From d066622da34d07499428f3092d896dfeb7456afa Mon Sep 17 00:00:00 2001
From: Andersama <anderson.john.alexander@gmail.com>
Date: Sun, 10 Jan 2021 04:19:09 -0800
Subject: [PATCH] use fold expression vs recursion for simple version of
 select<>

---
 include/ctre/evaluation.hpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/include/ctre/evaluation.hpp b/include/ctre/evaluation.hpp
index 6701c6fa..c0bdcf81 100644
--- a/include/ctre/evaluation.hpp
+++ b/include/ctre/evaluation.hpp
@@ -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>