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I have some live data that does not fit well into the object oriented paradigm. I am looking for a library in C++ that can store, index, and query this data with a relational database interface at runtime.

I do not want to interface with this library using std::string typed queries, much less SQL queries. Ideally the interface would be something closer to relational algebra, like relation_a * relation_b would be the cross product of two relations.

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  • Is it ok for you to spawn additional processes? Use the disk? What hardware? What OS? What license? What price? etc.
    – einpoklum
    Commented Aug 1, 2016 at 7:24
  • I would like free, same process, preferably OS-independent, entirely in memory.
    – Mark
    Commented Aug 1, 2016 at 18:57

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Not exactly what you asked for - since it is SQLish, but SQLite seems to have an in-process-memory mode, if I read this. Most in-memory DBs, however, live in separate processes rather than in a library.

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I think boost::multi_index was what I was looking for.

http://www.boost.org/doc/libs/1_52_0/libs/multi_index/doc/tutorial/index.html#rationale

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