From 9d0acd519573caed5d4c6aceb937073e8bc38052 Mon Sep 17 00:00:00 2001
From: Joakim Tosteberg <joakim.tosteberg@zenterio.com>
Date: Wed, 4 Apr 2018 09:37:44 +0200
Subject: [PATCH] Use char type directly to avoid invalid aliasing in one more
 place

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

diff --git a/include/boost/function/function_template.hpp b/include/boost/function/function_template.hpp
index c6bbd2d..177b60a 100644
--- a/include/boost/function/function_template.hpp
+++ b/include/boost/function/function_template.hpp
@@ -904,7 +904,9 @@ namespace boost {
       if (!f.empty()) {
         this->vtable = f.vtable;
         if (this->has_trivial_copy_and_destroy())
-          this->functor = f.functor;
+          // Don't operate on storage directly since union type doesn't relax
+          // strict aliasing rules, despite of having member char type.
+          std::memcpy(this->functor.data, f.functor.data, sizeof(boost::detail::function::function_buffer));
         else
           get_vtable()->base.manager(f.functor, this->functor,
                                      boost::detail::function::clone_functor_tag);