How to get the serialise score returned in Xapian::KeyMaker->operator().

[张少华]

HI, all,

I am a user of Xapian, and now I have a problem in using it. 

After using boolean terms to get some candidates of documents (still too much), we want sorted them by self-defined function which is used in Xapian::KeyMaker->operator(). But how can I get the serialise score in Xapian::MSetIterator object.

c++ code likes this:

class SortKeyMaker : public Xapian::KeyMaker {
std::string operator()(const Xapian::Document& doc) const {
    double score = self-defined-function(doc);
    return Xapian::sortable_serialise(score);   // How get this value in Xapian::MSetIterator
}






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