries you, you might try a traditional try-catch-finally instead.
> 
> # void main () {
> #   File file = new File ;
> #
> #   try {
> #     file.open("testdatei.txt",FileMode.In);
> #     while(!file.eof()) {
> #       printf("%.*s\n",file.readLine());
> #     }
> #   }
> #   catch (Exception x) {
> #     writefln("Datei kann nicht geoeffnet werden ");
> #     throw x;
> #   }
> #
> #   file.close();
> # }
> 
> -- Chris Nicholson-Sauls

The question is, how scope know it's a failure to open a file, before the file.open statement 
is executed.
That is i didn't understand.
For this reason, i will put the scope(failure) after the file.open statement.

Thanks