JModuleCounter.hh

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#ifndef __JTRIGGER__JMODULECOUNTER__
#define __JTRIGGER__JMODULECOUNTER__

#include <vector>
#include <algorithm>


/**
 * \author mdejong
 */

namespace JTRIGGER {}
namespace JPP { using namespace JTRIGGER; }

namespace JTRIGGER {

  /**
   * Auxiliary class for counting unique modules.
   */
  struct JModuleCounter {
    /**
     * Default constructor.
     */
    JModuleCounter()
    {}


    /**
     * Count unique modules.
     *
     * The template parameter should correspond to a data type which provides for the following method:
     * <pre>
     *        int getModuleID();
     * </pre>
     * Note that the input data are not changed.
     *
     * \param  __begin       begin of data
     * \param  __end         end   of data
     * \return               number of unique modules
     */
    template<class T>
    int operator()(T __begin, T __end) const
    {
      using namespace std;

      buffer.resize(distance(__begin, __end));

      vector<int>::iterator out = buffer.begin();

      for (T i = __begin; i != __end; ++i, ++out) {
        *out = i->getModuleID();
      }

      sort(buffer.begin(), buffer.end());

      return distance(buffer.begin(), unique(buffer.begin(), buffer.end()));
    }

  private:
    mutable std::vector<int> buffer;
  };


  /**
   * Function object to count unique modules.
   */
  static const JModuleCounter getNumberOfModules;
}

#endif