try to prevent optimizer to remove null sink code altogether
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@ -17,7 +17,7 @@ template<typename Mutex>
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class null_sink : public base_sink<Mutex>
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{
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protected:
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void sink_it_(const details::log_msg &msg) override
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void sink_it_(const details::log_msg &) override
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{
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// prevent optimizer to remove this sink altogether (and do useful check while at it).
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if(this->level() == level::off)
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