how to state boost_serialization_split_member for non-intrusive function definitions

in th开发者_如何学编程e tutorial it is explained how to split load and save functions, but the boost_serialization_split_member() declaration was inside the class.

How do you declare a class being split to two functions externally?

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The section of the docs labeled, "Splitting serialize into save/load" explains how to do this. Basically, you have two template functions, save and load, for the type in question, defined in the boost::serialization namespace. Then you use the BOOST_SERIALIZATION_SPLIT_FREE macro.