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immer
Postmodern immutable and persistent data structures for C++ — value semantics at scale (by arximboldi)
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libgit2
A cross-platform, linkable library implementation of Git that you can use in your application.
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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.
This is why if you look at libraries like Immer they are based around reference counting and shared ownership.
What? libgit absolutely exists. Or you could use low level commands, they have stable machine readable CLI interfaces.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.