feat():initial version

install/boost_1_75_0/include/boost/json/fwd.hpp

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+//
+// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
+//
+// 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)
+//
+// Official repository: https://github.com/boostorg/json
+//
+
+#ifndef BOOST_JSON_FWD_HPP
+#define BOOST_JSON_FWD_HPP
+
+#include <boost/json/detail/config.hpp>
+
+BOOST_JSON_NS_BEGIN
+
+// Forward declarations for value types
+
+#ifndef BOOST_JSON_DOCS
+
+class array;
+class object;
+class string;
+class value;
+
+class key_value_pair;
+class storage_ptr;
+
+#endif
+
+BOOST_JSON_NS_END
+
+#endif