Create steem_fwd.hpp to forward-declare all custom serializers steemi…

…t#3118

libraries/chain/include/steem/chain/steem_fwd.hpp

@@ -0,0 +1,47 @@
+#pragma once
+
+// This header forward-declare spack/unpack and to/from variant functions for Steem types.
+// These declarations need to be as early as possible to prevent compiler errors.
+
+#include <chainbase/allocators.hpp>
+
+namespace chainbase {
+template< typename T >
+class oid;
+}
+
+namespace fc { namespace raw {
+
+template<typename Stream, typename T>
+inline void pack( Stream& s, const chainbase::oid<T>& id );
+template<typename Stream, typename T>
+inline void unpack( Stream& s, chainbase::oid<T>& id );
+
+template<typename Stream>
+inline void pack( Stream& s, const chainbase::shared_string& ss );
+template<typename Stream>
+inline void unpack( Stream& s, chainbase::shared_string& ss );
+
+template<typename Stream, typename E, typename A>
+void pack( Stream& s, const boost::interprocess::deque< E, A >& value );
+template<typename Stream, typename E, typename A>
+void unpack( Stream& s, boost::interprocess::deque< E, A >& value );
+
+template<typename Stream, typename K, typename V, typename C, typename A>
+void pack( Stream& s, const boost::interprocess::flat_map< K, V, C, A >& value );
+template<typename Stream, typename K, typename V, typename C, typename A>
+void unpack( Stream& s, boost::interprocess::flat_map< K, V, C, A >& value );
+
+/*
+template<typename Stream, typename K, typename V, typename C, typename A>
+void pack( Stream& s, const boost::interprocess::map< K, V, C, A >& value );
+template<typename Stream, typename K, typename V, typename C, typename A>
+void unpack( Stream& s, boost::interprocess::map< K, V, C, A >& value );
+
+template<typename Stream, typename E, typename C, typename A>
+void pack( Stream& s, const boost::interprocess::set< E, C, A >& value );
+template<typename Stream, typename E, typename C, typename A>
+void unpack( Stream& s, boost::interprocess::set< E, C, A >& value );
+*/
+
+} }