spymaster.h

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/* Copyright 2017 Olly Betts
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see
 * <https://www.gnu.org/licenses/>.
 */
 
#ifndef XAPIAN_INCLUDED_SPYMASTER_H
#define XAPIAN_INCLUDED_SPYMASTER_H
 
#include <xapian/intrusive_ptr.h>
#include <xapian/matchspy.h>
 
#include <vector>
 
class SpyMaster {
    typedef Xapian::Internal::opt_intrusive_ptr<Xapian::MatchSpy> opt_ptr_spy;
 
    const std::vector<opt_ptr_spy>* spies;
 
  public:
    explicit SpyMaster(const std::vector<opt_ptr_spy>* spies_)
        : spies(spies_->empty() ? NULL : spies_)
    {}
 
    operator bool() const { return spies != NULL; }
 
    void operator()(const Xapian::Document& doc,
                    double weight) {
        if (spies != NULL) {
            for (auto spy : *spies) {
                (*spy)(doc, weight);
            }
        }
    }
};
 
#endif // XAPIAN_INCLUDED_SPYMASTER_H