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Fold expression version of select<> #171

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Fold expression version of select<> #171

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8 changes: 3 additions & 5 deletions include/ctre/evaluation.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -136,11 +136,9 @@ constexpr CTRE_FORCE_INLINE R evaluate(const Iterator begin, Iterator current, c
// matching select in patterns
template <typename R, typename Iterator, typename EndIterator, typename HeadOptions, typename... TailOptions, typename... Tail>
constexpr CTRE_FORCE_INLINE R evaluate(const Iterator begin, Iterator current, const EndIterator end, const flags & f, R captures, ctll::list<select<HeadOptions, TailOptions...>, Tail...>) noexcept {
if (auto r = evaluate(begin, current, end, f, captures, ctll::list<HeadOptions, Tail...>())) {
return r;
} else {
return evaluate(begin, current, end, f, captures, ctll::list<select<TailOptions...>, Tail...>());
}
R inner_result = evaluate(begin, current, end, f, captures, ctll::list<HeadOptions, Tail...>()); //first branch
((!inner_result && (inner_result = evaluate(begin, current, end, f, captures, ctll::list<TailOptions, Tail...>()))), ...); //all others
return inner_result;
}

template <typename R, typename Iterator, typename EndIterator, typename... Tail>
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