JBind2nd.hh

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#ifndef __JTRIGGER__JBIND2ND__
#define __JTRIGGER__JBIND2ND__

#include <functional>

#include "JTrigger/JMatch.hh"


/**
 * \author mdejong
 */

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

namespace JTRIGGER {

  
  /**
   * Auxiliary class to convert binary JMatch operator and given hit to unary match operator.
   *
   * This class is equivalent to the STD binder2nd class but it uses references to the JMatch 
   * interface rather than copies of a derived class. 
   */
  template <class JHit_t>
  class JBinder2nd :
    public std::unary_function<JHit_t, bool>
  {
  public:
    /**
     * Constructor.
     *
     * \param  __match        match operator
     * \param  __second       second hit
     */
    JBinder2nd(const JMatch<JHit_t>& __match,
               const JHit_t&         __second) : 
      match (__match),
      second(__second) 
    {}


    /**
     * Unary match operator.
     * 
     * \param  first          first hit
     * \return                true if first and second hit match; else false
     */
    inline bool operator()(const JHit_t& first) const
    { 
      return match(first, second); 
    }


  protected:
    const JMatch<JHit_t>& match;
    const JHit_t&         second;
  };


  /**
   * Auxiliary method to create JBinder2nd object.
   *
   * \param  match          match operator
   * \param  second         second hit
   * \return                JBinder2nd
   */
  template <class JHit_t>
  inline JBinder2nd<JHit_t>
  JBind2nd(const JMatch<JHit_t>& match, const JHit_t& second)
  {
    return JBinder2nd<JHit_t>(match, second);
  }
}

#endif