added Space::serialize_to_string(StreamType & stream) template

src/space/space.h

@@ -501,6 +501,27 @@ public:
 	void remove(const std::wstring & field);
 
 
+	template<typename StreamType>
+	void serialize_to_string(StreamType & stream) const
+	{
+		if( type == type_wstring )
+		{
+			stream << value.value_wstring;
+		}
+		else
+		if( type == type_string )
+		{
+			stream << value.value_string;
+		}
+		else
+		{
+			serialize_to_json_stream(stream);
+		}
+	}
+
+
+
+
 	std::string  serialize_to_space_str(bool pretty_print = false) const;
 	std::wstring serialize_to_space_wstr(bool pretty_print = false) const;
 	void serialize_to_space_to(std::string & str, bool pretty_print = false) const;