Deprecate C style declerations?

Thu Dec 21 14:04:58 PST 2006

Thomas Kuehne wrote:
> 
> Does anyone actually use the #line construct?

YES!

It's extremely handy whenever you're writing something that's generating 
D code, especially when you allow chunks of D code through to the 
output.  For example, I used it extensively while researching for DSP, 
and I plan on using it for Enki's codegen (when I get around to it).

A more concrete, if not contrived, example would be a PHP-style 
(pre)processor for D:

<html><body>
<?
     int value = toInt(url["value"]);
     auto result = Fibonacci(value);
?>
The Fibonacci sequence for <?=value?> is <?=result?>
</body></html>

This would emit code (presumably to be run like an applet), like so:

// output.d
echo("<html><body>
");
#line 3 source.dhp

     int value = toInt(url["value"]);
     auto result = Fibonacci(value);

echo("The Fibonacci sequence for ");
#line 5 source.dhp
echo(value);
echo(" is ");
#line 5 source.dhp
echo(result);
echo("
</body></html>");

This way, any errors in the <??> expressions can be tied back to the 
original source, should there be a compiler error.

-- 
- EricAnderton at yahoo