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parallel-hashmap
A family of header-only, very fast and memory-friendly hashmap and btree containers.
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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.
There is an excellent btree implementation in my phmap library (header only)
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