/C++/Extra parameter in comparator function for sort

Extra parameter in comparator function for sort

class TopicSorter{
    Query query_;
public:
    TopicSorter(Query query){ query_ = query; }
    bool operator()(Topic t1, Topic t2) const {
    return compareTopics( t1 , t2 , query_);
    }
};

Source: varrunr.wordpress.com

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