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immer
Postmodern immutable and persistent data structures for C++ — value semantics at scale (by arximboldi)
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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.
You need persistent data structures all the way down (Immer has a good set). I talk about it more in one of my earlier talks: https://www.youtube.com/watch?v=rxmgkbQrah0
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