Index: lexical_cast.hpp
===================================================================
--- lexical_cast.hpp	(Revision 57771)
+++ lexical_cast.hpp	(Revision 57773)
@@ -7,6 +7,12 @@
 # pragma once
 #endif
 
+// Silence MS warnings like C4244: '+=' : conversion from 'int' to 'unsigned short', possible loss of data
+#if defined(_MSC_VER)
+#  pragma warning(push)
+#  pragma warning(disable:4244)
+#endif
+
 // Boost lexical_cast.hpp header  -------------------------------------------//
 //
 // See http://www.boost.org/libs/conversion for documentation.
@@ -2501,5 +2507,8 @@
 #undef BOOST_LCAST_THROW_BAD_CAST
 #undef BOOST_LCAST_NO_WCHAR_T
 
+#if defined(_MSC_VER)
+#  pragma warning(pop)
+#endif
+
 #endif // BOOST_LEXICAL_CAST_INCLUDED
-