/home/palakars/workspace-inprogress/code-in-progress/aitools3/aitools3-aq-invertedindex-cpp/src/usage/index_searching.cpp

Go to the documentation of this file.

#include "index_searching.hpp"
#include "invertedindex.hpp"

namespace aitools {
namespace invertedindex {

void search_index(const bfs::path& index_dir)
{
        /* (1) Setup your configuration.
         */
        Configuration config;
        config.set_index_directory(index_dir.string());

        /* (2) Create an instance of IndexSearcher with the same entry type used
         * for building the index with the IndexBuilder.
         */
        IndexSearcher<IntFloat> searcher;

        try
        {
                /* (3) Initialize the index passing the configuration.
                 */
                searcher.init(config);

                /* (4) Search the index for a given key.
                 * There are three overloads for the IndexSearcher::search() method.
                 * The version without any parameter returns the entire postlist if any,
                 * the other versions allow just to load a part of the postlist.
                 */
                Postlist<IntFloat> postlist(searcher.search("2206"));
                postlist.info(std::cout); // prints some info data

                /* (5) Iterate the postlist.
                 * Use the Postlist::next() method to forward iterate the postlist.
                 * The function returns false if the end of the postlist is reached.
                 */
                IntFloat value;
                while (postlist.next(value))
                {
                        std::cout << value << std::endl;
                }
        }
        catch (const std::exception& error)
        {
                Logging::error(std::string(error.what()));
        }
}

} // namespace invertedindex
} // namespace aitools

---