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Wallaroo is a dependency injection library for C++. With wallaroo you can easily separate the object graph from the class implementation. You can create objects and wiring them using strings, so that you can load the "object graph" from a configuration file.
Wallaroo is an infinite precision constraint solving and optimization library for linear constraints over the rational numbers. It handles equalities (=), inequalities (<=, >=), strict inequalities (<, >), and disequalities (!=).