From 0d96de11b21630b32ea20dd8b1b26377e077c469 Mon Sep 17 00:00:00 2001
From: arvidn <arvid@libtorrent.org>
Date: Sun, 20 Oct 2024 14:48:29 +0200
Subject: [PATCH] fix the stream operator of bitfield flags, to print hex

---
 include/libtorrent/flags.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/libtorrent/flags.hpp b/include/libtorrent/flags.hpp
index 3ba35c93f4b..c19fcd72aaa 100644
--- a/include/libtorrent/flags.hpp
+++ b/include/libtorrent/flags.hpp
@@ -11,7 +11,11 @@ see LICENSE file.
 #define TORRENT_FLAGS_HPP_INCLUDED
 
 #include <type_traits> // for enable_if
+
+#if TORRENT_USE_IOSTREAM
 #include <iosfwd>
+#include <iomanip>
+#endif
 
 namespace libtorrent {
 
@@ -105,7 +109,7 @@ struct bitfield_flag
 
 #if TORRENT_USE_IOSTREAM
 	friend std::ostream& operator<<(std::ostream& os, bitfield_flag val)
-	{ return os << static_cast<UnderlyingType>(val); }
+	{ return os << std::hex << std::uint64_t(static_cast<UnderlyingType>(val)); }
 #endif
 
 private: