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Subject: Re: [boost] [log] How to set/reset a channel-specific filter
From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2010-03-16 13:22:21

"Andrey Semashev" <andrey.semashev_at_[hidden]> wrote in message
>> If we go with method a), we'd need a way to enumerate all global
>> loggers.
> Not sure why would you need to enumerate loggers. You could simply specify
> all the channels in the filter, if their number is not very big.

Loggers are declared by thrird party code, so we have no idea about the
number of loggers.

> If it is, you can create your own function that accepts the channel name
> and then decides if it is enabled. This function can then be converted
> into a filter like this:
> bool is_channel_enabled(std::string const& chan_name);
> sink->set_filter(
> flt::attr< std::string >("Channel").satisfies(&is_channel_enabled)
> );

Ok, that will certainly work for us, but I'd consider this a (small) hack,
because we'd have to duplicate information that is presumably already
present in Boost.Log.

More precisely, we want to provide a utility function where you pass in a
logger and a severity and the function then modifies the global filter so
that all records comming from the specified logger with a severity below the
specified one will be discarded. Unless I'm missing something, this would
require us keeping a global list of all loggers that have a filter applied,

I assumed that somewhere Boost.Log keeps such a list anyway, so I'd rather
use that one than build our own.

Thanks & Regards,

Andreas Huber
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