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From: John Torjo (john.lists_at_[hidden])
Date: 2004-10-29 05:01:03

>> There is an option for avoiding if() checks in client code at all. All
>> you have to do is to implement operator<< for logger class.
>> [...]
>> And then in client code:
>> 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.
Yes, that's what I want to avoid. Thanks Daniel.


John Torjo,    Contributing editor, C/C++ Users Journal
-- "Win32 GUI Generics" -- generics & GUI do mix, after all
-- v1.5 - tooltips at your fingertips (work for menus too!)
    + bitmap buttons (work for MessageBox too!)
    + tab dialogs, hyper links, lite html

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