From 0aff3ba2ffd00d3bc605d468d70815731a7ec6b0 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Mon, 10 May 2021 08:06:19 -0400
Subject: parent_of_member: Make sign conversion explicit in OffsetOfImpl()

Previously these conversions were implicit and causing quite a few
warnings on clang.
---
 src/common/parent_of_member.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/common/parent_of_member.h b/src/common/parent_of_member.h
index e0f8ab5c8..58c70b0e7 100644
--- a/src/common/parent_of_member.h
+++ b/src/common/parent_of_member.h
@@ -109,7 +109,8 @@ struct OffsetOfCalculator {
             }
         }
 
-        return (next - start) * sizeof(MemberType) + Offset;
+        return static_cast<ptrdiff_t>(static_cast<size_t>(next - start) * sizeof(MemberType) +
+                                      Offset);
     }
 
     static constexpr std::ptrdiff_t OffsetOf(MemberType ParentType::*member) {
-- 
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