From 85ebe0a2ed35e84d026a1f4be4e925085a1a90a7 Mon Sep 17 00:00:00 2001
From: Andrzej Krzemienski <akrzemi1@gmail.com>
Date: Sun, 19 Jun 2022 23:57:15 +0200
Subject: [PATCH] fix hash spec for C++17

---
 include/boost/optional/detail/optional_hash.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/boost/optional/detail/optional_hash.hpp b/include/boost/optional/detail/optional_hash.hpp
index fad5ce0..234ee7b 100644
--- a/include/boost/optional/detail/optional_hash.hpp
+++ b/include/boost/optional/detail/optional_hash.hpp
@@ -24,7 +24,7 @@ namespace std
   template <typename T>
   struct hash<boost::optional<T> >
   {
-    typedef typename hash<T>::result_type result_type;
+    typedef std::size_t result_type;
     typedef boost::optional<T> argument_type;
 
     BOOST_CONSTEXPR result_type operator()(const argument_type& arg) const {
@@ -35,7 +35,7 @@ namespace std
   template <typename T>
   struct hash<boost::optional<T&> >
   {
-    typedef typename hash<T>::result_type result_type;
+    typedef std::size_t result_type;
     typedef boost::optional<T&> argument_type;
 
     BOOST_CONSTEXPR result_type operator()(const argument_type& arg) const {