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Tuple For-Each via std::apply and Fold Expressions

Medium · template_metaprogramming · Quant Developer interview question · std-apply, std-tuple, fold-expressions, variadic-lambda, c++17, tuple-iteration

In quantitative finance, market risk systems often require applying uniform transformations, like scaling by a risk factor, across heterogeneous data fields. C++17 template metaprogramming allows for a generic tuple_for_each utility, using std::apply and fold expressions to iterate over std::tuple elements at compile time. This avoids runtime overhead from virtual dispatch or type erasure while providing a powerful tool for struct-like data manipulation. Task Implement the function tuple_for_ea