count until predicate returns false

[Jonathan M Davis]

On Monday, August 15, 2011 12:53 Andrej Mitrovic wrote:
> This will print the count of whitespace chars in a line:
> 
> writeln(count!isWhite(line));
> 
> What I need is the count of whitspace chars until the first
> non-whitespace char is found, essentially I need a "countWhile"
> template:
> 
> writeln(countWhile!isWhite(line));
> 
> Can I do this with existing templates somehow?

writeln(count!(not!isWhite)(line));

- Jonathan M Davis