• Andrej Mitrovic <andrej.mitrovich gmail.com> Aug 15 2011
• "Simen Kjaeraas" <simen.kjaras gmail.com> Aug 15 2011

Andrej Mitrovic <andrej.mitrovich gmail.com> writes:

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?

"Simen Kjaeraas" <simen.kjaras gmail.com> writes:

On Mon, 15 Aug 2011 21:53:11 +0200, Andrej Mitrovic  
<andrej.mitrovich gmail.com> 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?


There is std.algorithm.countUntil, which does what's basically
the opposite. Just negate your predicate, and presto's your uncle.

-- 
   Simen