Matthias Moulin 9d3dde0900 Made mutex member variable mutable ... Classes inheriting from `base_sink` can now lock the base mutex inside their `const` member methods (e.g., basic accessors).		2021-04-22 21:19:54 +02:00
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spdlog	Made mutex member variable mutable	2021-04-22 21:19:54 +02:00