From: Maxim Yegorushkin (e-maxim_at_[hidden])
Date: 2004-10-29 04:26:34
Daniel Frey <daniel.frey_at_[hidden]> wrote:
>> logger("app.gui") << "something GUIsh";
>> Though I am not sure, if a compiler will be able to optimize checks
>> for every operator<<() to a single check for the entire output
>> expression.
>
> Now replace "something GUIsh" with anExpensiveFunction(). John's code
> will not evaluate it when the logger is disabled. OTOH your code will
> always evaluate it, which is IMHO not acceptable for a logging library.
Well, that is true, though my logging needs has never required calling any
expensive functions.
-- Maxim Yegorushkin