[boost] Re: Logging Library -- Formal Review Request

From: John Eddy (johneddy_at_[hidden])
Date: 2005-04-25 18:33:10

John Torjo wrote:
> 
>>
>> Hi. If I understand right the code, even if log is disabled, I do pay 
>> for constructing
>> log messages. Am I right? If so why do you force this?
> 
> 
> No, you donot pay.
> 
> BOOST_LOG(app) << "testing " << i << '-' << j << '-' << k;
> 
> Is the equivalent of:
> 
> if ( is_log_enabled(app) ) app_log() << "testing" << i ...;
> 
> Best,
> John
> 
> 

Is it the case however that we'll have to pay the cost of evaluating
whatever arguments are supplied (for example if some of them are 
function calls etc.)?

As in:

BOOST_LOG(app) << "testing " << fctn() << '-' << j << '-' << k;

Will fctn() be called if !is_log_enabled(app)?

Thanks,
John