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Struct Field Aggregation via std::apply and Tuples

Medium · template_metaprogramming · Quant Developer interview question · std-apply, std-tuple, fold-expressions, static-reflection, structured-bindings, c++17

High-performance trading systems require generic, compile-time operations on data structures like orders for serialization or validation. C++17 enables this by using std::tuple as a struct mirror, allowing algorithms to be applied across all fields via std::apply. This technique avoids runtime overhead and manual field enumeration, forming a basis for reflection-like patterns in modern C++. Task Implement two functions to perform a generic aggregation on an OrderFields struct. The first functio