If your XML-RPC server supports the Introspection API, you can automatically generate C++ proxy classes for it. To generate a proxy class, type the following command and save the output to a file:
bash$ xml-rpc-api2cpp \
> http://xmlrpc-c.sourceforge.net/api/sample.php sample SampleProxy
This will generate a proxy class named SampleProxy containing wrappers for all the methods beginning with sample. You can edit this class in any fashion you'd like.