The STX Expression Parser provides a C++ framework that can process user-specified expression strings containing program-specific variables. It can be integrated into applications to allow user-customized data selection and filtering. The expression strings are intuitive SQL-like WHERE clauses, and can contain arbitrarily complex arithmetic. At the same time, the parse tree evaluation speed is guaranteed to be fast enough to safely iterate over larger data sets. The framework uses the Boost.Spirit parser library combined with a versatile custom scalar value class.
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