Re: [boost] [log] How to derive from a logger

Subject: Re: [boost] [log] How to derive from a logger
From: Andreas Huber (ahd6974-spamboostorgtrap_at_[hidden])
Date: 2010-03-22 12:45:21

I guess I can answer my own question now: It's probably not a good idea, 
because of this function in the base class

    FinalT& operator= (FinalT that)
    {
        base_type::swap_unlocked(that);
        return static_cast< FinalT& >(*this);
    }

FinalT would in this case not point to the most-derived type, making this a 
very strange operator=.

My question now is: How do I derive my own logger that has its own data 
member(s) without having to duplicate ctors, etc. So far I've come up with 
this ...

class Logger : public ::boost::log::sources::basic_composite_logger<
    char, Logger, ::boost::log::sources::multi_thread_model< 
::boost::log::aux::light_rw_mutex >,
    typename ::boost::log::sources::features<
        ::boost::log::sources::severity< Severity >,
        ::boost::log::sources::channel< std::string > >::type >
{
    public:
        BOOST_LOG_FORWARD_LOGGER_CONSTRUCTORS(Logger)

        void SetMinimumSeverity(Severity severity);
        Severity GetMinimumSeverity();
        bool AllowRecord(Severity severity);

    private:
        volatile Severity minimumSeverity;
};

... but this of course leaves minimumSeverity uninitialized. I tried to 
implement default & copy ctor myself & use 
BOOST_LOG_PARAMETRIZED_CONSTRUCTORS_FORWARD, but that left me with strange 
errors.

Thanks,

--
Andreas Huber
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