And Then() Some(T): C++ Combinators - Higher-Order Functions in Cpp
summary
Shows concrete C++ examples that turn string parse/trim/length and safe division into chained continuations so code never unwraps intermediate results and error cases carry context. Uses fmap style lifting for vector and optional pipelines, uses and_then / bind style chaining with optional/expected and demonstrates a parser returning optional<int> and a safe divide returning an error enum. Notes C++23 monadic extensions land unevenly so tl::optional and ntl::expected work as drop‑in replacements and the patterns compile and reduce boilerplate.
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