Building an Intuition for Composition
summary
Explains how concrete C++ features let composition be explicit: uses std::accumulate/std::reduce and fold expressions to show folds and parallelism (demonstrates nonassociative minus giving -53 vs -23), builds a map‑merger word‑count monoid for distributed reduce, composes orderings with operator|, treats std::optional and std::future as functors, introduces bind/and_then for joins, shows coroutines for async and a static‑exceptions/expected style for error propagation, and argues exposing monoid/functor/monad APIs yields clearer, parallelizable code.
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