From a97160cf579d00b129fac2f3dd33ed54ff0808af Mon Sep 17 00:00:00 2001
From: LeonineKing1199 <christian.mazakas@gmail.com>
Date: Sat, 28 Aug 2021 16:09:13 -0700
Subject: [PATCH] Fix bug in `has_construct` by using `std::declval`

---
 include/boost/unordered/detail/implementation.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/unordered/detail/implementation.hpp b/include/boost/unordered/detail/implementation.hpp
index 9dffde15..5daf53ee 100644
--- a/include/boost/unordered/detail/implementation.hpp
+++ b/include/boost/unordered/detail/implementation.hpp
@@ -1145,7 +1145,7 @@ namespace boost {
       template <typename T, typename ValueType, typename... Args>
       BOOST_UNORDERED_HAS_FUNCTION(construct, U,
         (boost::unordered::detail::make<ValueType*>(),
-          boost::unordered::detail::make<Args const>()...),
+          std::declval<Args>()...),
         2);
 
 #else