Mastering State in Modern C++: Making It Explicit

Passing state as data in the functional core–imperative shell In an earlier post , we saw that the functional core – imperative shell pattern reduces complexity by centralizing state mutation in the shell, turning hidden state dependencies into explicit ones. The underlying idea is simple: keep state out of the business logic. But putting this into practice is not: how can the business logic still evolve state that lives elsewhere—and why does this make dependencies explicit? Without a clear mod