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rel_erl is a lightweight relational in-memory database for Erlang.
Features
1. Data rows are stored in the process dictionary.
2. Unique and referencial constraints are enforced.
3. There can be more than one index per table.
4. One-to-many joins are fast and easy.
Lightweight include files adding reflection capabilities to C++. Generates SQL queries and serialization routines. STL-style iterations over class members. Compile-time / run-time reflection. Based on templates and meta-programming.