Added thirdparty: boost library

thirdparty/include/boost/qvm/to_string.hpp

@@ -0,0 +1,46 @@
+#ifndef BOOST_QVM_TO_STRING_HPP_INCLUDED
+#define BOOST_QVM_TO_STRING_HPP_INCLUDED
+
+// Copyright 2008-2022 Emil Dotchevski and Reverge Studios, Inc.
+
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <string>
+
+#if __cplusplus >= 201103L
+
+namespace boost { namespace qvm {
+
+namespace
+qvm_to_string_detail
+    {
+    using std::to_string;
+    }
+
+} }
+
+#else
+
+#include <sstream>
+
+namespace boost { namespace qvm {
+
+namespace
+qvm_to_string_detail
+    {
+    template <class T>
+    std::string
+    to_string( T const & x )
+        {
+        std::stringstream s;
+        s << x;
+        return s.str();
+        }
+    }
+
+} }
+
+#endif
+
+#endif