SRP for Function Calls in C++
summary
Claims that std::packaged_task (in <future>) cleanly separates invoking work from retrieving results, shows a four-line pattern that reproduces std::async without its join-on-destruction behavior, and reveals the real pain: figuring the returned type and moving tasks because packaged_task is move-only. Demonstrates a task-composition library that returns futures from when_any/when_all-style combinators, works for building work trees, and highlights the missing shared/reenterable equivalent.
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