scope file.open

[Frits van Bommel]

Chris Nicholson-Sauls wrote:
> nobody wrote:
>> Hallo,
>>
>> how can i saftly open a file with scope.
>> My  idea is:
[snip]
>> 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.
> 
> 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();
> # }

While you're at it, either
* put 'scope' in front of the 'File file' declaration, or
* move 'file.close()' into a finally{} block at the end of that 
try-catch, or
* put 'scope(exit) file.close();' right after the declaration of file

All of those will guarantee your file gets closed if an exception gets 
thrown. I'd personally prefer the first one, but if you're going to use 
try-catch anyway you might as well tack on a 'finally'.

Of course, it doesn't really matter in this case since it's directly in 
main(), and the exception will exit it...