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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Here is a gist showing a 3 level hierarchy using sml. https://gist.github.com/indiosmo/08ab24181770125d5a2448d27f6ae99f. Comparing the two, esp. when anything related to *hierarchical* state machines are involved, I strongly prefer HFSM2. Even when comparing the source code, I prefer HFSM2 https://github.com/andrew-gresyk/HFSM2/blob/master/include/hfsm2/machine.hpp to boost::sml https://github.com/boost-ext/sml/blob/master/include/boost/sml.hpp.
Here is a gist showing a 3 level hierarchy using sml. https://gist.github.com/indiosmo/08ab24181770125d5a2448d27f6ae99f. Comparing the two, esp. when anything related to *hierarchical* state machines are involved, I strongly prefer HFSM2. Even when comparing the source code, I prefer HFSM2 https://github.com/andrew-gresyk/HFSM2/blob/master/include/hfsm2/machine.hpp to boost::sml https://github.com/boost-ext/sml/blob/master/include/boost/sml.hpp.