Added thirdparty: boost library

thirdparty/include/boost/describe/enum_to_string.hpp

@@ -0,0 +1,48 @@
+#ifndef BOOST_DESCRIBE_ENUM_TO_STRING_HPP_INCLUDED
+#define BOOST_DESCRIBE_ENUM_TO_STRING_HPP_INCLUDED
+
+// Copyright 2020, 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe/detail/config.hpp>
+
+#if defined(BOOST_DESCRIBE_CXX14)
+
+#include <boost/describe/enumerators.hpp>
+#include <boost/mp11/algorithm.hpp>
+
+#if defined(_MSC_VER) && _MSC_VER == 1900
+# pragma warning(push)
+# pragma warning(disable: 4100) // unreferenced formal parameter
+#endif
+
+namespace boost
+{
+namespace describe
+{
+
+template<class E, class De = describe_enumerators<E>>
+char const * enum_to_string( E e, char const* def ) noexcept
+{
+    char const * r = def;
+
+    mp11::mp_for_each<De>([&](auto D){
+
+        if( e == D.value ) r = D.name;
+
+    });
+
+    return r;
+}
+
+} // namespace describe
+} // namespace boost
+
+#if defined(_MSC_VER) && _MSC_VER == 1900
+# pragma warning(pop)
+#endif
+
+#endif // defined(BOOST_DESCRIBE_CXX14)
+
+#endif // #ifndef BOOST_DESCRIBE_ENUM_TO_STRING_HPP_INCLUDED