From 9bc1cc585cf6876846b13a46837ff2a5735590b1 Mon Sep 17 00:00:00 2001
From: Andrzej Krzemienski <akrzemi1@gmail.com>
Date: Wed, 2 Nov 2016 22:28:20 +0100
Subject: [PATCH] small sfinae fix for in_place constructors

---
 include/boost/optional/optional.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/boost/optional/optional.hpp b/include/boost/optional/optional.hpp
index 871903a..844cb0f 100644
--- a/include/boost/optional/optional.hpp
+++ b/include/boost/optional/optional.hpp
@@ -727,7 +727,9 @@ class optional_base : public optional_tag
 template <typename U>
 struct is_optional_related
   : boost::conditional< boost::is_base_of<optional_detail::optional_tag, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
-                     || boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, none_t>::value,
+                     || boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, none_t>::value
+                     || boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, in_place_init_t>::value
+                     || boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, in_place_init_if_t>::value,
     boost::true_type, boost::false_type>::type
 {};