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The C++23 standard introduced a monadic interface for std::optional<T>.

- transform(f(T)->U)->std::optional<U>

only invoked when the source isn't empty

- and_then(f(T)->std::optional<U>)->std::optional<U>

only invoked when the source isn't empty

- or_else(f()->std::optional<T>)->std::optional<T>

only invoked when the source is empty

Compiler Explorer link: https://compiler-explorer.com/z/4dzc776Gq