Force instantiation of hash_combine to work around a problem that showed up in boost 1.62.0. Disable meangingless Visual Studio warnings.

Author: Dale Wilson

src/mfast/decimal_ref.cpp

@@ -14,9 +14,15 @@
 template class boost::multiprecision::backends::cpp_dec_float<18>;
 
 #if BOOST_VERSION >= 106200
+
 #include <boost/functional/hash.hpp>
 
+#if defined(_MSC_VER) 
+#pragma warning(disable: 4667)  //  no function template defined that matches forced instantiation
+#else
+// This doesn't work in MSVC, but apparently it isn't needed.
 template void boost::hash_combine<boost::multiprecision::backends::cpp_dec_float<18u, int, void>::enum_fpclass_type>(unsigned long&, boost::multiprecision::backends::cpp_dec_float<18u, int, void>::enum_fpclass_type const&);
+#endif
 template void boost::hash_combine<bool>(unsigned long&, bool const&);
 template void boost::hash_combine<int>(unsigned long&, int const&);
 template void boost::hash_combine<unsigned int>(unsigned long&, unsigned int const&);

src/mfast/field_instructions.h

@@ -8,6 +8,7 @@
 #ifdef _MSC_VER
 #pragma warning(disable : 4275) // non dll-interface class used as base for
                                 // dll-interface class
+#pragma warning(disable : 4996) // Microsoft deprecates C++ standard library.
 #endif                          //_MSC_VER
 
 #include "instructions/int_instructions.h"