From 4b1caad727677cd0d50ffdb180289ba7000d6165 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Wed, 19 Jan 2022 17:30:56 +0200
Subject: [PATCH] Avoid sign conversion warnings in error_code::value

---
 include/boost/system/detail/error_code.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/boost/system/detail/error_code.hpp b/include/boost/system/detail/error_code.hpp
index eaf4324..910a9af 100644
--- a/include/boost/system/detail/error_code.hpp
+++ b/include/boost/system/detail/error_code.hpp
@@ -188,7 +188,11 @@ public:
 #if defined(BOOST_SYSTEM_HAS_SYSTEM_ERROR)
 
             std::error_code const& ec = *reinterpret_cast<std::error_code const*>( d2_ );
-            return ec.value() + 1000 * static_cast<unsigned>( reinterpret_cast<boost::uintptr_t>( &ec.category() ) % 2097143 ); // 2^21-9, prime
+
+            unsigned cv = static_cast<unsigned>( ec.value() );
+            unsigned ch = static_cast<unsigned>( reinterpret_cast<boost::uintptr_t>( &ec.category() ) % 2097143 ); // 2^21-9, prime
+
+            return static_cast<int>( cv + 1000 * ch );
 #else
 
             return -1;