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- template<class T, class F>
- auto fmap(F f, List<T> lst) -> List<decltype(f(lst.front()))>
- {
- if (lst.isEmpty())
- return List<decltype(f(lst.front()))>();
- else
- return List<decltype(f(lst.front()))>(f(lst.front()), fmap(f, lst.pop_front()));
- }
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